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• Is there a .NET BCL class to help with hand-rolled property path binding?

  - by Wayne

  WPF and Silverlight have a data binding model whereby I can provide a Binding with a Path which comprises a dot-notation of property accessors down from a DataContext to a specific value inside a complex object graph (eg. MyDataContext.RootProperty.SubProperty.Thing.Value) I have a (non-UI) requirement to accept such a path expressed as a simple string, and to use reflection on an object which is (hopefully) of a type which exposes the right property getters and setters in order to read and/or write values to those properties. Before I go off and start writing the parser and reflection code, is there a handy Framework 3.5 BCL class to help with this?

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• Getting a linq table to be dynamically sent to a method

  - by Damian Spaulding

  I have a procedure: var Edit = (from R in Linq.Products where R.ID == RecordID select R).Single(); That I would like to make "Linq.Products" Dynamic. Something like: protected void Page_Load(object sender, EventArgs e) { something(Linq.Products); } public void something(Object MyObject) { System.Data.Linq.Table<Product> Dynamic = (System.Data.Linq.Table<Product>)MyObject; var Edit = (from R in Dynamic where R.ID == RecordID select R).Single(); My problem is that I my "something" method will not be able to know what table has been sent to it. so the static line: System.Data.Linq.Table Dynamic = (System.Data.Linq.Table)MyObject; Would have to reflect somthing like: System.Data.Linq.Table Dynamic = (System.Data.Linq.Table)MyObject; With being a dynamic catch all variable so that Linq can just execute the code just like I hand coded it statically. I have been pulling my hair out with this one. Please help.

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• How to do a proper search with nhibernate

  - by Denis Rosca

  Hello everyone, i'm working on a small project that is supposed to allow basic searches of the database. Currently i'm using nhibernate for the database interaction. In the database i have 2 tables: Person and Address. The Person table has a many-to-one relationship with Address. The code i've come up with for doing searches is: public IList<T> GetByParameterList(List<QueryParameter> parameterList) { if (parameterList == null) { return GetAll(); } using (ISession session = NHibernateHelper.OpenSession()) { ICriteria criteria = session.CreateCriteria<T>(); foreach (QueryParameter param in parameterList) { switch (param.Constraint) { case ConstraintType.Less: criteria.Add(Expression.Lt(param.ParameterName, param.ParameterValue)); break; case ConstraintType.More: criteria.Add(Expression.Gt(param.ParameterName, param.ParameterValue)); break; case ConstraintType.LessOrEqual: criteria.Add(Expression.Le(param.ParameterName, param.ParameterValue)); break; case ConstraintType.EqualOrMore: criteria.Add(Expression.Ge(param.ParameterName, param.ParameterValue)); break; case ConstraintType.Equals: criteria.Add(Expression.Eq(param.ParameterName, param.ParameterValue)); break; case ConstraintType.Like: criteria.Add(Expression.Like(param.ParameterName, param.ParameterValue)); break; } } try { IList<T> result = criteria.List<T>(); return result; } catch { //TODO: Implement some exception handling throw; } } } The query parameter is a helper object that i use to create criterias and send it to the dal, it looks like this: public class QueryParameter { public QueryParameter(string ParameterName, Object ParameterValue, ConstraintType constraintType) { this.ParameterName = ParameterName; this.ParameterValue = ParameterValue; this.Constraint = constraintType; } public string ParameterName { get; set; } public Object ParameterValue { get; set; } public ConstraintType Constraint { get; set; } } Now this works well if i'm doing a search like FirstName = "John" , but not when i try to give a parameter like Street = "Some Street". It seems that nhibernate is looking for a street column in the Person table but not in the Address table. Any idea on how should i change my code for so i could do a proper search? Tips? Maybe some alternatives? Disclaimer: i'm kind of a noob so please be gentle ;) Thanks, Denis.

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• How to retrieve all the applications information in iphone

  - by Tony

  How can I use object-c to retrieve all the applications information in iphone.

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• Issues using UITapGestureRecognizers in Interface Builder

  - by 5StringRyan

  I'm attempting to use the UITapGestureRecognizer object that can be found in Interface Builder. I've dragged a single "UITapGestureRecognizer" from the object library to a single view xib. I then create an IBAction method from this tap gesture, for a simple test, I'm just printing an "NSLog" message to the console once there is a tap on the view. I've run this, and the tap method isn't being called. I right click the view in IB and I noticed that there is a warning "!" on the view's "Outlook Collections" I see: Outlook Collections gestureRecognizers - Tap Gesture Recognizer (!) The warning states: UIView does not have an outlet collection named gestureRecognizers. What do I need to do to remedy this?

