parallel foreach - Page 75

Creating a multidimensional array

- by Jess McKenzie

I have the following response and I was wanting to know how can I turn it into an multidimensional array foreach item [0][1] etc Controller $rece Response: array(16) { ["digital_delivery"]=> int(1) ["original_referrer"]=> string(11) "No Referrer" ["shop_rule_us_state_code"]=> string(1) "0" ["subtotal_ex_vat"]=> string(4) "9.99" ["subtotal_inc_vat"]=> string(4) "9.99" ["tax_amount"]=> string(4) "0.00" ["delivery_price"]=> string(4) "0.00" ["discount_deduction"]=> string(4) "0.00" ["currency_code"]=> string(3) "GBP" ["total"]=> string(4) "9.99" ["paid"]=> int(1) ["created"]=> string(19) "2013-10-31 21:03:44" ["website_id"]=> string(2) "64" ["first_name"]=> string(3) "Joe" ["last_name"]=> string(5) "Blogs" ["email"]=> string(17) "[email protected]" } array(16) { ["digital_delivery"]=> int(1) ["original_referrer"]=> string(11) "No Referrer" ["shop_rule_us_state_code"]=> string(1) "0" ["subtotal_ex_vat"]=> string(4) "9.99" ["subtotal_inc_vat"]=> string(4) "9.99" ["tax_amount"]=> string(4) "0.00" ["delivery_price"]=> string(4) "0.00" ["discount_deduction"]=> string(4) "0.00" ["currency_code"]=> string(3) "GBP" ["total"]=> string(4) "9.99" ["paid"]=> int(1) ["created"]=> string(19) "2013-10-31 21:03:44" ["website_id"]=> string(2) "64" ["first_name"]=> string(3) "Joe" ["last_name"]=> string(5) "Blogs" ["email"]=> string(13) "[email protected]" } array(16) { ["digital_delivery"]=> int(1) ["original_referrer"]=> string(11) "No Referrer" ["shop_rule_us_state_code"]=> string(1) "0" ["subtotal_ex_vat"]=> string(4) "9.99" ["subtotal_inc_vat"]=> string(4) "9.99" ["tax_amount"]=> string(4) "0.00" ["delivery_price"]=> string(4) "0.00" ["discount_deduction"]=> string(4) "0.00" ["currency_code"]=> string(3) "GBP" ["total"]=> string(4) "9.99" ["paid"]=> int(1) ["created"]=> string(19) "2013-10-31 21:03:44" ["website_id"]=> string(2) "64" ["first_name"]=> string(3) "Joe" ["last_name"]=> string(5) "Blogs" ["email"]=> string(15) "[email protected]" } Controller: foreach ($this->receivers as $rece) { $order_data['first_name'] = $rece[0]; $order_data['last_name'] = $rece[1]; $order_data['email'] = $rece[2]; $order_id = $this->orders_model->add_order_multi($order_data, $order_products_data); $this-receivers function: public function parse_receivers($receivers) { $this->receivers = explode( "\n", trim($receivers) ); $this->receivers = array_filter($this->receivers, 'trim'); $validReceivers = false; foreach($this->receivers as $key=>$receiver) { $validReceivers = true; $this->receivers[$key] = array_map( 'trim', explode(',', $receiver) ); if (count($this->receivers[$key]) != 3) { $line = $key + 1; $this->form_validation->set_message('parse_receivers', "There is an error in the %s at line $line ($receiver)"); return false; } } return $validReceivers; }

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using Intellimouse in Parallels 5

- by nobody

I'm running Win7 in Parallels 5 and have a five button USB mouse (Microsoft Intellimouse). I have my mouse's side buttons mapped to the Forward and Back (browser) commands. However, Parallel's Mouse Synchronization Service seems to be intercepting the mouse keypress event for these two buttons, and remapping them to the Windows Start Menu command. Any way to undo this? i.e. get my Back/Forward buttons working again?

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Auto-Suggest via ‘Trie’ (Pre-fix Tree)

- by Strenium

Auto-Suggest (Auto-Complete) “thing” has been around for a few years. Here’s my little snippet on the subject. For one of my projects, I had to deal with a non-trivial set of items to be pulled via auto-suggest used by multiple concurrent users. Simple, dumb iteration through a list in local cache or back-end access didn’t quite cut it. Enter a nifty little structure, perfectly suited for storing and matching verbal data: “Trie” (http://tinyurl.com/db56g) also known as a Pre-fix Tree: “Unlike a binary search tree, no node in the tree stores the key associated with that node; instead, its position in the tree defines the key with which it is associated. All the descendants of a node have a common prefix of the string associated with that node, and the root is associated with the empty string. Values are normally not associated with every node, only with leaves and some inner nodes that correspond to keys of interest.” This is a very scalable, performing structure. Though, as usual, something ‘fast’ comes at a cost of ‘size’; fortunately RAM is more plentiful today so I can live with that. I won’t bore you with the detailed algorithmic performance here - Google can do a better job of such. So, here’s C# implementation of all this. Let’s start with individual node: Trie Node /// <summary> /// Contains datum of a single trie node. /// </summary> public class AutoSuggestTrieNode { public char Value { get; set; } /// <summary> /// Gets a value indicating whether this instance is leaf node. /// </summary> /// <value> /// <c>true</c> if this instance is leaf node; otherwise, a prefix node <c>false</c>. /// </value> public bool IsLeafNode { get; private set; } public List<AutoSuggestTrieNode> DescendantNodes { get; private set; } /// <summary> /// Initializes a new instance of the <see cref="AutoSuggestTrieNode"/> class. /// </summary> /// <param name="value">The phonetic value.</param> /// <param name="isLeafNode">if set to <c>true</c> [is leaf node].</param> public AutoSuggestTrieNode(char value = ' ', bool isLeafNode = false) { Value = value; IsLeafNode = isLeafNode; DescendantNodes = new List<AutoSuggestTrieNode>(); } /// <summary> /// Gets the descendants of the pre-fix node, if any. /// </summary> /// <param name="descendantValue">The descendant value.</param> /// <returns></returns> public AutoSuggestTrieNode GetDescendant(char descendantValue) { return DescendantNodes.FirstOrDefault(descendant => descendant.Value == descendantValue); } } Quite self-explanatory, imho. A node is either a “Pre-fix” or a “Leaf” node. “Leaf” contains the full “word”, while the “Pre-fix” nodes act as indices used for matching the results. Ok, now the Trie: Trie Structure /// <summary> /// Contains structure and functionality of an AutoSuggest Trie (Pre-fix Tree) /// </summary> public class AutoSuggestTrie { private readonly AutoSuggestTrieNode _root = new AutoSuggestTrieNode(); /// <summary> /// Adds the word to the trie by breaking it up to pre-fix nodes + leaf node. /// </summary> /// <param name="word">Phonetic value.</param> public void AddWord(string word) { var currentNode = _root; word = word.Trim().ToLower(); for (int i = 0; i < word.Length; i++) { var child = currentNode.GetDescendant(word[i]); if (child == null) /* this character hasn't yet been indexed in the trie */ { var newNode = new AutoSuggestTrieNode(word[i], word.Count() - 1 == i); currentNode.DescendantNodes.Add(newNode); currentNode = newNode; } else currentNode = child; /* this character is already indexed, move down the trie */ } } /// <summary> /// Gets the suggested matches. /// </summary> /// <param name="word">The phonetic search value.</param> /// <returns></returns> public List<string> GetSuggestedMatches(string word) { var currentNode = _root; word = word.Trim().ToLower(); var indexedNodesValues = new StringBuilder(); var resultBag = new ConcurrentBag<string>(); for (int i = 0; i < word.Trim().Length; i++) /* traverse the trie collecting closest indexed parent (parent can't be leaf, obviously) */ { var child = currentNode.GetDescendant(word[i]); if (child == null || word.Count() - 1 == i) break; /* done looking, the rest of the characters aren't indexed in the trie */ indexedNodesValues.Append(word[i]); currentNode = child; } Action<AutoSuggestTrieNode, string> collectAllMatches = null; collectAllMatches = (node, aggregatedValue) => /* traverse the trie collecting matching leafNodes (i.e. "full words") */ { if (node.IsLeafNode) /* full word */ resultBag.Add(aggregatedValue); /* thread-safe write */ Parallel.ForEach(node.DescendantNodes, descendandNode => /* asynchronous recursive traversal */ { collectAllMatches(descendandNode, String.Format("{0}{1}", aggregatedValue, descendandNode.Value)); }); }; collectAllMatches(currentNode, indexedNodesValues.ToString()); return resultBag.OrderBy(o => o).ToList(); } /// <summary> /// Gets the total words (leafs) in the trie. Recursive traversal. /// </summary> public int TotalWords { get { int runningCount = 0; Action<AutoSuggestTrieNode> traverseAllDecendants = null; traverseAllDecendants = n => { runningCount += n.DescendantNodes.Count(o => o.IsLeafNode); n.DescendantNodes.ForEach(traverseAllDecendants); }; traverseAllDecendants(this._root); return runningCount; } } } Matching operations and Inserts involve traversing the nodes before the right “spot” is found. Inserts need be synchronous since ordering of data matters here. However, matching can be done in parallel traversal using recursion (line 64). Here’s sample usage: [TestMethod] public void AutoSuggestTest() { var autoSuggestCache = new AutoSuggestTrie(); var testInput = @"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer nec odio. Praesent libero. Sed cursus ante dapibus diam. Sed nisi. Nulla quis sem at nibh elementum imperdiet. Duis sagittis ipsum. Praesent mauris. Fusce nec tellus sed augue semper porta. Mauris massa. Vestibulum lacinia arcu eget nulla. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Curabitur sodales ligula in libero. Sed dignissim lacinia nunc. Curabitur tortor. Pellentesque nibh. Aenean quam. In scelerisque sem at dolor. Maecenas mattis. Sed convallis tristique sem. Proin ut ligula vel nunc egestas porttitor. Morbi lectus risus, iaculis vel, suscipit quis, luctus non, massa. Fusce ac turpis quis ligula lacinia aliquet. Mauris ipsum. Nulla metus metus, ullamcorper vel, tincidunt sed, euismod in, nibh. Quisque volutpat condimentum velit. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Nam nec ante. Sed lacinia, urna non tincidunt mattis, tortor neque adipiscing diam, a cursus ipsum ante quis turpis. Nulla facilisi. Ut fringilla. Suspendisse potenti. Nunc feugiat mi a tellus consequat imperdiet. Vestibulum sapien. Proin quam. Etiam ultrices. Suspendisse in justo eu magna luctus suscipit. Sed lectus. Integer euismod lacus luctus magna. Quisque cursus, metus vitae pharetra auctor, sem massa mattis sem, at interdum magna augue eget diam. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Morbi lacinia molestie dui. Praesent blandit dolor. Sed non quam. In vel mi sit amet augue congue elementum. Morbi in ipsum sit amet pede facilisis laoreet. Donec lacus nunc, viverra nec."; testInput.Split(' ').ToList().ForEach(word => autoSuggestCache.AddWord(word)); var testMatches = autoSuggestCache.GetSuggestedMatches("le"); } ..and the result: That’s it!

