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Show me your Linq to SQL architectures!

- by Brad Heller

I've been using Linq to SQL for a new implementation that I've been working on. I have about 5000 lines of code and am a little ways from a solid demo. I've been pretty satisfied with Linq to SQL so far -- the tools are excellent and pretty painless and it allows you to get a DAL up and running quickly. That said, there are some major draw backs that I just keep hitting over and over again. Namely how to handle separation of concerns between my DAL and my business layer and juggling that with different data contexts. Here is the architecture I've been using: My repositories do all my data access and they return Linq to SQL objects. Each of my Linq to SQL objects implements an IDetachable interface. A typical implementation looks like this: partial class PaymentDetail : IDetachable { #region IDetachable Members public bool IsAttached { get { return PropertyChanging != null; } } public void Detach() { if (IsAttached) { PropertyChanged = null; PropertyChanging = null; Transaction.Detach(); } } #endregion } Every time I do a DAL operation in my repository I "detach" when I'm done with the object (and it should theoretically detach from any child objects) to remove the DataContext's context. Like I said, this works pretty well, but there are some edge cases that seem to be a big pain in the ass. For instance, my Transaction object has many PaymentDetails. Even when there are no PaymentDetails in that collection it's still attached to the DataContext's context! Thus, if I try to update (I update by Attach()ing to the object and then SubmitChanges()) I get that dreaded "An attempt has been made to Attach or Add an entity that is not new, perhaps having been loaded from another DataContext. This is not supported." message. Anyway, I'm starting to doubt that this technology was a good gamble. Has anyone got a decent architecture that they're willing to share? I'd really love to use this technology but I feel like I spend 1/3 of my time just debugging is retarded quirks!

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Update one-to-many EntityKey using Foreign Key

- by User.Anonymous

To use by the easiest way Entity Framework, I use partial class to add Foreign Key on most important Entities Model. For example, I have an Entity "CONTACT" which have "TITLE", "FUNCTION" and others. When I update a CONTACT, with this code, Foreign Key are automatically updated : public int? TitId { get { if (this.TITLE_TIT != null) return TITLE_TIT.TIT_ID; return new Nullable<int>(); } set { this.TITLE_TITReference.EntityKey = new System.Data.EntityKey("Entities.TITLE_TIT", "TIT_ID", value); } } But I have a join with ACTIVITY, that can have many CONTACT, and I don't know how to update EntityKey on setters. public IEnumerable<EntityKeyMember> ActId { get { List<EntityKeyMember> lst = new List<EntityKeyMember>(); if (this.ACT_CON2 != null) { foreach (ACT_CON2 id in this.ACT_CON2.ToList()) { EntityKeyMember key = new EntityKeyMember(id.CON_ID.ToString(),id.ACT_ID); lst.Add(key); } } return lst; } set { this.ACT_CON2.EntityKey = new System.Data.EntityKey("Entities.ACT_CON2", value); } } How set many EntityKey ? Thank you.

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Rails fields_for parameters for a has_many relation don't yield an Array in params

- by user1289061

I have a model Sensor with has_many and accepts_nested_attributes_for relationships to another model Watch. In a form to update a Sensor, I have something like the following <%= sensor_form.fields_for :watches do |watches_form| %> <%= watches_form.label :label %><br /> <%= watches_form.text_field :label %> <% end %> This is indended to allow editting of the already-created Watches belonging to a Sensor. This call spits form inputs as so: <input name="sensor[watches_attributes][0][label]" ... /> <input name="sensor[watches_attributes][0][id]" ... /> When this gets submitted, the params object in the Sensor controller gets an assoc like "sensor" => { "id"=>"1", "watches_attributes"=> { "0"=>{"id" => "1", "label" => "foo"}, "1"=>{"id" => "2", "label" => "bar"} } } For a has_many, accepts_nested_attributes_for update to work upon the @sensor.update_attributes call, it seems that that attributes key really must map to an Array. From what I've seen in the examples, the combination of has_many, accepts_nested_attributes_for, and sensor_form.fields_for should allow me to pass the resulting params object directly to @sensor.update_attributes and update each related object as intended. Instead the Sensor takes place, with no errors, but the Watch objects are not updated (since "watches_attributes" maps to a Hash instead of an Array?) Have I missed something?

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CSS does not load when updated in an ASP.NET MVC 2 website

- by dannie.f

I have a weird problem. Whenever the website designer updates the css file for the website I am working on. I overwrite the old css file with the new version and copy any new images. The problem is that whenever I do this the images in the website header no longer loads along with some other styles that depend on css loading some images. I have tried everything, clearing the browser cache, deleting asp.net temporary files, restarting the browser, changing browsers and pressing Ctrl + F5. Still the images don't load. What usually happens also is that the problem would eventually correct itself and I wouldn't know why. This driving me crazy. Does anyone else have the problem and know how to fix it? If this helps, the header is located in a partial view and the master page loads the css file using Url.Content. The images are css sprites. This issue persists no matter which browser I try, Chrome, Firefox or IE. I am using Visual Studio 2008 SP1 on Windows 7 Ultimate. Other team members have experienced this issue.