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• What are alternatives to standard ORM in a data access layer?

  - by swampsjohn

  We're all familiar with basic ORM with relational databases: an object corresponds to a row and an attribute in that object to a column (or some slight variation), though many ORMs add a lot of bells and whistles. I'm wondering what other alternatives there are (besides raw access to the database or whatever you're working with). Alternatives that just work with relational databases would be great, but ones that could encapsulate multiple types of backends besides just SQL (such as flat files, RSS, NoSQL, etc.) would be even better. I'm more interested in ideas rather than specific implantations and what languages/platforms they work with, but please link to anything you think is interesting.

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• Is it possible to have a Shared/Static Dependency Property?

  - by Matt H.

  [using VB.NET, but I can easily read C# code in responses] I have a class called QuestionClipboard with ALL shared methods/properties. I previously had a QuesitonClipboard.doesClipboardHaveContent function that returned true/false if there was a Object on my 'clipboard'. I'd prefer to implement a Dependency Property so I can allow this true/false value to participate in data binding. The "GetValue(dp as DependencyProperty)" method requires an object instance, which would mean that my Property CAN'T be shared! Here is what the code would look like in my perfect world... Of course, the word "Shared" before the property declaration renders this code useless. Private Shared clipboardHasContentPropertyKey As DependencyPropertyKey = DependencyProperty.RegisterReadOnly("clipboardHasContent", GetType(Boolean), GetType(QuestionClipboard), _ New PropertyMetadata(False, Nothing, New CoerceValueCallback(AddressOf coerceClipboardHasContent))) Private Shared clipboardHasContentProperty As DependencyProperty = clipboardHasContentPropertyKey.DependencyProperty Public SHARED Property clipboardHasContent As Boolean Get Return GetValue(clipboardHasContentProperty) End Get Set(ByVal value As Boolean) SetValue(value) End Set End Property

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• Sorting Objects in NSArray

  - by Sam Budda

  I have an NSArray with 3 objects in it. Each object is made up of 5 values. How can I sort by Date with in the objects? result: ( gg, "2012-10-28 01:34:00 +0000", "Church Bells", "pin_red", 1 )( iu, "2008-09-22 17:32:00 +0000", "Birthday Song", "pin_red", 1 )( "my birthday woo hoo", "2012-09-04 19:27:00 +0000", "Birthday Song", "pin_blue", 1 ) The results I am looking for - Sorted Array should look like this. ( iu, "2008-09-22 17:32:00 +0000", "Birthday Song", "pin_red", 1 ) ( "my birthday woo hoo", "2012-09-04 19:27:00 +0000", "Birthday Song", "pin_blue", 1 ) ( gg, "2012-10-28 01:34:00 +0000", "Church Bells", "pin_red", 1 ) I am getting this array from my nsdictionary object. dictionary = [[NSMutableDictionary alloc] initWithContentsOfFile:stringsPlistPath]; stringsMutableArray = [[NSMutableArray alloc] initWithObjects:nil]; for (id key in dictionary) { [stringsMutableArray addObject:[dictionary objectForKey:key]]; }

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• Result of expression 'xxxx' is not a constructor in JS

  - by Pselus

  Trying to create an object in Javascript (for Appcelerator/Titanium). The "object" is defined like this: function server () { this.cacheimages = 0; this.login = ""; this.name = ""; this.root = ""; this.signup = ""; this.useimages = 0; this.userexists = ""; this.isdefault = 0; return this; } In the same file, in another function when I run this line: var server = new server(); I get the error Result of expression 'server' is not a constructor. I have tried it with and without the "return" line, neither work. What am I doing wrong?

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• How can I get jcifs to play nicely with apache axis

  - by Ben Hammond

  I need to connect Apache Axis 1.4 to a Webservice that uses NTLM authentication to restrict access to its operations. I'm expecting to use Samba Jcifs to handle the NTLM handshake. I found http://hc.apache.org/httpcomponents-client/ntlm.html which gives me fantastic directions for how to wire up HttpClient 4.0 with jcifs. Trouble is, Axis wants to use Http Client 3.0 and the two apis look very different. There are 2 possibilities that I can see Write an object for Axis that lets it plug into HttpClient 4. Figure out how to wire HttpClient 3.0 up with Samba Jcifs. Number 1. looks non-trivial, but possible Number 2. I cannot find any encouraging messages on the web describing how to do this. My question is: has anyone successfully connected samba jcifs with HttpClient 3.0 ? Has anyone already created an Axis HttpSender object that works with HttpClient 4 ? Is there some better alternative that I have not considered?