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Day 6 - Game Menuing Woes and Future Screen Sneak Peeks

- by dapostolov

So, after my last post on Day 5 I dabbled with my game class design. I took the approach where each game objects is tightly coupled with a graphic. The good news is I got the menu working but not without some hard knocks and game growing pains. I'll explain later, but for now...here is a class diagram of my first stab at my class structure and some code... Ok, there are few mistakes, however, I'm going to leave it as is for now... As you can see I created an inital abstract base class called GameSprite. This class when inherited will provide a simple virtual default draw method: public virtual void DrawSprite(SpriteBatch spriteBatch) { spriteBatch.Draw(Sprite, Position, Color.White); } The benefits of coding it this way allows me to inherit the class and utilise the method in the screen draw method...So regardless of what the graphic object type is it will now have the ability to render a static image on the screen. Example: public class MyStaticTreasureChest : GameSprite {} If you remember the window draw method from Day 3's post, we could use the above code as follows... protected override void Draw(GameTime gameTime) { GraphicsDevice.Clear(Color.CornflowerBlue); spriteBatch.Begin(SpriteBlendMode.AlphaBlend); foreach(var gameSprite in ListOfGameObjects) { gameSprite.DrawSprite(spriteBatch); } spriteBatch.End(); base.Draw(gameTime); } I have to admit the GameSprite object is pretty plain as with its DrawSprite method... But ... we now have the ability to render 3 static menu items on the screen ... BORING! I want those menu items to do something exciting, which of course involves animation... So, let's have a peek at AnimatedGameSprite in the above game diagram. The idea with the AnimatedGameSprite is that it has an image to animate...such as ... characters, fireballs, and... menus! So after inheriting from GameSprite class, I added a few more options such as UpdateSprite... public virtual void UpdateSprite(float elapsed) { _totalElapsed += elapsed; if (_totalElapsed > _timePerFrame) { _frame++; _frame = _frame % _framecount; _totalElapsed -= _timePerFrame; } } And an overidden DrawSprite... public override void DrawSprite(SpriteBatch spriteBatch) { int FrameWidth = Sprite.Width / _framecount; Rectangle sourcerect = new Rectangle(FrameWidth * _frame, 0, FrameWidth, Sprite.Height); spriteBatch.Draw(Sprite, Position, sourcerect, Color.White, _rotation, _origin, _scale, SpriteEffects.None, _depth); } With these two methods...I can animate and image, all I had to do was add a few more lines to the screens Update Method (From Day 3), like such: float elapsed = (float) gameTime.ElapsedGameTime.TotalSeconds; foreach (var item in ListOfAnimatedGameObjects) { item.UpdateSprite(elapsed); } And voila! My images begin to animate in one spot, on the screen... Hmm, but how do I interact with the menu items using a mouse...well the mouse cursor was easy enough... this.IsMouseVisible = true; But, to have it "interact" with an image was a bit more tricky...I had to perform collision detection! mouseStateCurrent = Mouse.GetState(); var uiEnabledSprites = (from s in menuItems where s.IsEnabled select s).ToList(); foreach (var item in uiEnabledSprites) { var r = new Rectangle((int)item.Position.X, (int)item.Position.Y, item.Sprite.Width, item.Sprite.Height); item.MenuState = MenuState.Normal; if (r.Intersects(new Rectangle(mouseStateCurrent.X, mouseStateCurrent.Y, 0, 0))) { item.MenuState = MenuState.Hover; if (mouseStatePrevious.LeftButton == ButtonState.Pressed && mouseStateCurrent.LeftButton == ButtonState.Released) { item.MenuState = MenuState.Pressed; } } } mouseStatePrevious = mouseStateCurrent; So, basically, what it is doing above is iterating through all my interactive objects and detecting a rectangle collision and the object , plays the state animation (or static image). Lessons Learned, Time Burned... So, I think I did well to start, but after I hammered out my prototype...well...things got sloppy and I began to realise some design flaws... At the time: I couldn't seem to figure out how to open another window, such as the character creation screen Input was not event based and it was bugging me My menu design relied heavily on mouse input and I couldn't use keyboard. Mouse input, is tightly bound with graphic rendering / positioning, so its logic will have to be in each scene. Menu animations would stop mid frame, then continue when the action occured again. This is bad, because...what if I had a sword sliding onthe screen? Then it would slide a quarter of the way, then stop due to another action, then render again mid-slide... it just looked sloppy. Menu, Solved!? To solve the above problems I did a little research and I found some great code in the XNA forums. The one worth mentioning was the GameStateManagementSample. With this sample, you can create a basic "text based" menu system which allows you to swap screens, popup screens, play the game, and quit....basic game state management... In my next post I'm going to dwelve a bit more into this code and adapt it with my code from this prototype. Text based menus just won't cut it for me, for now...however, I'm still going to stick with my animated menu item idea. A sneak peek using the Game State Management Sample...with no changes made... Cool Things to Mention: At work ... I tend to break out in random conversations every-so-often and I get talking about some of my challenges with this game (or some stupid observation about something... stupid) During one conversation I was discussing how I should animate my images; I explained that I knew I had to use the Update method provided, but I didn't know how (at the time) to render an image at an appropriate "pace" and how many frames to use, etc.. I also got thinking that if a machine rendered my images faster / slower, that was surely going to f-up my animations. To which a friend, Sheldon, answered, surely the Draw method is like a camera taking a snapshot of a scene in time. Then it clicked...I understood the big picture of the game engine... After some research I discovered that the Draw method attempts to keep a framerate of 60 fps. From what I understand, the game engine will even leave out a few calls to the draw method if it begins to slow down. This is why we want to put our sprite updates in the update method. Then using a game timer (provided by the engine), we want to render the scene based on real time passed, not framerate. So even the engine renders at 20 fps, the animations will still animate at the same real time speed! Which brings up another point. Why 60 fps? I'm speculating that Microsoft capped it because LCD's dont' refresh faster than 60 fps? On another note, If the game engine knows its falling behind in rendering...then surely we can harness this to speed up our games. Maybe I can find some flag which tell me if the game is lagging, and what the current framerate is, etc...(instead of coding it like I did last time) Sheldon, suggested maybe I can render like WoW does, in prioritised layers...I think he's onto something, however I don't think I'll have that many graphics to worry about such a problem of graphic latency. We'll see. People to Mention: Well,as you are aware I hadn't posted in a couple days and I was surprised to see a few emails and messenger queries about my game progress (and some concern as to why I stopped). I want to thank everyone for their kind words of support and put everyone at ease by stating that I do intend on completing this project. Granted I only have a few hours each night, but, I'll do it. Thank you to Garth for mailing in my next screen! That was a nice surprise! The Sneek Peek you've been waiting for... Garth has also volunteered to render me some wizard images. He was a bit shocked when I asked for them in 2D animated strips. He said I was going backward (and that I have really bad Game Development Lingo). But, I advised Garth that I will use 3D images later...for now...2D images. Garth also had some great game design ideas to add on. I advised him that I will save his ideas and include them in the future design document (for the 3d version?). Lastly, my best friend Alek, is going to join me in developing this game. This was a project we started eons ago but never completed because of our careers. Now, priorities change and we have some spare time on our hands. Let's see what trouble Alek and I can get into! Tonight I'll be uploading my prototypes and base game to a source control for both of us to work off of. D.

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Automatically create bug resolution task using the TFS 2010 API