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How to make a custom NSFormatter work correctly on Snow Leopard?

- by Nathan

I have a custom NSFormatter attached to several NSTextFields who's only purpose is to uppercase the characters as they are typed into field. The entire code for my formatter is included below. The stringForObjectValue() and getObjectValue() implementations are no-ops and taken pretty much directly out of Apple's documentation. I'm using the isPartialStringValid() method to return an uppercase version of the string. This code works correctly in 10.4 and 10.5. When I run it on 10.6, I get "strange" behaviour where text fields aren't always render the characters that are typed and sometimes are just displaying garbage. I've tried enabling NSZombie detection and running under Instruments but nothing was reported. I see errors like the following in "Console": HIToolbox: ignoring exception '*** -[NSCFString replaceCharactersInRange:withString:]: Range or index out of bounds' that raised inside Carbon event dispatch ( 0 CoreFoundation 0x917ca58a __raiseError + 410 1 libobjc.A.dylib 0x94581f49 objc_exception_throw + 56 2 CoreFoundation 0x917ca2b8 +[NSException raise:format:arguments:] + 136 3 CoreFoundation 0x917ca22a +[NSException raise:format:] + 58 4 Foundation 0x9140f528 mutateError + 218 5 AppKit 0x9563803a -[NSCell textView:shouldChangeTextInRange:replacementString:] + 852 6 AppKit 0x95636cf1 -[NSTextView(NSSharing) shouldChangeTextInRanges:replacementStrings:] + 1276 7 AppKit 0x95635704 -[NSTextView insertText:replacementRange:] + 667 8 AppKit 0x956333bb -[NSTextInputContext handleTSMEvent:] + 2657 9 AppKit 0x95632949 _NSTSMEventHandler + 209 10 HIToolbox 0x93379129 _ZL23DispatchEventToHandlersP14EventTargetRecP14OpaqueEventRefP14HandlerCallRec + 1567 11 HIToolbox 0x933783f0 _ZL30SendEventToEventTargetInternalP14OpaqueEventRefP20OpaqueEventTargetRefP14HandlerCallRec + 411 12 HIToolbox 0x9339aa81 SendEventToEventTarget + 52 13 HIToolbox 0x933fc952 SendTSMEvent + 82 14 HIToolbox 0x933fc2cf SendUnicodeTextAEToUnicodeDoc + 700 15 HIToolbox 0x933fbed9 TSMKeyEvent + 998 16 HIToolbox 0x933ecede TSMProcessRawKeyEvent + 2515 17 AppKit 0x95632228 -[NSTextInputContext handleEvent:] + 1453 18 AppKit 0x9562e088 -[NSView interpretKeyEvents:] + 209 19 AppKit 0x95631b45 -[NSTextView keyDown:] + 751 20 AppKit 0x95563194 -[NSWindow sendEvent:] + 5757 21 AppKit 0x9547bceb -[NSApplication sendEvent:] + 6431 22 AppKit 0x9540f6fb -[NSApplication run] + 917 23 AppKit 0x95407735 NSApplicationMain + 574 24 macsetup 0x00001f9f main + 24 25 macsetup 0x00001b75 start + 53 ) Can anybody shed some light on what is happening? Am I just using NSFormatter incorrectly? -(NSString*) stringForObjectValue:(id)object { if( ![object isKindOfClass: [ NSString class ] ] ) { return nil; } return [ NSString stringWithString: object ]; } -(BOOL)getObjectValue: (id*)object forString: string errorDescription:(NSString**)error { if( object ) { *object = [ NSString stringWithString: string ]; return YES; } return NO; } -(BOOL) isPartialStringValid: (NSString*) cStr newEditingString: (NSString**) nStr errorDescription: (NSString**) error { *nStr = [NSString stringWithString: [cStr uppercaseString]]; return NO; }

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documenting class attributes