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• Parsing a text file with a fixed format in Java

  - by EugeneP

  Suppose I know a text file format, say, each line contains 4 fields like this: firstword secondword thirdword fourthword firstword2 secondword2 thirdword2 fourthword2 ... and I need to read it fully into memory I can use this approach: open a text file while not EOF read line by line split each line by a space create a new object with four fields extracted from each line add this object to a Set Ok, but is there anything better, a special 3-rd party Java library? So that we could define the structure of each text line beforehand and parse the file with some function thirdpartylib.setInputTextFileFormat("format.xml"); thirdpartylib.parse(Set, "pathToFile") ?

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• Using NSThread to solve waiting for image from URL on the iPhone

  - by james.ingham

  So I have the following code in a method which I want to set a UIImageView image to that of one from an online source: [NSThread detachNewThreadSelector:@selector(loadImage) toTarget:self withObject:nil]; Then in the method called by the thread I have this: - (void) loadImage { NSURL *url = [NSURL URLWithString:logoPath]; // logoPath is an NSString with path details NSData *data = [NSData dataWithContentsOfURL:url]; logoImage.image = [UIImage imageWithData:data]; } This works great however I get many warnings within the Debugger Console along the lines of: 2010-05-10 14:30:14.052 ProjectTitle[2930:633f] * _NSAutoreleaseNoPool(): Object 0x169d30 of class NSHTTPURLResponse autoreleased with no pool in place - just leaking This occurs many times each time I call the new thread and then eventually, under no pattern, after calling a few of these threads I get the classic 'EXC_BAD_ACCESS' run-time error. I understand that this is happening because I'm not retaining the object but how can I solve this with the code in 'loadImage' shown above? Thanks

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• using a Singleton to pass credentials in a multi-tenant application a code smell?

  - by Hans Gruber

  Currently working on a multi-tenant application that employs Shared DB/Shared Schema approach. IOW, we enforce tenant data segregation by defining a TenantID column on all tables. By convention, all SQL reads/writes must include a Where TenantID = '?' clause. Not an ideal solution, but hindsight is 20/20. Anyway, since virtually every page/workflow in our app must display tenant specific data, I made the (poor) decision at the project's outset to employ a Singleton to encapsulate the current user credentials (i.e. TenantID and UserID). My thinking at the time was that I didn't want to add a TenantID parameter to each and every method signature in my Data layer. Here's what the basic pseudo-code looks like: public class UserIdentity { public UserIdentity(int tenantID, int userID) { TenantID = tenantID; UserID = userID; } public int TenantID { get; private set; } public int UserID { get; private set; } } public class AuthenticationModule : IHttpModule { public void Init(HttpApplication context) { context.AuthenticateRequest += new EventHandler(context_AuthenticateRequest); } private void context_AuthenticateRequest(object sender, EventArgs e) { var userIdentity = _authenticationService.AuthenticateUser(sender); if (userIdentity == null) { //authentication failed, so redirect to login page, etc } else { //put the userIdentity into the HttpContext object so that //its only valid for the lifetime of a single request HttpContext.Current.Items["UserIdentity"] = userIdentity; } } } public static class CurrentUser { public static UserIdentity Instance { get { return HttpContext.Current.Items["UserIdentity"]; } } } public class WidgetRepository: IWidgetRepository{ public IEnumerable<Widget> ListWidgets(){ var tenantId = CurrentUser.Instance.TenantID; //call sproc with tenantId parameter } } As you can see, there are several code smells here. This is a singleton, so it's already not unit test friendly. On top of that you have a very tight-coupling between CurrentUser and the HttpContext object. By extension, this also means that I have a reference to System.Web in my Data layer (shudder). I want to pay down some technical debt this sprint by getting rid of this singleton for the reasons mentioned above. I have a few thoughts on what an better implementation might be, but if anyone has any guidance or lessons learned they could share, I would be much obliged.

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• How do I extend a WPF application using an addin-like architeture?

  - by Thiado de Arruda

  Lets say I have a WPF application that shows a ListBox with an ArrayList -populated with objects of arbitrary types- as a source, and this application is hosted in an assembly 'A'. By default the ListBox will display the custom object 'ToString' method return value. If a data template for that object type is found, the ListBox will use it for rendering. Imagine that theres another assembly 'B' that references of 'A' and seeks to extend it by providing custom data templates for certain types, to be used in that ListBox. Is there some way to do that without 'A'being aware of B?