- by Bob Hardister

My customer requires bug resolution to be approved and tracked. To minimize the overhead for developers I implemented a TFS 2010 server-side plug-in to automatically create a child resolution task for the bug when the “CCB” field is set to approved. The CCB field is a custom field. I also added the story points field to the bug WIT for sizing purposes. Redundant tasks will not be created unless the bug title is changed or the prior task is closed. The program writes an audit trail to a log file visible in the TFS Admin Console Log view. Here’s the code. BugAutoTask.cs /* SPECIFICATION * When the CCB field on the bug is set to approved, create a child task where the task: * name = Resolve bug [ID] - [Title of bug] * assigned to = same as assigned to field on the bug * same area path * same iteration path * activity = Bug Resolution * original estimate = bug points * * The source code is used to build a dll (Ows.TeamFoundation.BugAutoTaskCreation.PlugIns.dll), * which needs to be copied to * C:\Program Files\Microsoft Team Foundation Server 2010\Application Tier\Web Services\bin\Plugins * on ALL TFS application-tier servers. * * Author: Bob Hardister. */ using System; using System.Collections.Generic; using System.IO; using System.Xml; using System.Text; using System.Diagnostics; using System.Linq; using Microsoft.TeamFoundation.Common; using Microsoft.TeamFoundation.Framework.Server; using Microsoft.TeamFoundation.WorkItemTracking.Client; using Microsoft.TeamFoundation.WorkItemTracking.Server; using Microsoft.TeamFoundation.Client; using System.Collections; namespace BugAutoTaskCreation { public class BugAutoTask : ISubscriber { public EventNotificationStatus ProcessEvent(TeamFoundationRequestContext requestContext, NotificationType notificationType, object notificationEventArgs, out int statusCode, out string statusMessage, out ExceptionPropertyCollection properties) { statusCode = 0; properties = null; statusMessage = String.Empty; // Error message for for tracing last code executed and optional fields string lastStep = "No field values found or set "; try { if ((notificationType == NotificationType.Notification) && (notificationEventArgs.GetType() == typeof(WorkItemChangedEvent))) { WorkItemChangedEvent workItemChange = (WorkItemChangedEvent)notificationEventArgs; // see ConnectToTFS() method below to select which TFS instance/collection // to connect to TfsTeamProjectCollection tfs = ConnectToTFS(); WorkItemStore wiStore = tfs.GetService<WorkItemStore>(); lastStep = lastStep + ": connection to TFS successful "; // Get the work item that was just changed by the user. WorkItem witem = wiStore.GetWorkItem(workItemChange.CoreFields.IntegerFields[0].NewValue); lastStep = lastStep + ": retrieved changed work item, ID:" + witem.Id + " "; // Filter for Bug work items only if (witem.Type.Name == "Bug") { // DEBUG lastStep = lastStep + ": changed work item is a bug "; // Filter for CCB (i.e. Baseline Status) field set to approved only bool BaselineStatusChange = false; if (workItemChange.ChangedFields != null) { ProcessBugRevision(ref lastStep, workItemChange, wiStore, ref witem, ref BaselineStatusChange); } } } } catch (Exception e) { Trace.WriteLine(e.Message); Logger log = new Logger(); log.WriteLineToLog(MsgLevel.Error, "Application error: " + lastStep + " - " + e.Message + " - " + e.InnerException); } statusCode = 1; statusMessage = "Bug Auto Task Evaluation Completed"; properties = null; return EventNotificationStatus.ActionApproved; } // PRIVATE METHODS private static void ProcessBugRevision(ref string lastStep, WorkItemChangedEvent workItemChange, WorkItemStore wiStore, ref WorkItem witem, ref bool BaselineStatusChange) { foreach (StringField field in workItemChange.ChangedFields.StringFields) { // DEBUG lastStep = lastStep + ": last changed field is - " + field.Name + " "; if (field.Name == "Baseline Status") { lastStep = lastStep + ": retrieved bug baseline status field value, bug ID:" + witem.Id + " "; BaselineStatusChange = (field.NewValue != field.OldValue); if ((BaselineStatusChange) && (field.NewValue == "Approved")) { // Instanciate logger Logger log = new Logger(); // *** Create resolution task for this bug *** // ******************************************* // Get the team project and selected field values of the bug work item Project teamProject = witem.Project; int bugID = witem.Id; string bugTitle = witem.Fields["System.Title"].Value.ToString(); string bugAssignedTo = witem.Fields["System.AssignedTo"].Value.ToString(); string bugAreaPath = witem.Fields["System.AreaPath"].Value.ToString(); string bugIterationPath = witem.Fields["System.IterationPath"].Value.ToString(); string bugChangedBy = witem.Fields["System.ChangedBy"].OriginalValue.ToString(); string bugTeamProject = witem.Project.Name; lastStep = lastStep + ": all mandatory bug field values found "; // Optional fields Field bugPoints = witem.Fields["Microsoft.VSTS.Scheduling.StoryPoints"]; if (bugPoints.Value != null) { lastStep = lastStep + ": all mandatory and optional bug field values found "; } // Initialize child resolution task title string childTaskTitle = "Resolve bug " + bugID + " - " + bugTitle; // At this point I can check if a resolution task (of the same name) // for the bug already exist // If so, do not create a new resolution task bool createResolutionTask = true; WorkItem parentBug = wiStore.GetWorkItem(bugID); WorkItemLinkCollection links = parentBug.WorkItemLinks; foreach (WorkItemLink wil in links) { if (wil.LinkTypeEnd.Name == "Child") { WorkItem childTask = wiStore.GetWorkItem(wil.TargetId); if ((childTask.Title == childTaskTitle) && (childTask.State != "Closed")) { createResolutionTask = false; log.WriteLineToLog(MsgLevel.Info, "Team project " + bugTeamProject + ": " + bugChangedBy + " - set the CCB field to \"Approved\" for bug, ID: " + bugID + ". Task not created as open one of the same name already exist, ID:" + childTask.Id); } } } if (createResolutionTask) { // Define the work item type of the new work item WorkItemTypeCollection workItemTypes = wiStore.Projects[teamProject.Name].WorkItemTypes; WorkItemType wiType = workItemTypes["Task"]; // Setup the new task and assign field values witem = new WorkItem(wiType); witem.Fields["System.Title"].Value = "Resolve bug " + bugID + " - " + bugTitle; witem.Fields["System.AssignedTo"].Value = bugAssignedTo; witem.Fields["System.AreaPath"].Value = bugAreaPath; witem.Fields["System.IterationPath"].Value = bugIterationPath; witem.Fields["Microsoft.VSTS.Common.Activity"].Value = "Bug Resolution"; lastStep = lastStep + ": all mandatory task field values set "; // Optional fields if (bugPoints.Value != null) { witem.Fields["Microsoft.VSTS.Scheduling.OriginalEstimate"].Value = bugPoints.Value; lastStep = lastStep + ": all mandatory and optional task field values set "; } // Check for validation errors before saving the new task and linking it to the bug ArrayList validationErrors = witem.Validate(); if (validationErrors.Count == 0) { witem.Save(); // Link the new task (child) to the bug (parent) var linkType = wiStore.WorkItemLinkTypes[CoreLinkTypeReferenceNames.Hierarchy]; // Fetch the work items to be linked var parentWorkItem = wiStore.GetWorkItem(bugID); int taskID = witem.Id; var childWorkItem = wiStore.GetWorkItem(taskID); // Add a new link to the parent relating the child and save it parentWorkItem.Links.Add(new WorkItemLink(linkType.ForwardEnd, childWorkItem.Id)); parentWorkItem.Save(); log.WriteLineToLog(MsgLevel.Info, "Team project " + bugTeamProject + ": " + bugChangedBy + " - set the CCB field to \"Approved\" for bug, ID:" + bugID + ", which automatically created child resolution task, ID:" + taskID); } else { log.WriteLineToLog(MsgLevel.Error, "Error in creating bug resolution child task for bug ID:" + bugID); foreach (Field taskField in validationErrors) { log.WriteLineToLog(MsgLevel.Error, " - Validation Error in task field: " + taskField.ReferenceName); } } } } } } } private TfsTeamProjectCollection ConnectToTFS() { // Connect to TFS string tfsUri = string.Empty; // Production TFS instance production collection tfsUri = @"xxxx"; // Production TFS instance admin collection //tfsUri = @"xxxxx"; // Local TFS testing instance default collection //tfsUri = @"xxxxx"; TfsTeamProjectCollection tfs = new TfsTeamProjectCollection(new System.Uri(tfsUri)); tfs.EnsureAuthenticated(); return tfs; } // HELPERS public string Name { get { return "Bug Auto Task Creation Event Handler"; } } public SubscriberPriority Priority { get { return SubscriberPriority.Normal; } } public enum MsgLevel { Info, Warning, Error }; public Type[] SubscribedTypes() { return new Type[1] { typeof(WorkItemChangedEvent) }; } } } Logger.cs using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Text; using System.Windows.Forms; namespace BugAutoTaskCreation { class Logger { // fields private string _ApplicationDirectory = @"C:\ProgramData\Microsoft\Team Foundation\Server Configuration\Logs"; private string _LogFileName = @"\CFG_ACCT_AT_OWS_BugAutoTaskCreation.log"; private string _LogFile; private string _LogTimestamp = DateTime.Now.ToString("MM/dd/yyyy HH:mm:ss"); private string _MsgLevelText = string.Empty; // default constructor public Logger() { // check for a prior log file FileInfo logFile = new FileInfo(_ApplicationDirectory + _LogFileName); if (!logFile.Exists) { CreateNewLogFile(ref logFile); } } // properties public string ApplicationDirectory { get { return _ApplicationDirectory; } set { _ApplicationDirectory = value; } } public string LogFile { get { _LogFile = _ApplicationDirectory + _LogFileName; return _LogFile; } set { _LogFile = value; } } // PUBLIC METHODS public void WriteLineToLog(BugAutoTask.MsgLevel msgLevel, string logRecord) { try { // set msgLevel text if (msgLevel == BugAutoTask.MsgLevel.Info) { _MsgLevelText = "[Info @" + MsgTimeStamp() + "] "; } else if (msgLevel == BugAutoTask.MsgLevel.Warning) { _MsgLevelText = "[Warning @" + MsgTimeStamp() + "] "; } else if (msgLevel == BugAutoTask.MsgLevel.Error) { _MsgLevelText = "[Error @" + MsgTimeStamp() + "] "; } else { _MsgLevelText = "[Error: unsupported message level @" + MsgTimeStamp() + "] "; } // write a line to the log file StreamWriter logFile = new StreamWriter(_ApplicationDirectory + _LogFileName, true); logFile.WriteLine(_MsgLevelText + logRecord); logFile.Close(); } catch (Exception) { throw; } } // PRIVATE METHODS private void CreateNewLogFile(ref FileInfo logFile) { try { string logFilePath = logFile.FullName; // write the log file header _MsgLevelText = "[Info @" + MsgTimeStamp() + "] "; string cpu = string.Empty; if (Environment.Is64BitOperatingSystem) { cpu = " (x64)"; } StreamWriter newLog = new StreamWriter(logFilePath, false); newLog.Flush(); newLog.WriteLine(_MsgLevelText + "===================================================================="); newLog.WriteLine(_MsgLevelText + "Team Foundation Server Administration Log"); newLog.WriteLine(_MsgLevelText + "Version : " + "1.0.0 Author: Bob Hardister"); newLog.WriteLine(_MsgLevelText + "DateTime : " + _LogTimestamp); newLog.WriteLine(_MsgLevelText + "Type : " + "OWS Custom TFS API Plug-in"); newLog.WriteLine(_MsgLevelText + "Activity : " + "Bug Auto Task Creation for CCB Approved Bugs"); newLog.WriteLine(_MsgLevelText + "Area : " + "Build Explorer"); newLog.WriteLine(_MsgLevelText + "Assembly : " + "Ows.TeamFoundation.BugAutoTaskCreation.PlugIns.dll"); newLog.WriteLine(_MsgLevelText + "Location : " + @"C:\Program Files\Microsoft Team Foundation Server 2010\Application Tier\Web Services\bin\Plugins"); newLog.WriteLine(_MsgLevelText + "User : " + Environment.UserDomainName + @"\" + Environment.UserName); newLog.WriteLine(_MsgLevelText + "Machine : " + Environment.MachineName); newLog.WriteLine(_MsgLevelText + "System : " + Environment.OSVersion + cpu); newLog.WriteLine(_MsgLevelText + "===================================================================="); newLog.WriteLine(_MsgLevelText); newLog.Close(); } catch (Exception) { throw; } } private string MsgTimeStamp() { string msgTimestamp = string.Empty; return msgTimestamp = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:fff"); } } }

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Stumbling Through: Visual Studio 2010 (Part III)