- by intuited

I'm writing a lightweight class whose attributes are intended to be publicly accessible, and only sometimes overridden in specific instantiations. There's no provision in the Python language for creating docstrings for class attributes, or any sort of attributes, for that matter. What is the accepted way, should there be one, to document these attributes? Currently I'm doing this sort of thing: class Albatross(object): """A bird with a flight speed exceeding that of an unladen swallow. Attributes: """ flight_speed = 691 __doc__ += """ flight_speed (691) The maximum speed that such a bird can attain. """ nesting_grounds = "Raymond Luxury-Yacht" __doc__ += """ nesting_grounds ("Raymond Luxury-Yacht") The locale where these birds congregate to reproduce. """ def __init__(**keyargs): """Initialize the Albatross from the keyword arguments.""" self.__dict__.update(keyargs) Although this style doesn't seem to be expressly forbidden in the docstring style guidelines, it's also not mentioned as an option. The advantage here is that it provides a way to document attributes alongside their definitions, while still creating a presentable class docstring, and avoiding having to write comments that reiterate the information from the docstring. I'm still kind of annoyed that I have to actually write the attributes twice; I'm considering using the string representations of the values in the docstring to at least avoid duplication of the default values. Is this a heinous breach of the ad hoc community conventions? Is it okay? Is there a better way? For example, it's possible to create a dictionary containing values and docstrings for the attributes and then add the contents to the class __dict__ and docstring towards the end of the class declaration; this would alleviate the need to type the attribute names and values twice. edit: this last idea is, I think, not actually possible, at least not without dynamically building the class from data, which seems like a really bad idea unless there's some other reason to do that. I'm pretty new to python and still working out the details of coding style, so unrelated critiques are also welcome.

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Simple imeplementation of admin/staff panel?

- by Michael Mao

Hi all: A new project requires a simple panel(page) for admin and staff members that : Preferably will not use SSL or any digital ceritification stuff, a simple login from via http will just be fine. has basic authentication which allows only admin to login as admin, and any staff member as of the group "staff". Ideally, the "credentials(username-hashedpassword pair)" will be stored in MySQL. is simple to configure if there is a package, or the strategy is simple to code. somewhere (PHP session?) somehow (include a script at the beginning of each page to check user group before doing anything?), it will detect any invalid user attempt to access protected page and redirect him/her to the login form. while still keeps high quality in security, something I worry about the most. Frankly I am having little knowledge about Internet security, and how modern CMS such as WordPress/Joomla do with their implementation in this. I only have one thing in my mind that I need to use a salt to hash the password (SHA1?) to make sure any hacker gets the username and password pair across the net cannot use that to log into the system. And that is what the client wants to make sure. But I really not sure where to start, any ideas? Thanks a lot in advance.

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Join + IEqualityComparer<T> and HashCode

- by Jesus Rodriguez

Im writing my own LINQ reference but Im getting troubles with some of the more complicated operators implementations. There is a Join implementation that takes a IEqualityComparer Im getting just crazy. Im trying to understand it first before I write (obviously) Image this two lists: List<string> initials = new List<string> {"A", "B", "C", "D", "E"}; List<string> words = new List<string> {"Ant", "Crawl", "Pig", "Boat", "Elephant", "Arc"}; Nothing weird here. I want to join both lists by the Initial, something like: Initial=A Word=Ant Initial=A Word=Arc Initial=B Word=Boat ... I need a comparator, I wrote this: public class InitialComparator : IEqualityComparer<string> { public bool Equals(string x, string y) { return x.StartsWith(y); } public int GetHashCode(string obj) { return obj[0].GetHashCode(); } } The Join itself: var blah = initials.Join(words, initial => initial, word => word, (initial, word) => new {Initial = initial, Word = word}, new InitialComparator()); It's the first time Im using HashCodes, after a good session of debugging I see that every word go to the comparator and look at its HashCode, if another word has the same HashCode it calls equals. Since I want to compare just the initial I though that I just need the first letter Hash (Am I wrong?) The thing is that this is not working correctly. Its says that "Ant" and "Arc" are equals, Ok, its comparing every word in the same list or not, But it adds only the last word it finds, in this case Arc, ignoring Ant and Ant is equals to "A" too... If I put "Ant" and "Ant" it add both. In short, What is the way of doing something like that? I know that Im doing something wrong. Thank you.

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How can you start a process from asp.net without interfering with the website?

- by Sem Dendoncker

Hi, We have an asp.net application that is able to create .air files. To do this we use the following code: System.Diagnostics.Process process = new System.Diagnostics.Process(); //process.StartInfo.FileName = strBatchFile; if (File.Exists(@"C:\Program Files\Java\jre6\bin\java.exe")) { process.StartInfo.FileName = @"C:\Program Files\Java\jre6\bin\java.exe"; } else { process.StartInfo.FileName = @"C:\Program Files (x86)\Java\jre6\bin\java.exe"; } process.StartInfo.Arguments = GetArguments(); process.StartInfo.RedirectStandardOutput = true; process.StartInfo.RedirectStandardError = true; process.StartInfo.UseShellExecute = false; process.PriorityClass = ProcessPriorityClass.Idle; process.Start(); string strOutput = process.StandardOutput.ReadToEnd(); string strError = process.StandardError.ReadToEnd(); HttpContext.Current.Response.Write(strOutput + "<p>" + strError + "</p>"); process.WaitForExit(); Well the problem now is that sometimes the cpu of the server is reaching 100% causing the application to run very slow and even lose sessions (we think this is the problem). Is there any other solution on how to generate air files or run an external process without interfering with the asp.net application? Cheers, M.