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• 2 Classes need each other declared C++

  - by Prodigga

  I have a "Game" class which holds all the games settings and manages the game. I have a "Grid" class which is the grid the game is played on. The "Game" class initializes a "Grid" object as one of its members (passing itself ("this") as one of the parameters for "Grid"s constructor).. The "Grid" object therefor needs to deal with a "Game*" pointer. To do this it needs to know what "Game" is; i need to declare it before "Grid". But "Game" uses "Grid"...so it also needs "Grid" declared before it. so confused on how to include headers/etc correctly here..

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• How to make DropDownList automatically be selected based on the Label.Text

  - by Archana B.R

  I have a DropDownlist in the GridView, which should be visible only when edit is clicked. I have bound the DropDownList from code behind. When I click on Edit, the label value of that cell should automatically get selected in the DropDownList. The code I have tried is: protected void GridView3_RowDataBound(object sender, GridViewRowEventArgs e) { if (e.Row.RowType == DataControlRowType.DataRow) { SqlCommand cmd = new SqlCommand("SELECT Location_Name FROM Location_Table"); DropDownList bind_drop = (e.Row.FindControl("DropList") as DropDownList); bind_drop.DataSource = this.ExecuteQuery(cmd, "SELECT"); bind_drop.DataTextField = "Location_Name"; bind_drop.DataValueField = "Location_Name"; bind_drop.DataBind(); string Loc_type = (e.Row.FindControl("id2") as Label).Text.Trim(); bind_drop.Items.FindByValue(Loc_type).Selected = true; } } When I run the code, it gives an exception error Object reference not set in the last line of the above code. Cannot find out whats wrong. Kindly help

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• ea: import requirements from csv file

  - by bolekprez

  During import requirements from csv file I have a message: Bad object type when creating new record of type '' File I was trying to import: GUID$Name$Notes$Scope {BF467CF6-FF97-4dd4-894C-3F09E713678C}$NameOfReq$description$Public {71B26F9A-5418-499e-B635-F2DB158D3FF1}$Requirement1$$Public {0}$Requir1$blah$Public First 2 (+header) lines becomes from existing requirements and there is no problem with import. Last line should create a new object of requirement in enterprise architect, but there is a message mentioned above. Any solution? How should proper file to create (import from csv file) a new requirements look like?

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• iPhone - Launching selectors from a different class

  - by David Schiefer

  Hi, I'd like to reload a table view which is in another class called "WriteIt_MobileAppDelegate" from one of my other classes which is called "Properties". I've tried to do this via the NSNotificationCenter class - the log gets called but the table is never updated. Properties.h: [[NSNotificationCenter defaultCenter] postNotificationName:@"NameChanged" object:[WriteIt_MobileAppDelegate class] userInfo:nil]; WriteIt_MobileAppDelegate.m -(void)awakeFromNib { [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reloadItProperties:) name:@"NameChanged" object:self]; } - (void) reloadItProperties: (NSNotification *)notification { NSLog(@"Reloading Data"); //this gets called [self.navigationController popToRootViewControllerAnimated:YES]; [self.tblSimpleTable reloadData]; [self.tblSimpleTable reloadSectionIndexTitles]; // but the rest doesn't } What am I doing wrong here?

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• jQuery .getJSON() Not Parsing All Objects

  - by Brad

  I'm using jQuery's .getJSON function to parse a set of search results from a Google Search Appliance. The search appliance has an xslt stylesheet that returns the results as JSON data, which I validated with both JSONLint and Curious Concept's JSON Formatter. According to FireBug, the full result set is returned from the XMLHTTPRequest, but I tried dumping the data (with jquery.dump.js) and it only ever parses back the first result. It does successfully get all the Google Search Protocol stuff, but it only ever sees one "R" object (or individual result). Has anybody had a similar problem with jQuery's .getJSON? I know it likes to fail silently if the JSON is not valid, but like I said, I validated the results with several validators and it should be good to go. Edit: Clicking this link will show you the JSON results returned for a search for the word "google": http://bigbird.uww.edu/search?client=json_frontend&proxystylesheet=json_frontend&proxyrefresh=1&output=xml_no_dtd&q=google jQuery only retrieves the first "R" object, even though all "R" objects are siblings.