The last post ended with us just getting started on stumbling into text template file customization, a task that required a Visual Studio extension (Tangible T4 Editor) to even have a chance at completing. Despite the benefits of the Tangible T4 Editor, I still had a hard time putting together a solid text template that would be easy to explain. This is mostly due to the way the files allow you to mix code (encapsulated in <# #>) with straight-up text to generate. It is effective to be sure, but not very readable. Nevertheless, I will try and explain what was accomplished in my custom tt file, though the details of which are not really the point of this article (my way of saying dont criticize my crappy code, and certainly dont use it in any somewhat real application. You may become dumber just by looking at this code. You have been warned really the footnote I should put at the end of all of my blog posts). To begin with, there were two basic requirements that I needed the code generator to satisfy: Reading one to many entity framework files, and using the entities that were found to write one to many class files. Thankfully, using the Entity Object Generator as a starting point gave us an example on how to do exactly that by using the MetadataLoader and EntityFrameworkTemplateFileManager you include references to these items and use them like so: // Instantiate an entity framework file reader and file writer MetadataLoader loader = new MetadataLoader(this); EntityFrameworkTemplateFileManager fileManager = EntityFrameworkTemplateFileManager.Create(this); // Load the entity model metadata workspace MetadataWorkspace metadataWorkspace = null; bool allMetadataLoaded =loader.TryLoadAllMetadata("MFL.tt", out metadataWorkspace); EdmItemCollection ItemCollection = (EdmItemCollection)metadataWorkspace.GetItemCollection(DataSpace.CSpace); // Create an IO class to contain the 'get' methods for all entities in the model fileManager.StartNewFile("MFL.IO.gen.cs"); Next, we want to be able to loop through all of the entities found in the model, and then each property for each entity so we can generate classes and methods for each. The code for that is blissfully simple: // Iterate through each entity in the model foreach (EntityType entity in ItemCollection.GetItems<EntityType>().OrderBy(e => e.Name)) { // Iterate through each primitive property of the entity foreach (EdmProperty edmProperty in entity.Properties.Where(p => p.TypeUsage.EdmType is PrimitiveType && p.DeclaringType == entity)) { // TODO: Create properties } // Iterate through each relationship of the entity foreach (NavigationProperty navProperty in entity.NavigationProperties.Where(np => np.DeclaringType == entity)) { // TODO: Create associations } } There really isnt anything more advanced than that going on in the text template the only thing I had to blunder through was realizing that if you want the generator to interpret a line of code (such as our iterations above), you need to enclose the code in <# and #> while if you want the generator to interpret the VALUE of code, such as putting the entity name into the class name, you need to enclose the code in <#= and #> like so: public partial class <#=entity.Name#> To make a long story short, I did a lot of repetition of the above to come up with a text template that generates a class for each entity based on its properties, and a set of IO methods for each entity based on its relationships. The two work together to provide lazy-loading for hierarchical data (such getting Team.Players) so it should be pretty intuitive to use on a front-end. This text template is available here you can tweak the inputFiles array to load one or many different edmx models and generate the basic xml IO and class files, though it will probably only work correctly in the simplest of cases, like our MFL model described in the previous post. Additionally, there is no validation, logging or error handling which is something I want to handle later by stumbling through the enterprise library 5.0. The code that gets generated isnt anything special, though using the LINQ to XML feature was something very new and exciting for me I had only worked with XML in the past using the DOM or XML Reader objects along with XPath, and the LINQ to XML model is just so much more elegant and supposedly efficient (something to test later). For example, the following code was generated to create a Player object for each Player node in the XML: return from element in GetXmlData(_PlayerDataFile).Descendants("Player") select new Player { Id = int.Parse(element.Attribute("Id").Value) ,ParentName = element.Parent.Name.LocalName ,ParentId = long.Parse(element.Parent.Attribute("Id").Value) ,Name = element.Attribute("Name").Value ,PositionId = int.Parse(element.Attribute("PositionId").Value) }; It is all done in one line of code, no looping needed. Even though GetXmlData loads the entire xml file just like the old XML DOM approach would have, it is supposed to be much less resource intensive. I will definitely put that to the test after we develop a user interface for getting at this data. Speaking of the data where IS the data? Weve put together a pretty model and a bunch of code around it, but we dont have any data to speak of. We can certainly drop to our favorite XML editor and crank out some data, but if it doesnt totally match our model, it will not load correctly. To help with this, Ive built in a method to generate xml at any given layer in the hierarchy. So for us to get the closest possible thing to real data, wed need to invoke MFL.IO.GenerateTeamXML and save the results to file. Doing so should get us something that looks like this: <Team Id="0" Name="0"> <Player Id="0" Name="0" PositionId="0"> <Statistic Id="0" PassYards="0" RushYards="0" Year="0" /> </Player> </Team> Sadly, it is missing the Positions node (havent thought of a way to generate lookup xml yet) and the data itself isnt quite realistic (well, as realistic as MFL data can be anyway). Lets manually remedy that for now to give us a decent starter set of data. Note that this is TWO xml files Lookups.xml and Teams.xml: <Lookups Id=0> <Position Id="0" Name="Quarterback"/> <Position Id="1" Name="Runningback"/> </Lookups> <Teams Id=0> <Team Id="0" Name="Chicago"> <Player Id="0" Name="QB Bears" PositionId="0"> <Statistic Id="0" PassYards="4000" RushYards="120" Year="2008" /> <Statistic Id="1" PassYards="4200" RushYards="180" Year="2009" /> </Player> <Player Id="1" Name="RB Bears" PositionId="1"> <Statistic Id="2" PassYards="0" RushYards="800" Year="2007" /> <Statistic Id="3" PassYards="0" RushYards="1200" Year="2008" /> <Statistic Id="4" PassYards="3" RushYards="1450" Year="2009" /> </Player> </Team> </Teams> Ok, so we have some data, we have a way to read/write that data and we have a friendly way of representing that data. Now, what remains is the part that I have been looking forward to the most: present the data to the user and give them the ability to add/update/delete, and doing so in a way that is very intuitive (easy) from a development standpoint.Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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Stumbling Through: Visual Studio 2010 (Part III)

The last post ended with us just getting started on stumbling into text template file customization, a task that required a Visual Studio extension (Tangible T4 Editor) to even have a chance at completing. Despite the benefits of the Tangible T4 Editor, I still had a hard time putting together a solid text template that would be easy to explain. This is mostly due to the way the files allow you to mix code (encapsulated in <# #>) with straight-up text to generate. It is effective to be sure, but not very readable. Nevertheless, I will try and explain what was accomplished in my custom tt file, though the details of which are not really the point of this article (my way of saying dont criticize my crappy code, and certainly dont use it in any somewhat real application. You may become dumber just by looking at this code. You have been warned really the footnote I should put at the end of all of my blog posts). To begin with, there were two basic requirements that I needed the code generator to satisfy: Reading one to many entity framework files, and using the entities that were found to write one to many class files. Thankfully, using the Entity Object Generator as a starting point gave us an example on how to do exactly that by using the MetadataLoader and EntityFrameworkTemplateFileManager you include references to these items and use them like so: // Instantiate an entity framework file reader and file writer MetadataLoader loader = new MetadataLoader(this); EntityFrameworkTemplateFileManager fileManager = EntityFrameworkTemplateFileManager.Create(this); // Load the entity model metadata workspace MetadataWorkspace metadataWorkspace = null; bool allMetadataLoaded =loader.TryLoadAllMetadata("MFL.tt", out metadataWorkspace); EdmItemCollection ItemCollection = (EdmItemCollection)metadataWorkspace.GetItemCollection(DataSpace.CSpace); // Create an IO class to contain the 'get' methods for all entities in the model fileManager.StartNewFile("MFL.IO.gen.cs"); Next, we want to be able to loop through all of the entities found in the model, and then each property for each entity so we can generate classes and methods for each. The code for that is blissfully simple: // Iterate through each entity in the model foreach (EntityType entity in ItemCollection.GetItems<EntityType>().OrderBy(e => e.Name)) { // Iterate through each primitive property of the entity foreach (EdmProperty edmProperty in entity.Properties.Where(p => p.TypeUsage.EdmType is PrimitiveType && p.DeclaringType == entity)) { // TODO: Create properties } // Iterate through each relationship of the entity foreach (NavigationProperty navProperty in entity.NavigationProperties.Where(np => np.DeclaringType == entity)) { // TODO: Create associations } } There really isnt anything more advanced than that going on in the text template the only thing I had to blunder through was realizing that if you want the generator to interpret a line of code (such as our iterations above), you need to enclose the code in <# and #> while if you want the generator to interpret the VALUE of code, such as putting the entity name into the class name, you need to enclose the code in <#= and #> like so: public partial class <#=entity.Name#> To make a long story short, I did a lot of repetition of the above to come up with a text template that generates a class for each entity based on its properties, and a set of IO methods for each entity based on its relationships. The two work together to provide lazy-loading for hierarchical data (such getting Team.Players) so it should be pretty intuitive to use on a front-end. This text template is available here you can tweak the inputFiles array to load one or many different edmx models and generate the basic xml IO and class files, though it will probably only work correctly in the simplest of cases, like our MFL model described in the previous post. Additionally, there is no validation, logging or error handling which is something I want to handle later by stumbling through the enterprise library 5.0. The code that gets generated isnt anything special, though using the LINQ to XML feature was something very new and exciting for me I had only worked with XML in the past using the DOM or XML Reader objects along with XPath, and the LINQ to XML model is just so much more elegant and supposedly efficient (something to test later). For example, the following code was generated to create a Player object for each Player node in the XML: return from element in GetXmlData(_PlayerDataFile).Descendants("Player") select new Player { Id = int.Parse(element.Attribute("Id").Value) ,ParentName = element.Parent.Name.LocalName ,ParentId = long.Parse(element.Parent.Attribute("Id").Value) ,Name = element.Attribute("Name").Value ,PositionId = int.Parse(element.Attribute("PositionId").Value) }; It is all done in one line of code, no looping needed. Even though GetXmlData loads the entire xml file just like the old XML DOM approach would have, it is supposed to be much less resource intensive. I will definitely put that to the test after we develop a user interface for getting at this data. Speaking of the data where IS the data? Weve put together a pretty model and a bunch of code around it, but we dont have any data to speak of. We can certainly drop to our favorite XML editor and crank out some data, but if it doesnt totally match our model, it will not load correctly. To help with this, Ive built in a method to generate xml at any given layer in the hierarchy. So for us to get the closest possible thing to real data, wed need to invoke MFL.IO.GenerateTeamXML and save the results to file. Doing so should get us something that looks like this: <Team Id="0" Name="0"> <Player Id="0" Name="0" PositionId="0"> <Statistic Id="0" PassYards="0" RushYards="0" Year="0" /> </Player> </Team> Sadly, it is missing the Positions node (havent thought of a way to generate lookup xml yet) and the data itself isnt quite realistic (well, as realistic as MFL data can be anyway). Lets manually remedy that for now to give us a decent starter set of data. Note that this is TWO xml files Lookups.xml and Teams.xml: <Lookups Id=0> <Position Id="0" Name="Quarterback"/> <Position Id="1" Name="Runningback"/> </Lookups> <Teams Id=0> <Team Id="0" Name="Chicago"> <Player Id="0" Name="QB Bears" PositionId="0"> <Statistic Id="0" PassYards="4000" RushYards="120" Year="2008" /> <Statistic Id="1" PassYards="4200" RushYards="180" Year="2009" /> </Player> <Player Id="1" Name="RB Bears" PositionId="1"> <Statistic Id="2" PassYards="0" RushYards="800" Year="2007" /> <Statistic Id="3" PassYards="0" RushYards="1200" Year="2008" /> <Statistic Id="4" PassYards="3" RushYards="1450" Year="2009" /> </Player> </Team> </Teams> Ok, so we have some data, we have a way to read/write that data and we have a friendly way of representing that data. Now, what remains is the part that I have been looking forward to the most: present the data to the user and give them the ability to add/update/delete, and doing so in a way that is very intuitive (easy) from a development standpoint.Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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Building Visual Studio Setup Projects with TFS 2010 Team Build