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Save has_and_belongs_to_many link in basic RoR app

- by Stéphane V

I try to learn the has_and_belongs_to_many relationship between my 2 fresh new and simple models Product and Author, where a Product can have many authors and where author can have a lots of products. I wrote this : class Author < ActiveRecord::Base has_and_belongs_to_many :products end class Product < ActiveRecord::Base has_and_belongs_to_many :authors end In the partial form of view for the products, I have : <p>Products</p> <%= collection_select(:product, :author_ids, @authors, :id, :name, :prompt => " ", :multiple => true) %> but when I hit the update button, I get this strange message I can't resolve myself : NoMethodError in ProductsController#update undefined method `reject' for "1":String Rails.root: /home/stephane/www/HABTM Application Trace | Framework Trace | Full Trace app/controllers/products_controller.rb:63:in block in update' app/controllers/products_controller.rb:62:inupdate' Request Parameters: {"utf8"="âœ“", "_method"="put", "authenticity_token"="2GlTssOFjTVZ9BikrIFgx22cdTOIJuAB70liYhhLf+4=", "product"={"title"="Le trÃ©sor des Templiers", "original_title"="", "number"="1", "added_by"="", "author_ids"="1"}, "commit"="Update Product", "id"="1"} What's wrong ? Is there a problem with :product_ids... I saw on internet I had to pu a "s" but I'm not sure of what it represents.... How can I link the table authors_products to the key which is given back by the drop-down menu ? (here "author_ids"="1") Thx !

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Writing language converter in ANTLR

- by Stefan

I'm writing a converter between some dialects of the same programming language. I've found a grammar on the net - it's complex and handles all the cases. Now I'm trying to write the appropriate actions. Most of the input is just going to be rewritten to output. What I need to do is parse function calls, do my magic (rename function, reorder arguments, etc) and write it. I'm using AST as output. When I come across a function call, I build a custom object structure (from classes defined in my target language), call the appropriate function and I have a string that represents the transformed function that I want to get. The problem is, what I'm supposed to do with that string? I'd like to replace the .text attribute of the enclosing rule, but setText() is only available on lexer rules and the rule's .text attribute is read-only. How to solve this problem? program : statement_list { output = $statement_list.text; } ; //... statement : expression_statement // ... ; expression_statement : function_call // ... ; function_call : ID '(' { /* build the object, assign name */ Function function = new Function(); //... } ( arg1 = expression { /* add first parameter */ } ( ',' arg2 = expression { /* add the rest of parameters */ } )* )? ')' { /* convert the function call */ string converted = Tools.Convert(function); // $setText(converted); // doesn't work // $functionCall.text = converted; // doesn't work } ;

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Make winform run away from the mouse.

- by JACK IN THE CRACK

Okay so I'm trying to make a little gag program that will "run away" from the mouse. So, to get the mouse coordinates for the whole screen and not just the form control I had to create a little helper: static class MouseHelper { [DllImport("user32.dll")] [return: MarshalAs(UnmanagedType.Bool)] internal static extern bool GetCursorPos(ref Point pt); public static Point GetPosition() { Point w32Mouse = new Point(); GetCursorPos(ref w32Mouse); return w32Mouse; } } Now I thought I was going to use the MouseMove event... but that doesn't work for outside the form control either so I have an auto-enabled timer on a 10ms loop called timerMouseMove. public partial class Form1 : Form { public Form1() { InitializeComponent(); } private bool CollisionCheck() { Point win32Mouse = MouseHelper.GetPosition(); if (win32Mouse.X <= Location.X || win32Mouse.X >= (Location.X + Width)) return false; if (win32Mouse.Y <= Location.Y || win32Mouse.Y >= (Location.Y + Height)) return false; return true; } private void timerMouseMove_Tick(object sender, EventArgs e) { if (CollisionCheck()) Location = new Point(Location.X + 1, Location.Y + 1); } } So this works out nicely, at least I have the collision checking working and whatnot. But now, how should I go about figuring which side of the form the mouse has collided with, so that I can update its location to move in the opposite direction the mouse collides with it? And such halp

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How can I use "Dependency Injection" in simple php functions, and should I bother?