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• help designing a method, should I use out or ref or return the type?

  - by Blankman

  I have a method that I will use in the following contexts: 1. User user = null; if(...) { user = defaultUser; SetUser(a,b,user); } else { SetUser(a,b,user); } SaveUser(user); So some cases are where user may be null, while in other cases it will already be initialized. How should I design the SetUser method? I currently have it like so, but this causes an error when user is null. public void SetUser(object a, object b, User user) { if(user == null) user = new User(); user.Security = a.security; user.Blah = b.type; }

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• DeleteObject method is missing in Entity Framework 4.1

  - by bobetko

  This is driving me crazy. I am getting error that object doesn't contain definition for DeleteObject. Here is my line of code that produces an error: ctx.Tanks.DeleteObject(Tank); I tried to reference another object from another edmx file that my friend has created and then everything is fine, DeleteObject exists. I don't think I miss any references in my project. And project itself contains edmx file and I used DBContext to create POCOs. Any ideas?

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• Pure virtual destructor in interface

  - by ALOR

  Hello all. Here is my problem. I'm making C++ dll, which extensively relies on instance object exports. So i return my actual instances as a pointers to interface through some exported factory method. Interfaces i use are purely virtual, to avoid linking problame. So i need a pure virtual destructor too, and i implemented one (with empty body, as i googled it). All compiles perfectly well, except... I can't see, if the actual destructors are called or not - because when i added some std::cout << "hello destructor"; i never get to see it. I have some explicit "delete obj", that's not the problem. Am i missing something? Is there another way to delete my object through interface?

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• tabcontainer button postback problem

  - by yousof

  I have a dropdownlist in my web page and two command buttons and a tabcontainer. The tabcontainer does not appear after the load of page according to my code. Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load If Not IsPostBack Then TabContainer1.Visible = False If CtvAct.GetRecords("Fill_RequestTypeTb") = True Then ReqTypeCmbo.DataSource = CtvAct.MainDataset.Tables("tbOLRequestType").DefaultView ReqTypeCmbo.DataTextField = "RequestTypeName" ReqTypeCmbo.DataValueField = "RequestTypeId" ReqTypeCmbo.DataBind() Dim itm As New ListItem itm.Text = "-- ??? ??? ????? --" itm.Value = "-1" itm.Selected = True ReqTypeCmbo.Items.Insert(0, itm) ReqTypeCmbo.SelectedIndex = 0 End If End If End Sub Protected Sub PrntCmd_Click(ByVal sender As Object, ByVal e As EventArgs) Handles PrntCmd.Click TextBox6.Text = "gggg" End Sub If I press any button after page load the button work very selecting any item from dropdownlist make the tabcontainer appear but after the tabcontainer appear, the buttons does not work (postback) how can I solve these problems

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• C# dependency injection - how to you inject a dependency without source?

  - by Phil Harris

  Hi, I am trying to get started with some simple dependency injection using C# and i've run up against an issue that I can't seem to come up with an answer for. I have a class that was written by another department for which I don't have the source in my project. I wanted to inject an object of this type though a constructor using an interface, but of course, i can't change the injected objects implementation to implement the interface to achieve polymorphism when casting the object to the interface type. Every academic example I have ever seen of this technique has the classes uses classes which are declared in the project itself. How would I go about injecting my dependency without the source being available in the project? I hope that makes sense, thanks.

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• Why does this VBS scheduled task (to call a URL) not work in Windows Server 2008?

  - by user303644

  This same script worked in older server OS environments, and even on my desktop; and allows me to kick off a nightly process on my website's URL. It simply will not execute the URL in my Windows Server 2008 environment. It does not generate any errors, claiming task completion I can pull the same URL up just fine in the server's web browser I have the script running with "highest privileges" I even tried to create a batch file which executes it, so I can explicitly "Run as Administrator" and it still will not execute the URL (but will not generate any errors either). I'm baffled as to why the task claims to have completed successfully, yet the script never reaches the URL. Call LogEntry() Sub LogEntry() 'Force the script to finish on an error. On Error Resume Next 'Declare variables Dim objRequest Dim URL Set objRequest = CreateObject("MSXML2.ServerXMLHTTP") 'Put together the URL link appending the Variables. URL = "http://myURL/AutorunNightlyTasks.aspx" 'Open the HTTP request and pass the URL to the objRequest object objRequest.open "GET", URL, False 'Send the HTML Request objRequest.send() 'Set the object to nothing Set objRequest = Nothing End Sub

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