- by Jakob Ehn

One of the most common complaints from people starting to use Team Build is that is doesn’t support building Microsoft’s own Setup and Deployment project (*.vdproj). When creating a default build definition that compiles a solution containing a setup project, you’ll get the following warning: The project file "MyProject.vdproj" is not supported by MSBuild and cannot be built. This is what the problem is all about. MSBuild, that is used for compiling your projects, does not understand the proprietary vdproj format defined by Microsoft quite some time ago. Unfortunately there is no sign that this will change in the near future, in fact the setup projects has barely changed at all since they were introduced. VS 2010 brings no new features or improvements hen it comes to the setup projects. VS 2010 does include a limited version of InstallShield which promises to be more MSBuild friendly and with more or less the same features as VS setup projects. I hope to get a closer look at this installer project type soon. But, how do we go about to build a Visual Studio setup project and produce an MSI as part of a Team Build process? Well, since only one application known to man understands the vdproj projects, we will have to installa copy of Visual Studio on the build server. Sad but true. After doing this, we use the Visual Studio command line interface (devenv) to perform the build. In this post I will show how to do this by using the InvokeProcess activity directly in a build workflow template. You’ll want to run build your setup projects after you have successfully compiled the projects. Install Visual Studio 2010 on the build server(s) Open your build process template /remember to branch or copy the xaml file before modifying it!) Locate the Try to Compile the Project activity Drop an instance of the InvokeProcess activity from the toolbox onto the designer, after the Run MSBuild for Project activity Drop an instance of the WriteBuildMessage activity inside the Handle Standard Output section. Set the Importance property to Microsoft.TeamFoundation.Build.Client.BuildMessageImportance.High (NB: This is necessary if you want the output from devenv to show up in the build log when running the build with the default verbosity) Set the Message property to stdOutput Drop an instance of the WriteBuildError activity to the Handle Error Output section Set the Message property to errOutput Select the InvokeProcess activity and set the values of the parameters to: The finished workflow should look like this: This will generate the MSI files, but they won’t be copied to the drop location. This is because we are using devenv and not MSBuild, so we have to do this explicitly Drop a Sequence activity somewhere after the Copy to Drop location activity. Create a variable in the Sequence activity of type IEnumerable<String> and call it GeneratedInstallers Drop a FindMatchingFiles activity in the sequence activity and set the properties to: Drop a ForEach<String> activity after the FindMatchingFiles activity. Set the Value property to GeneratedInstallers Drop an InvokeProcess activity inside the ForEach activity. FileName: “xcopy.exe” Arguments: String.Format("""{0}"" ""{1}""", item, BuildDetail.DropLocation) The Sequence activity should look like this: Save the build process template and check it in. Run the build and verify that the MSI’s is built and copied to the drop location. Note 1: One of the drawback of using devenv like this in a team build is that since all the output from the default compilations is placed in the Binaries folder, the outputs is not avaialable when devenv is invoked, which causes the whole solution to rebuild again. In TFS 2008, this was pretty simple to fix by using the CustomizableOutDir property. In TFS 2010, the same feature is not avaialble. Jim Lamb blogged about this recently, have a look at it if you have a problem with this: http://blogs.msdn.com/jimlamb/archive/2010/04/13/customizableoutdir-in-tfs-2010.aspx Note 2: Although the above solution works, a better approach is to wrap this in a custom activity that you can use in your builds. I will come back to this in a future post.

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Parallelism in .NET – Part 16, Creating Tasks via a TaskFactory

- by Reed

The Task class in the Task Parallel Library supplies a large set of features. However, when creating the task, and assigning it to a TaskScheduler, and starting the Task, there are quite a few steps involved. This gets even more cumbersome when multiple tasks are involved. Each task must be constructed, duplicating any options required, then started individually, potentially on a specific scheduler. At first glance, this makes the new Task class seem like more work than ThreadPool.QueueUserWorkItem in .NET 3.5. In order to simplify this process, and make Tasks simple to use in simple cases, without sacrificing their power and flexibility, the Task Parallel Library added a new class: TaskFactory. The TaskFactory class is intended to “Provide support for creating and scheduling Task objects.” Its entire purpose is to simplify development when working with Task instances. The Task class provides access to the default TaskFactory via the Task.Factory static property. By default, TaskFactory uses the default TaskScheduler to schedule tasks on a ThreadPool thread. By using Task.Factory, we can automatically create and start a task in a single “fire and forget” manner, similar to how we did with ThreadPool.QueueUserWorkItem: Task.Factory.StartNew(() => this.ExecuteBackgroundWork(myData) ); .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } This provides us with the same level of simplicity we had with ThreadPool.QueueUserWorkItem, but even more power. For example, we can now easily wait on the task: // Start our task on a background thread var task = Task.Factory.StartNew(() => this.ExecuteBackgroundWork(myData) ); // Do other work on the main thread, // while the task above executes in the background this.ExecuteWorkSynchronously(); // Wait for the background task to finish task.Wait(); TaskFactory simplifies creation and startup of simple background tasks dramatically. In addition to using the default TaskFactory, it’s often useful to construct a custom TaskFactory. The TaskFactory class includes an entire set of constructors which allow you to specify the default configuration for every Task instance created by that factory. This is particularly useful when using a custom TaskScheduler. For example, look at the sample code for starting a task on the UI thread in Part 15: // Given the following, constructed on the UI thread // TaskScheduler uiScheduler = TaskScheduler.FromCurrentSynchronizationContext(); // When inside a background task, we can do string status = GetUpdatedStatus(); (new Task(() => { statusLabel.Text = status; })) .Start(uiScheduler); This is actually quite a bit more complicated than necessary. When we create the uiScheduler instance, we can use that to construct a TaskFactory that will automatically schedule tasks on the UI thread. To do that, we’d create the following on our main thread, prior to constructing our background tasks: // Construct a task scheduler from the current SynchronizationContext (UI thread) var uiScheduler = TaskScheduler.FromCurrentSynchronizationContext(); // Construct a new TaskFactory using our UI scheduler var uiTaskFactory = new TaskFactory(uiScheduler); If we do this, when we’re on a background thread, we can use this new TaskFactory to marshal a Task back onto the UI thread. Our previous code simplifies to: // When inside a background task, we can do string status = GetUpdatedStatus(); // Update our UI uiTaskFactory.StartNew( () => statusLabel.Text = status); Notice how much simpler this becomes! By taking advantage of the convenience provided by a custom TaskFactory, we can now marshal to set data on the UI thread in a single, clear line of code!

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Reading Excel using ClosedXML

I have used closedXML api to read the excel. Here is how you do it. Statistically, this performs better than OpenXML. public DataTable ReadDataFromExcelUsingClosedXML() { string filePath ="@c:/temp/example.xlsx"; var LobjWorkbook = new XLWorkbook(filePath); var LobjWorksheet = LobjWorkbook.Worksheets.First(); var LobjFullRange = LobjWorksheet.RangeUsed(); var LobjUsedRange = LobjWorksheet.Range(MobjImportMapper.HeaderRowIndex + 1, 1, LobjFullRange.RangeAddress.LastAddress.RowNumber, LobjFullRange.RangeAddress.LastAddress.ColumnNumber); var LiNumberOfcolumnsInTheExcel = LobjUsedRange.ColumnCount(); // for progress bar int LiAggregateRowCounter = MobjImportMapper.HeaderRowIndex; int LiTotalNumberOfRows = LobjWorksheet.RowCount() - LiAggregateRowCounter; int LiPercentage = 0; foreach (var LobjRow in LobjUsedRange.RowsUsed()) { int LiTemp = 0; object[] LobjrowData = new object[LiNumberOfcolumnsInTheExcel + 1]; LobjrowData[LiTemp] = LobjRow.RangeAddress.FirstAddress.RowNumber; LiTemp++; LobjRow.Cells().ForEach(PobjCell => LobjrowData[LiTemp++] = PobjCell.Value); LdtExcelData.Rows.Add(LobjrowData); // for progress bar LiPercentage = ((100 * LiAggregateRowCounter / LiTotalNumberOfRows) / 4) * 3; if (LiPercentage > 5) PobjBackgoundWorker.ReportProgress(LiPercentage); LiAggregateRowCounter++; // ===================== } return LdtExcelData; } span.fullpost {display:none;}

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Implementing Release Notes in TFS Team Build 2010