- by Tchalvak

I hear people talking about dependency injection and the benefit of it all the time, but I don't really understand it. I'm wondering if it's a solution to the "I pass database connections as arguments all the time" problem. I tried reading wikipedia's entry on it, but the example is written in Java so I don't solidly understand the difference it is trying to make clear. ( http://en.wikipedia.org/wiki/Dependency_injection ). I read this dependency-injection-in-php article ( http://www.potstuck.com/2009/01/08/php-dependency-injection/ ), and it seems like the objective is to not pass dependencies to an object directly, but to cordon off the creation of an object along with the creation of it's dependencies. I'm not sure how to apply that in a using php functions context, though. Additionally, is the following Dependency Injection, and should I bother trying to do dependency injection in a functional context? Version 1: (the kind of code that I create, but don't like, every day) function get_data_from_database($database_connection){ $data = $database_connection->query('blah'); return $data; } Version 2: (don't have to pass a database connection, but perhaps not dependency injection?) function get_database_connection(){ static $db_connection; if($db_connection){ return $db_connection; } else { // create db_connection ... } } function get_data_from_database(){ $conn = get_database_connection(); $data = $conn->query('blah'); return $data; } $data = get_data_from_database(); Version 3: (the creation of the "object"/data is separate, and the database code is still, so perhaps this would count as dependency injection?) function factory_of_data_set(){ static $db_connection; $data_set = null; $db_connection = get_database_connection(); $data_set = $db_connection->query('blah'); return $data_set; } $data = factory_of_data_set(); Anyone have a good resource or just insight that makes the method and benefit -crystal- clear?

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documenting class properties

- by intuited

I'm writing a lightweight class whose properties are intended to be publicly accessible, and only sometimes overridden in specific instantiations. There's no provision in the Python language for creating docstrings for class properties, or any sort of properties, for that matter. What is the accepted way, should there be one, to document these properties? Currently I'm doing this sort of thing: class Albatross(object): """A bird with a flight speed exceeding that of an unladen swallow. Properties: """ flight_speed = 691 __doc__ += """ flight_speed (691) The maximum speed that such a bird can attain """ nesting_grounds = "Throatwarbler Man Grove" __doc__ += """ nesting_grounds ("Throatwarbler Man Grove") The locale where these birds congregate to reproduce. """ def __init__(**keyargs): """Initialize the Albatross from the keyword arguments.""" self.__dict__.update(keyargs) Although this style doesn't seem to be expressly forbidden in the docstring style guidelines, it's also not mentioned as an option. The advantage here is that it provides a way to document properties alongside their definitions, while still creating a presentable class docstring, and avoiding having to write comments that reiterate the information from the docstring. I'm still kind of annoyed that I have to actually write the properties twice; I'm considering using the string representations of the values in the docstring to at least avoid duplication of the default values. Is this a heinous breach of the ad hoc community conventions? Is it okay? Is there a better way? For example, it's possible to create a dictionary containing values and docstrings for the properties and then add the contents to the class __dict__ and docstring towards the end of the class declaration; this would alleviate the need to type the property names and values twice. I'm pretty new to python and still working out the details of coding style, so unrelated critiques are also welcome.

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MS Dynamics CRM trapping .NET error before I can handle it