- by Jakob Ehn

In TFS Team Build (all versions), each build is associated with changesets and work items. To determine which changesets that should be associated with the current build, Team Build finds the label of the “Last Good Build” an then aggregates all changesets up unitl the label for the current build. Basically this means that if your build is failing, every changeset that is checked in will be accumulated in this list until the build is successful. All well, but there uis a dimension missing here, regarding to releases. Often you can run several release builds until you actually deploy the result of the build to a test or production system. When you do this, wouldn’t it be nice to be able to send the customer a nice release note that contain all work items and changeset since the previously deployed version? At our company, we have developed a Release Repository, which basically is a siple web site with a SQL database as storage. Every time we run a Release Build, the resulting installers, zip-files, sql scripts etc, gets pushed into the release repositor together with the relevant build information. This information contains things such as start time, who triggered the build etc. Also, it contains the associated changesets and work items. When deploying the MSI’s for a new version, we mark the build as Deployed in the release repository. The depoyed status is stored in the release repository database, but it could also have been implemented by setting the Build Quality for that build to Deployed. When generating the release notes, the web site simple runs through each release build back to the previous build that was marked as Deplyed, and aggregates the work items and changesets: Here is a sample screenshot on how this looks for a sample build/application The web site is available both for us and also for the customers and testers, which means that they can easily get the latest version of a particular application and at the same time see what changes are included in this version. There is a lot going on in the Release Build Process that drives this in our TFS 2010 server, but in this post I will show how you can access and read the changeset and work item information in a custom activity. Since Team Build associates changesets and work items for each build, this information is (partially) available inside the build process template. The Associate Changesets and Work Items for non-Shelveset Builds activity (located inside the Try Compile, Test, and Associate Changesets and Work Items activity) defines and populates a variable called associatedWorkItems You can see that this variable is an IList containing instances of the Changeset class (from the Microsoft.TeamFoundation.VersionControl.Client namespace). Now, if you want to access this variable later on in the build process template, you need to declare a new variable in the corresponding scope and the assign the value to this variable. In this sample, I declared a variable called assocChangesets in the RunAgent sequence, which basically covers the whol compile, test and drop part of the build process: Now, you need to assign the value from the AssociatedChangesets to this variable. This is done using the Assign workflow activity: Now you can add a custom activity any where inside the RunAgent sequence and use this variable. NB: Of course your activity must place somewhere after the variable has been poplated. To finish off, here is code snippet that shows how you can read the changeset and work item information from the variable. First you add an InArgumet on your activity where you can pass i the variable that we defined. [RequiredArgument] public InArgument<IList<Changeset>> AssociatedChangesets { get; set; } Then you can traverse all the changesets in the list, and for each changeset use the WorkItems property to get the work items that were associated in that changeset: foreach (Changeset ch in associatedChangesets) { // Add change theChangesets.Add( new AssociatedChangeset(ch.ChangesetId, ch.ArtifactUri, ch.Committer, ch.Comment, ch.ChangesetId)); foreach (var wi in ch.WorkItems) { theWorkItems.Add( new AssociatedWorkItem(wi["System.AssignedTo"].ToString(), wi.Id, wi["System.State"].ToString(), wi.Title, wi.Type.Name, wi.Id, wi.Uri)); } } NB: AssociatedChangeset and AssociatedWorkItem are custom classes that we use internally for storing this information that is eventually pushed to the release repository.

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How do you create a cbuffer or global variable that is gpu modifiable?

- by bobobobo

I'm implementing tonemapping in a pixel shader, for hdr lighting. The vertex shader outputs vertices with colors. I need to find the max color and save it in a global. However when I try and write the global in my hlsl code, //clamp the max color below by this color clamp( maxColor, output.color, float4( 1e6,1e6,1e6,1e6 ) ) ; I see: error X3025: global variables are implicitly constant, enable compatibility mode to allow modification What is the correct way to declare a shader global in d3d11 that the vertex shader can write to, and the pixel shader can read? I realize this is a bit tough since the vertex shaders are supposed to run in parallel, and introducing a shader global that they all write to means a lock..

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Code snippets for ASP.NET MVC2 in VS 2010

- by rajbk

VS 2010 comes with ready made snippets which helps you save time while coding. You insert a snippet by typing the name of the code snippet and hitting the Tab key twice. You can also use the following method if you wish to see a listing of snippets available. Press Ctrl + K, Ctrl + X Select ASP.NET MVC2 with the arrow keys and hit enter to see a list of snippets available. The MVC related snippets you get out of the box (for C#) are listed below: HTML actionlink Markup snippet for an ASP.NET MVC action link helper <%= Html.ActionLink("linktext", "actionname") %> beginformajaxcs Markup snippet for an ASP.NET MVC AJAX-enabled form helper in C# <% using (Ajax.BeginForm("actionname", new AjaxOptions {UpdateTargetId= "elementid" })) { %> <% } %> beginformcs Markup snippet for an ASP.NET MVC form helper in C# <% using (Html.BeginForm()) { %> <% } %> displayforcs Markup snippet for an ASP.NET MVC templated helper. <%= Html.DisplayFor(x => x.Property) %> editorforcs Markup snippet for an ASP.NET MVC templated helper. <%= Html.EditorFor(x => x.Property) %> foreachcs Markup snippet for an ASP.NET MVC foreach statement in C# <% foreach (var item in collection) { %> <% } %> ifcs Markup snippet for a code-nugget if else statement in C# <% if (true) { %> <% } %> ifelsecs Markup snippet for a code-nugget if else statement in C# <% if (true) { %> <% } else { %> <% } %> renderpartialcs Markup snippet for an ASP.NET MVC partial view rendering in C# <% Html.RenderPartial("viewname"); %> textboxmvc Markup snippet for an ASP.NET MVC textbox helper <%= Html.TextBox("name") %> validationsummarymvc Markup snippet for an ASP.NET MVC validation summary helper <%= Html.ValidationSummary() %> CS mvcaction Code snippet for an action. public ActionResult Action() { return View(); } mvcpostaction Code snippet for an action via http post. [HttpPost] public ActionResult Action() { return View(); } Enjoy!

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Exploring packages in code

In my previous post Searching for tasks with code you can see how to explore the control flow side of packages, drilling down through containers, task, and event handlers, but it didn’t cover the data flow. I recently saw a post on the MSDN forum asking how to edit an existing package programmatically, and the sticking point was how to find the the data flow and the components inside. This post builds on some of the previous code and shows how you can explore all objects inside a package. I took the sample Task Search application I’d written previously, and came up with a totally pointless little console application that just walks through the package and writes out the basic type and name of every object it finds, starting with the package itself e.g. Package – MyPackage . The sample package we used last time showed nested objects as well an event handler; a OnPreExecute event tucked away on the task SQL In FEL. The output of this sample tool would look like this: PackageObjects v1.0.0.0 (1.0.0.26627) Copyright (C) 2009 Konesans Ltd Processing File - Z:\Users\Darren Green\Documents\Visual Studio 2005\Projects\SSISTestProject\EventsAndContainersWithExe cSQLForSearch.dtsx Package - EventsAndContainersWithExecSQLForSearch For Loop - FOR Counter Loop Task - SQL In Counter Loop Sequence Container - SEQ For Each Loop Wrapper For Each Loop - FEL Simple Loop Task - SQL In FEL Task - SQL On Pre Execute for FEL SQL Task Sequence Container - SEQ Top Level Sequence Container - SEQ Nested Lvl 1 Sequence Container - SEQ Nested Lvl 2 Task - SQL In Nested Lvl 2 Task - SQL In Nested Lvl 1 #1 Task - SQL In Nested Lvl 1 #2 Connection Manager – LocalHost The code is very similar to what we had previously, but there are a couple of extra bits to deal with connections and to look more closely at a task and see if it is a Data Flow task. For connections your just examine the package's Connections collection as shown in the abridged snippets below. First you can see the call to the ProcessConnections method, followed by the method itself. // Load the package file Application application = new Application(); using (Package package = application.LoadPackage(filename, null)) { // Write out the package name Console.WriteLine("Package - {0}", package.Name); ... More ... // Look and the connections ProcessConnections(package.Connections); } private static void ProcessConnections(Connections connections) { foreach (ConnectionManager connectionManager in connections) { Console.WriteLine("Connection Manager - {0}", connectionManager.Name); } } What we didn’t see in the sample output above was anything to do with the Data Flow, but rest assured the code now handles it too. The following snippet shows how each task is examined to see if it is a Data Flow task, and if so we can then loop through all of the components inside the data flow. private static void ProcessTaskHost(TaskHost taskHost) { if (taskHost == null) { return; } Console.WriteLine("Task - {0}", taskHost.Name); // Check if the task is a Data Flow task MainPipe pipeline = taskHost.InnerObject as MainPipe; if (pipeline != null) { ProcessPipeline(pipeline); } } private static void ProcessPipeline(MainPipe pipeline) { foreach (IDTSComponentMetaData90 componentMetadata in pipeline.ComponentMetaDataCollection) { Console.WriteLine("Pipeline Component - {0}", componentMetadata.Name); // If you wish to make changes to the component then you should really use the managed wrapper. // CManagedComponentWrapper wrapper = componentMetadata.Instantiate(); // wrapper.SetComponentProperty("PropertyName", "Value"); } } Hopefully you can see how we get a reference to the Data Flow task, and then use the ComponentMetaDataCollection to find out what components we have inside the pipeline. If you wanted to know more about the component you could look at the ObjectType or ComponentClassID properties. After that it gets a bit harder and you should get a reference to the wrapper object as the comment suggest and start using the properties, just like you would in the create packages samples, see our Code Development category for some for these examples. Download Sample code project PackageObjects.zip (5KB)

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Get started with C++ AMP

- by Daniel Moth

With the imminent release of Visual Studio 2012, even if you do not classify yourself as a C++ developer, C++ AMP is something you should learn so you can understand how to speed up your loops by offloading to the GPU the computation performed in the loop (assuming you have large number of iterations/data). We have many C# customers who are using C++ AMP through pinvoke, and of course many more directly from C++. So regardless of your programming language, I hope you'll find helpful these short videos that help you get started with C++ AMP C++ AMP core API introduction... from scratch Tiling Introduction - C++ AMP Matrix Multiplication with C++ AMP GPU debugging in Visual Studio 2012 In particular the work we have done for parallel and GPU debugging in Visual Studio 2012 is market leading, so check it out! Comments about this post by Daniel Moth welcome at the original blog.

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Visual Studio 2010 released!

Visual Studio 2010 releases to the word today. Get the full story from Soma's blog post (inc. links for buy, try etc). Our team is very proud of what we have contributed to this release and you can learn more about it through our content on the Parallel Computing MSDN home. Comments about this post welcome at the original blog. ...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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Introducing Microsoft SQL Server 2008 R2 - Business Intelligence Samples

- by smisner

On April 14, 2010, Microsoft Press (blog | twitter) released my latest book, co-authored with Ross Mistry (twitter), as a free ebook download - Introducing Microsoft SQL Server 2008 R2. As the title implies, this ebook is an introduction to the latest SQL Server release. Although you'll find a comprehensive review of the product's features in this book, you will not find the step-by-step details that are typical in my other books. For those readers who are interested in a more interactive learning experience, I have created two samples file for download: IntroSQLServer2008R2Samples project Sales Analysis workbook Here's a recap of the business intelligence chapters and the samples I used to generate the screen shots by chapter: Chapter 6: Scalable Data Warehousing covers a new edition of SQL Server, Parallel Data Warehouse. Understandably, Microsoft did not ship me the software and hardware to set up my own Parallel Data Warehouse environment for testing purposes and consequently you won't see any screenshots in this chapter. I received a lot of information and a lot of help from the product team during the development of this chapter to ensure its technical accuracy. Chapter 7: Master Data Services is a new component in SQL Server. After you install Master Data Services (MDS), which is a separate installation from SQL Server although it's found on the same media, you can install sample models to explore (which is what I did to create screenshots for the book). To do this, you deploying packages found at \Program Files\Microsoft SQL Server\Master Data Services\Samples\Packages. You will first need to use the Configuration Manager (in the Microsoft SQL Server 2008 R2\Master Data Services program group) to create a database and a Web application for MDS. Then when you launch the application, you'll see a Getting Started page which has a Deploy Sample Data link that you can use to deploy any of the sample packages. Chapter 8: Complex Event Processing is an introduction to another new component, StreamInsight. This topic was way too large to cover in-depth in a single chapter, so I focused on information such as architecture, development models, and an overview of the key sections of code you'll need to develop for your own applications. StreamInsight is an engine that operates on data in-flight and as such has no user interface that I could include in the book as screenshots. The November CTP version of SQL Server 2008 R2 included code samples as part of the installation, but these are not the official samples that will eventually be available in Codeplex. At the time of this writing, the samples are not yet published. Chapter 9: Reporting Services Enhancements provides an overview of all the changes to Reporting Services in SQL Server 2008 R2, and there are many! In previous posts, I shared more details than you'll find in the book about new functions (Lookup, MultiLookup, and LookupSet), properties for page numbering, and the new global variable RenderFormat. I will confess that I didn't use actual data in the book for my discussion on the Lookup functions, but I did create real reports for the blog posts and will upload those separately. For the other screenshots and examples in the book, I have created the IntroSQLServer2008R2Samples project for you to download. To preview these reports in Business Intelligence Development Studio, you must have the AdventureWorksDW2008R2 database installed, and you must download and install SQL Server 2008 R2. For the map report, you must execute the PopulationData.sql script that I included in the samples file to add a table to the AdventureWorksDW2008R2 database. The IntroSQLServer2008R2Samples project includes the following files: 01_AggregateOfAggregates.rdl to illustrate the use of embedded aggregate functions 02_RenderFormatAndPaging.rdl to illustrate the use of page break properties (Disabled, ResetPageNumber), the PageName property, and the RenderFormat global variable 03_DataSynchronization.rdl to illustrate the use of the DomainScope property 04_TextboxOrientation.rdl to illustrate the use of the WritingMode property 05_DataBar.rdl 06_Sparklines.rdl 07_Indicators.rdl 08_Map.rdl to illustrate a simple analytical map that uses color to show population counts by state PopulationData.sql to provide the data necessary for the map report Chapter 10: Self-Service Analysis with PowerPivot introduces two new components to the Microsoft BI stack, PowerPivot for Excel and PowerPivot for SharePoint, which you can learn more about at the PowerPivot site. To produce the screenshots for this chapter, I created the Sales Analysis workbook which you can download (although you must have Excel 2010 and the PowerPivot for Excel add-in installed to explore it fully). It's a rather simple workbook because space in the book did not permit a complete exploration of all the wonderful things you can do with PowerPivot. I used a tutorial that was available with the CTP version as a basis for the report so it might look familiar if you've already started learning about PowerPivot. In future posts, I'll continue exploring the new features in greater detail. If there's any special requests, please let me know! Share this post: email it! | bookmark it! | digg it! | reddit! | kick it! | live it!

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OpenGL's matrix stack vs Hand multiplying

- by deft_code

Which is more efficient using OpenGL's transformation stack or applying the transformations by hand. I've often heard that you should minimize the number of state transitions in your graphics pipeline. Pushing and popping translation matrices seem like a big change. However, I wonder if the graphics card might be able to more than make up for pipeline hiccup by using its parallel execution hardware to bulk multiply the vertices. My specific case. I have font rendered to a sprite sheet. The coordinates of each character or a string are calculated and added to a vertex buffer. Now I need to move that string. Would it be better to iterate through the vertex buffer and adjust each of the vertices by hand or temporarily push a new translation matrix?

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NET Math Libraries

- by JoshReuben

NET Mathematical Libraries .NET Builder for Matlab The MathWorks Inc. - http://www.mathworks.com/products/netbuilder/ MATLAB Builder NE generates MATLAB based .NET and COM components royalty-free deployment creates the components by encrypting MATLAB functions and generating either a .NET or COM wrapper around them. .NET/Link for Mathematica www.wolfram.com a product that 2-way integrates Mathematica and Microsoft's .NET platform call .NET from Mathematica - use arbitrary .NET types directly from the Mathematica language. use and control the Mathematica kernel from a .NET program. turns Mathematica into a scripting shell to leverage the computational services of Mathematica. write custom front ends for Mathematica or use Mathematica as a computational engine for another program comes with full source code. Leverages MathLink - a Wolfram Research's protocol for sending data and commands back and forth between Mathematica and other programs. .NET/Link abstracts the low-level details of the MathLink C API. Extreme Optimization http://www.extremeoptimization.com/ a collection of general-purpose mathematical and statistical classes built for the.NET framework. It combines a math library, a vector and matrix library, and a statistics library in one package. download the trial of version 4.0 to try it out. Multi-core ready - Full support for Task Parallel Library features including cancellation. Broad base of algorithms covering a wide range of numerical techniques, including: linear algebra (BLAS and LAPACK routines), numerical analysis (integration and differentiation), equation solvers. Mathematics leverages parallelism using .NET 4.0's Task Parallel Library. Basic math: Complex numbers, 'special functions' like Gamma and Bessel functions, numerical differentiation. Solving equations: Solve equations in one variable, or solve systems of linear or nonlinear equations. Curve fitting: Linear and nonlinear curve fitting, cubic splines, polynomials, orthogonal polynomials. Optimization: find the minimum or maximum of a function in one or more variables, linear programming and mixed integer programming. Numerical integration: Compute integrals over finite or infinite intervals, over 2D and higher dimensional regions. Integrate systems of ordinary differential equations (ODE's). Fast Fourier Transforms: 1D and 2D FFT's using managed or fast native code (32 and 64 bit) BigInteger, BigRational, and BigFloat: Perform operations with arbitrary precision. Vector and Matrix Library Real and complex vectors and matrices. Single and double precision for elements. Structured matrix types: including triangular, symmetrical and band matrices. Sparse matrices. Matrix factorizations: LU decomposition, QR decomposition, singular value decomposition, Cholesky decomposition, eigenvalue decomposition. Portability and performance: Calculations can be done in 100% managed code, or in hand-optimized processor-specific native code (32 and 64 bit). Statistics Data manipulation: Sort and filter data, process missing values, remove outliers, etc. Supports .NET data binding. Statistical Models: Simple, multiple, nonlinear, logistic, Poisson regression. Generalized Linear Models. One and two-way ANOVA. Hypothesis Tests: 12 14 hypothesis tests, including the z-test, t-test, F-test, runs test, and more advanced tests, such as the Anderson-Darling test for normality, one and two-sample Kolmogorov-Smirnov test, and Levene's test for homogeneity of variances. Multivariate Statistics: K-means cluster analysis, hierarchical cluster analysis, principal component analysis (PCA), multivariate probability distributions. Statistical Distributions: 25 29 continuous and discrete statistical distributions, including uniform, Poisson, normal, lognormal, Weibull and Gumbel (extreme value) distributions. Random numbers: Random variates from any distribution, 4 high-quality random number generators, low discrepancy sequences, shufflers. New in version 4.0 (November, 2010) Support for .NET Framework Version 4.0 and Visual Studio 2010 TPL Parallellized – multicore ready sparse linear program solver - can solve problems with more than 1 million variables. Mixed integer linear programming using a branch and bound algorithm. special functions: hypergeometric, Riemann zeta, elliptic integrals, Frensel functions, Dawson's integral. Full set of window functions for FFT's. Product Price Update subscription Single Developer License $999 $399 Team License (3 developers) $1999 $799 Department License (8 developers) $3999 $1599 Site License (Unlimited developers in one physical location) $7999 $3199 NMath http://www.centerspace.net .NET math and statistics libraries matrix and vector classes random number generators Fast Fourier Transforms (FFTs) numerical integration linear programming linear regression curve and surface fitting optimization hypothesis tests analysis of variance (ANOVA) probability distributions principal component analysis cluster analysis built on the Intel Math Kernel Library (MKL), which contains highly-optimized, extensively-threaded versions of BLAS (Basic Linear Algebra Subroutines) and LAPACK (Linear Algebra PACKage). Product Price Update subscription Single Developer License $1295 $388 Team License (5 developers) $5180 $1554 DotNumerics http://www.dotnumerics.com/NumericalLibraries/Default.aspx free DotNumerics is a website dedicated to numerical computing for .NET that includes a C# Numerical Library for .NET containing algorithms for Linear Algebra, Differential Equations and Optimization problems. The Linear Algebra library includes CSLapack, CSBlas and CSEispack, ports from Fortran to C# of LAPACK, BLAS and EISPACK, respectively. Linear Algebra (CSLapack, CSBlas and CSEispack). Systems of linear equations, eigenvalue problems, least-squares solutions of linear systems and singular value problems. Differential Equations. Initial-value problem for nonstiff and stiff ordinary differential equations ODEs (explicit Runge-Kutta, implicit Runge-Kutta, Gear's BDF and Adams-Moulton). Optimization. Unconstrained and bounded constrained optimization of multivariate functions (L-BFGS-B, Truncated Newton and Simplex methods). Math.NET Numerics http://numerics.mathdotnet.com/ free an open source numerical library - includes special functions, linear algebra, probability models, random numbers, interpolation, integral transforms. A merger of dnAnalytics with Math.NET Iridium in addition to a purely managed implementation will also support native hardware optimization. constants & special functions complex type support real and complex, dense and sparse linear algebra (with LU, QR, eigenvalues, ... decompositions) non-uniform probability distributions, multivariate distributions, sample generation alternative uniform random number generators descriptive statistics, including order statistics various interpolation methods, including barycentric approaches and splines numerical function integration (quadrature) routines integral transforms, like fourier transform (FFT) with arbitrary lengths support, and hartley spectral-space aware sequence manipulation (signal processing) combinatorics, polynomials, quaternions, basic number theory. parallelized where appropriate, to leverage multi-core and multi-processor systems fully managed or (if available) using native libraries (Intel MKL, ACMS, CUDA, FFTW) provides a native facade for F# developers