- by clifgriffin

This is a fun one. I have written a custom search page that provides faster, more user friendly searches than the default Contacts view and also allows searching of Leads and Contacts simultaneously. It uses GridViews bound to SqlDataSources that query filtered views. I'm sure someone will complain that I'm not using the web services for this, but this is just the design decision we made. These GridViews live in UpdatePanels to enable very slick AJAX updates upon search. It's all working great. Nearly ready to be deployed, except for one thing: Some long running searches are triggering an uncatchable SQL timeout exception. [SqlException: Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding.] at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection) at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) at System.Data.SqlClient.SqlDataReader.ConsumeMetaData() at System.Data.SqlClient.SqlDataReader.get_MetaData() at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString) at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async) at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result) at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method) at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method) at System.Data.SqlClient.SqlCommand.ExecuteDbDataReader(CommandBehavior behavior) at System.Data.Common.DbCommand.System.Data.IDbCommand.ExecuteReader(CommandBehavior behavior) at System.Data.Common.DbDataAdapter.FillInternal(DataSet dataset, DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) at System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) at System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, String srcTable) at System.Web.UI.WebControls.SqlDataSourceView.ExecuteSelect(DataSourceSelectArguments arguments) at System.Web.UI.DataSourceView.Select(DataSourceSelectArguments arguments, DataSourceViewSelectCallback callback) at System.Web.UI.WebControls.DataBoundControl.PerformSelect() at System.Web.UI.WebControls.BaseDataBoundControl.DataBind() at System.Web.UI.WebControls.GridView.DataBind() at System.Web.UI.WebControls.BaseDataBoundControl.EnsureDataBound() at System.Web.UI.WebControls.CompositeDataBoundControl.CreateChildControls() at System.Web.UI.Control.EnsureChildControls() at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) I found that CRM is doing a server.transfer to capture this error because my UpdatePanels started throwing JavaSript errors when this error would occur. I was only able to get the full error message by using the JavaScript debugger in IE. Having found this error, I thought the solution would be simple. I just needed to wrap my databind calls in try/catch blocks to capture any errors. Unfortunately it seems CRM's IIS configuration has the magic ability to capture this error before it ever gets back to my code. Using the debugger I never see it. It never gets to my catch blocks, but it's clearly happening in the SQL Data Source which is clearly (by the stack trace) being triggered by my GridView bind. Any ideas on this? It's driving me crazy. Code Behind (with some irrelevant functions omitted): protected void Page_Load(object sender, EventArgs e) { //Initialize some stuff this.bannerOracle = new OdbcConnection(ConfigurationManager.ConnectionStrings["OracleConnectionString"].ConnectionString); //Prospect default HideProspects(); HideProspectAddressColumn(); //Contacts default HideContactAddressColumn(); //Default error messages gvContacts.EmptyDataText = "Sad day. Your search returned no contacts."; gvProspects.EmptyDataText = "Sad day. Your search returned no prospects."; //New search try { SearchContact(null, -1); } catch { gvContacts.EmptyDataText = "Oops! An error occured. This may have been a timeout. Please try your search again."; gvContacts.DataSource = null; gvContacts.DataBind(); } } protected void txtSearchString_TextChanged(object sender, EventArgs e) { if(!String.IsNullOrEmpty(txtSearchString.Text)) { try { SearchContact(txtSearchString.Text, Convert.ToInt16(lstSearchType.SelectedValue)); } catch { gvContacts.EmptyDataText = "Oops! An error occured. This may have been a timeout. Please try your search again."; gvContacts.DataSource = null; gvContacts.DataBind(); } if (chkProspects.Checked == true) { try { SearchProspect(txtSearchString.Text, Convert.ToInt16(lstSearchType.SelectedValue)); } catch { gvProspects.EmptyDataText = "Oops! An error occured. This may have been a timeout. Please try your search again."; gvProspects.DataSource = null; gvProspects.DataBind(); } finally { ShowProspects(); } } else { HideProspects(); } } } protected void SearchContact(string search, int type) { SqlCRM_Contact.ConnectionString = ConfigurationManager.ConnectionStrings["MSSQLConnectionString"].ConnectionString; gvContacts.DataSourceID = "SqlCRM_Contact"; string strQuery = ""; string baseQuery = @"SELECT filteredcontact.contactid, filteredcontact.new_libertyid, filteredcontact.fullname, 'none' AS line1, filteredcontact.emailaddress1, filteredcontact.telephone1, filteredcontact.birthdateutc AS birthdate, filteredcontact.gendercodename FROM filteredcontact "; switch(type) { case LASTFIRST: strQuery = baseQuery + "WHERE fullname LIKE @value AND filteredcontact.statecode = 0"; SqlCRM_Contact.SelectCommand = strQuery; SqlCRM_Contact.SelectParameters.Add("value", DbType.String, search.Trim() + "%"); break; case LAST: strQuery = baseQuery + "WHERE lastname LIKE @value AND filteredcontact.statecode = 0"; SqlCRM_Contact.SelectCommand = strQuery; SqlCRM_Contact.SelectParameters.Add("value", DbType.String, search.Trim() + "%"); break; case FIRST: strQuery = baseQuery + "WHERE firstname LIKE @value AND filteredcontact.statecode = 0"; SqlCRM_Contact.SelectCommand = strQuery; SqlCRM_Contact.SelectParameters.Add("value", DbType.String, search.Trim() + "%"); break; case LIBERTYID: strQuery = baseQuery + "WHERE new_libertyid LIKE @value AND filteredcontact.statecode = 0"; SqlCRM_Contact.SelectCommand = strQuery; SqlCRM_Contact.SelectParameters.Add("value", DbType.String, search.Trim() + "%"); break; case EMAIL: strQuery = baseQuery + "WHERE emailaddress1 LIKE @value AND filteredcontact.statecode = 0"; SqlCRM_Contact.SelectCommand = strQuery; SqlCRM_Contact.SelectParameters.Add("value", DbType.String, search.Trim() + "%"); break; case TELEPHONE: strQuery = baseQuery + "WHERE telephone1 LIKE @value AND filteredcontact.statecode = 0"; SqlCRM_Contact.SelectCommand = strQuery; SqlCRM_Contact.SelectParameters.Add("value", DbType.String, search.Trim() + "%"); break; case BIRTHDAY: strQuery = baseQuery + "WHERE filteredcontact.birthdateutc BETWEEN @dateStart AND @dateEnd AND filteredcontact.statecode = 0"; try { DateTime temp = DateTime.Parse(search); if (temp.Year < 1753 || temp.Year > 9999) { search = string.Empty; } else { search = temp.ToString("yyyy-MM-dd"); } } catch { search = string.Empty; } SqlCRM_Contact.SelectCommand = strQuery; SqlCRM_Contact.SelectParameters.Add("dateStart", DbType.String, search.Trim() + " 00:00:00.000"); SqlCRM_Contact.SelectParameters.Add("dateEnd", DbType.String, search.Trim() + " 23:59:59.999"); break; case SSN: //Do something break; case ADDRESS: strQuery = @"SELECT contactid, new_libertyid, fullname, line1, emailaddress1, telephone1, birthdate, gendercodename FROM (SELECT FC.contactid, FC.new_libertyid, FC.fullname, FA.line1, FC.emailaddress1, FC.telephone1, FC.birthdateutc AS birthdate, FC.gendercodename, ROW_NUMBER() OVER(PARTITION BY FC.contactid ORDER BY FC.contactid DESC) AS rn FROM filteredcontact FC INNER JOIN FilteredCustomerAddress FA ON FC.contactid = FA.parentid WHERE FA.line1 LIKE @value AND FA.addressnumber <> 1 AND FC.statecode = 0 ) AS RESULTS WHERE rn = 1"; SqlCRM_Contact.SelectCommand = strQuery; SqlCRM_Contact.SelectParameters.Add("value", DbType.String, search.Trim() + "%"); ShowContactAddressColumn(); break; default: strQuery = @"SELECT TOP 500 filteredcontact.contactid, filteredcontact.new_libertyid, filteredcontact.fullname, 'none' AS line1, filteredcontact.emailaddress1, filteredcontact.telephone1, filteredcontact.birthdateutc AS birthdate, filteredcontact.gendercodename FROM filteredcontact WHERE filteredcontact.statecode = 0"; SqlCRM_Contact.SelectCommand = strQuery; break; } if (type != ADDRESS) { HideContactAddressColumn(); } gvContacts.PageIndex = 0; //try //{ // SqlCRM_Contact.DataBind(); //} //catch //{ // SqlCRM_Contact.DataBind(); //} gvContacts.DataBind(); } protected void SearchProspect(string search, int type) { SqlCRM_Prospect.ConnectionString = ConfigurationManager.ConnectionStrings["MSSQLConnectionString"].ConnectionString; gvProspects.DataSourceID = "SqlCRM_Prospect"; string strQuery = ""; string baseQuery = @"SELECT filteredlead.leadid, filteredlead.fullname, 'none' AS address1_line1, filteredlead.emailaddress1, filteredlead.telephone1, filteredlead.lu_dateofbirthutc AS lu_dateofbirth, filteredlead.lu_gendername FROM filteredlead "; switch (type) { case LASTFIRST: strQuery = baseQuery + "WHERE fullname LIKE @value AND filteredlead.statecode = 0"; SqlCRM_Prospect.SelectCommand = strQuery; SqlCRM_Prospect.SelectParameters.Add("value", DbType.String, search.Trim() + "%"); break; case LAST: strQuery = baseQuery + "WHERE lastname LIKE @value AND filteredlead.statecode = 0"; SqlCRM_Prospect.SelectCommand = strQuery; SqlCRM_Prospect.SelectParameters.Add("value", DbType.String, search.Trim() + "%"); break; case FIRST: strQuery = baseQuery + "WHERE firstname LIKE @value AND filteredlead.statecode = 0"; SqlCRM_Prospect.SelectCommand = strQuery; SqlCRM_Prospect.SelectParameters.Add("value", DbType.String, search.Trim() + "%"); break; case LIBERTYID: strQuery = baseQuery + "WHERE new_libertyid LIKE @value AND filteredlead.statecode = 0"; SqlCRM_Prospect.SelectCommand = strQuery; SqlCRM_Prospect.SelectParameters.Add("value", DbType.String, search.Trim() + "%"); break; case EMAIL: strQuery = baseQuery + "WHERE emailaddress1 LIKE @value AND filteredlead.statecode = 0"; SqlCRM_Prospect.SelectCommand = strQuery; SqlCRM_Prospect.SelectParameters.Add("value", DbType.String, search.Trim() + "%"); break; case TELEPHONE: strQuery = baseQuery + "WHERE telephone1 LIKE @value AND filteredlead.statecode = 0"; SqlCRM_Prospect.SelectCommand = strQuery; SqlCRM_Prospect.SelectParameters.Add("value", DbType.String, search.Trim() + "%"); break; case BIRTHDAY: strQuery = baseQuery + "WHERE filteredlead.lu_dateofbirth BETWEEN @dateStart AND @dateEnd AND filteredlead.statecode = 0"; try { DateTime temp = DateTime.Parse(search); if (temp.Year < 1753 || temp.Year > 9999) { search = string.Empty; } else { search = temp.ToString("yyyy-MM-dd"); } } catch { search = string.Empty; } SqlCRM_Prospect.SelectCommand = strQuery; SqlCRM_Prospect.SelectParameters.Add("dateStart", DbType.String, search.Trim() + " 00:00:00.000"); SqlCRM_Prospect.SelectParameters.Add("dateEnd", DbType.String, search.Trim() + " 23:59:59.999"); break; case SSN: //Do nothing break; case ADDRESS: strQuery = @"SELECT filteredlead.leadid, filteredlead.fullname, filteredlead.address1_line1, filteredlead.emailaddress1, filteredlead.telephone1, filteredlead.lu_dateofbirthutc AS lu_dateofbirth, filteredlead.lu_gendername FROM filteredlead WHERE address1_line1 LIKE @value AND filteredlead.statecode = 0"; SqlCRM_Prospect.SelectCommand = strQuery; SqlCRM_Prospect.SelectParameters.Add("value", DbType.String, search.Trim() + "%"); ShowProspectAddressColumn(); break; default: strQuery = @"SELECT TOP 500 filteredlead.leadid, filteredlead.fullname, 'none' AS address1_line1 filteredlead.emailaddress1, filteredlead.telephone1, filteredlead.lu_dateofbirthutc AS lu_dateofbirth, filteredlead.lu_gendername FROM filteredlead WHERE filteredlead.statecode = 0"; SqlCRM_Prospect.SelectCommand = strQuery; break; } if (type != ADDRESS) { HideProspectAddressColumn(); } gvProspects.PageIndex = 0; //try //{ // SqlCRM_Prospect.DataBind(); //} //catch (Exception ex) //{ // SqlCRM_Prospect.DataBind(); //} gvProspects.DataBind(); }