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ASP.NET MVC CRUD Validation

- by Ricardo Peres

One thing I didn’t refer on my previous post on ASP.NET MVC CRUD with AJAX was how to retrieve model validation information into the client. We want to send any model validation errors to the client in the JSON object that contains the ProductId, RowVersion and Success properties, specifically, if there are any errors, we will add an extra Errors collection property. Here’s how: 1: [HttpPost] 2: [AjaxOnly] 3: [Authorize] 4: public JsonResult Edit(Product product) 5: { 6: if (this.ModelState.IsValid == true) 7: { 8: using (ProductContext ctx = new ProductContext()) 9: { 10: Boolean success = false; 11: 12: ctx.Entry(product).State = (product.ProductId == 0) ? EntityState.Added : EntityState.Modified; 13: 14: try 15: { 16: success = (ctx.SaveChanges() == 1); 17: } 18: catch (DbUpdateConcurrencyException) 19: { 20: ctx.Entry(product).Reload(); 21: } 22: 23: return (this.Json(new { Success = success, ProductId = product.ProductId, RowVersion = Convert.ToBase64String(product.RowVersion) })); 24: } 25: } 26: else 27: { 28: Dictionary<String, String> errors = new Dictionary<String, String>(); 29: 30: foreach (KeyValuePair<String, ModelState> keyValue in this.ModelState) 31: { 32: String key = keyValue.Key; 33: ModelState modelState = keyValue.Value; 34: 35: foreach (ModelError error in modelState.Errors) 36: { 37: errors[key] = error.ErrorMessage; 38: } 39: } 40: 41: return (this.Json(new { Success = false, ProductId = 0, RowVersion = String.Empty, Errors = errors })); 42: } 43: } As for the view, we need to change slightly the onSuccess JavaScript handler on the Single view: 1: function onSuccess(ctx) 2: { 3: if (typeof (ctx.Success) != 'undefined') 4: { 5: $('input#ProductId').val(ctx.ProductId); 6: $('input#RowVersion').val(ctx.RowVersion); 7: 8: if (ctx.Success == false) 9: { 10: var errors = ''; 11: 12: if (typeof (ctx.Errors) != 'undefined') 13: { 14: for (var key in ctx.Errors) 15: { 16: errors += key + ': ' + ctx.Errors[key] + '\n'; 17: } 18: 19: window.alert('An error occurred while updating the entity: the model contained the following errors.\n\n' + errors); 20: } 21: else 22: { 23: window.alert('An error occurred while updating the entity: it may have been modified by third parties. Please try again.'); 24: } 25: } 26: else 27: { 28: window.alert('Saved successfully'); 29: } 30: } 31: else 32: { 33: if (window.confirm('Not logged in. Login now?') == true) 34: { 35: document.location.href = '<% 1: : FormsAuthentication.LoginUrl %>?ReturnURL=' + document.location.pathname; 36: } 37: } 38: } The logic is as this: If the Edit action method is called for a new entity (the ProductId is 0) and it is valid, the entity is saved, and the JSON results contains a Success flag set to true, a ProductId property with the database-generated primary key and a RowVersion with the server-generated ROWVERSION; If the model is not valid, the JSON result will contain the Success flag set to false and the Errors collection populated with all the model validation errors; If the entity already exists in the database (ProductId not 0) and the model is valid, but the stored ROWVERSION is different that the one on the view, the result will set the Success property to false and will return the current (as loaded from the database) value of the ROWVERSION on the RowVersion property. On a future post I will talk about the possibilities that exist for performing model validation, stay tuned!

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Microsoft Technical Computing

In the past I have described the team I belong to here at Microsoft (Parallel Computing Platform) in terms of contributing to Visual Studio and related products, e.g. .NET Framework. To be more precise, our team is part of the Technical Computing group, which is still part of the Developer Division. This was officially announced externally earlier this month in an exec email (from Bob Muglia, the president of STB, to which DevDiv belongs). Here is an extract: " As we build the Technical...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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Quick ways to boost performance and scalability of ASP.NET, WCF and Desktop Clients

- by oazabir

There are some simple configuration changes that you can make on machine.config and IIS to give your web applications significant performance boost. These are simple harmless changes but makes a lot of difference in terms of scalability. By tweaking system.net changes, you can increase the number of parallel calls that can be made from the services hosted on your servers as well as on desktop computers and thus increase scalability. By changing WCF throttling config you can increase number of simultaneous calls WCF can accept and thus make most use of your hardware power. By changing ASP.NET process model, you can increase number of concurrent requests that can be served by your website. And finally by turning on IIS caching and dynamic compression, you can dramatically increase the page download speed on browsers and and overall responsiveness of your applications. Read the CodeProject article for more details. http://www.codeproject.com/KB/webservices/quickwins.aspx Please vote for me if you find the article useful.

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How to achieve best performance in DirectX 9.0 while rendering on multiple monitors

- by Vibhore Tanwer

I am new to DirectX, and trying to learn best practice. Please suggest what are the best practices for rendering on multiple monitors different things at the same time? how can I boost performance of application? I have gone through this article http://msdn.microsoft.com/en-us/library/windows/desktop/bb147263%28v=vs.85%29.aspx . I am making use of some pixel shaders to achieve some effects. At most 4 effect(4 shader effects) can be applied at same time. What are the best practices to achieve best performance with DirectX 9.0. I read somewhere that DirectX 11 provides support for parallel rendering, but I am not able to get any working sample for DirectX 11.0. Please help me with this, Any help would be of great value. Thanks

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Data Warehouse Best Practices

- by jean-pierre.dijcks

In our quest to share our endless wisdom (ahem…) one of the things we figured might be handy is recording some of the best practices for data warehousing. And so we did. And, we did some more… We now have recreated our websites on Oracle Technology Network and have a separate page for best practices, parallelism and other cool topics related to data warehousing. But the main topic of this post is the set of recorded best practices. Here is what is available (and it is a series that ties together but can be read independently), applicable for almost any database version: Partitioning 3NF schema design for a data warehouse Star schema design Data Loading Parallel Execution Optimizer and Stats management The best practices page has a lot of other useful information so have a look here.

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Exploring packages in code

In my previous post Searching for tasks with code you can see how to explore the control flow side of packages, drilling down through containers, task, and event handlers, but it didn’t cover the data flow. I recently saw a post on the MSDN forum asking how to edit an existing package programmatically, and the sticking point was how to find the the data flow and the components inside. This post builds on some of the previous code and shows how you can explore all objects inside a package. I took the sample Task Search application I’d written previously, and came up with a totally pointless little console application that just walks through the package and writes out the basic type and name of every object it finds, starting with the package itself e.g. Package – MyPackage . The sample package we used last time showed nested objects as well an event handler; a OnPreExecute event tucked away on the task SQL In FEL. The output of this sample tool would look like this: PackageObjects v1.0.0.0 (1.0.0.26627) Copyright (C) 2009 Konesans Ltd Processing File - Z:\Users\Darren Green\Documents\Visual Studio 2005\Projects\SSISTestProject\EventsAndContainersWithExe cSQLForSearch.dtsx Package - EventsAndContainersWithExecSQLForSearch For Loop - FOR Counter Loop Task - SQL In Counter Loop Sequence Container - SEQ For Each Loop Wrapper For Each Loop - FEL Simple Loop Task - SQL In FEL Task - SQL On Pre Execute for FEL SQL Task Sequence Container - SEQ Top Level Sequence Container - SEQ Nested Lvl 1 Sequence Container - SEQ Nested Lvl 2 Task - SQL In Nested Lvl 2 Task - SQL In Nested Lvl 1 #1 Task - SQL In Nested Lvl 1 #2 Connection Manager – LocalHost The code is very similar to what we had previously, but there are a couple of extra bits to deal with connections and to look more closely at a task and see if it is a Data Flow task. For connections your just examine the package's Connections collection as shown in the abridged snippets below. First you can see the call to the ProcessConnections method, followed by the method itself. // Load the package file Application application = new Application(); using (Package package = application.LoadPackage(filename, null)) { // Write out the package name Console.WriteLine("Package - {0}", package.Name); ... More ... // Look and the connections ProcessConnections(package.Connections); } private static void ProcessConnections(Connections connections) { foreach (ConnectionManager connectionManager in connections) { Console.WriteLine("Connection Manager - {0}", connectionManager.Name); } } What we didn’t see in the sample output above was anything to do with the Data Flow, but rest assured the code now handles it too. The following snippet shows how each task is examined to see if it is a Data Flow task, and if so we can then loop through all of the components inside the data flow. private static void ProcessTaskHost(TaskHost taskHost) { if (taskHost == null) { return; } Console.WriteLine("Task - {0}", taskHost.Name); // Check if the task is a Data Flow task MainPipe pipeline = taskHost.InnerObject as MainPipe; if (pipeline != null) { ProcessPipeline(pipeline); } } private static void ProcessPipeline(MainPipe pipeline) { foreach (IDTSComponentMetaData90 componentMetadata in pipeline.ComponentMetaDataCollection) { Console.WriteLine("Pipeline Component - {0}", componentMetadata.Name); // If you wish to make changes to the component then you should really use the managed wrapper. // CManagedComponentWrapper wrapper = componentMetadata.Instantiate(); // wrapper.SetComponentProperty("PropertyName", "Value"); } } Hopefully you can see how we get a reference to the Data Flow task, and then use the ComponentMetaDataCollection to find out what components we have inside the pipeline. If you wanted to know more about the component you could look at the ObjectType or ComponentClassID properties. After that it gets a bit harder and you should get a reference to the wrapper object as the comment suggest and start using the properties, just like you would in the create packages samples, see our Code Development category for some for these examples. Download Sample code project PackageObjects.zip (5KB)

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