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Binding a date string parameter in an MS Access PDO query

- by harryg

I've made a PDO database class which I use to run queries on an MS Access database. When querying using a date condition, as is common in SQL, dates are passed as a string. Access usually expects the date to be surrounded in hashes however. E.g. SELECT transactions.amount FROM transactions WHERE transactions.date = #2013-05-25#; If I where to run this query using PDO I might do the following. //instatiate pdo connection etc... resulting in a $db object $stmt = $db->prepare('SELECT transactions.amount FROM transactions WHERE transactions.date = #:mydate#;'); //prepare the query $stmt->bindValue('mydate', '2013-05-25', PDO::PARAM_STR); //bind the date as a string $stmt->execute(); //run it $result = $stmt->fetch(); //get the results As far as my understanding goes the statement that results from the above would look like this as binding a string results in it being surrounded by quotes: SELECT transactions.amount FROM transactions WHERE transactions.date = #'2013-05-25'#; This causes an error and prevents the statement from running. What's the best way to bind a date string in PDO without causing this error? I'm currently resorting to sprintf-ing the string which I'm sure is bad practise. Edit: if I pass the hash-surrounded date then I still get the error as below: Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE[22018]: Invalid character value for cast specification: -3030 [Microsoft][ODBC Microsoft Access Driver] Data type mismatch in criteria expression. (SQLExecute[-3030] at ext\pdo_odbc\odbc_stmt.c:254)' in C:\xampp\htdocs\ips\php\classes.php:49 Stack trace: #0 C:\xampp\htdocs\ips\php\classes.php(49): PDOStatement-execute() #1 C:\xampp\htdocs\ips\php\classes.php(52): database-execute() #2 C:\xampp\htdocs\ips\try2.php(12): database-resultset() #3 {main} thrown in C:\xampp\htdocs\ips\php\classes.php on line 49

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Who architected / designed C++'s IOStreams, and would it still be considered well-designed by today'

- by stakx

First off, it may seem that I'm asking for subjective opinions, but that's not what I'm after. I'd love to hear some well-grounded arguments on this topic. In the hope of getting some insight into how a modern streams / serialization framework ought to be designed, I recently got myself a copy of the book Standard C++ IOStreams and Locales by Angelika Langer and Klaus Kreft. I figured that if IOStreams wasn't well-designed, it wouldn't have made it into the C++ standard library in the first place. After having read various parts of this book, I am starting to have doubts if IOStreams can compare to e.g. the STL from an overall architectural point-of-view. Read e.g. this interview with Alexander Stepanov (the STL's "inventor") to learn about some design decisions that went into the STL. What surprises me in particular: It seems to be unknown who was responsible for IOStreams' overall design (I'd love to read some background information about this — does anyone know good resources?); Once you delve beneath the immediate surface of IOStreams, e.g. if you want to extend IOStreams with your own classes, you get to an interface with fairly cryptic and confusing member function names, e.g. getloc/imbue, uflow/underflow, snextc/sbumpc/sgetc/sgetn, pbase/pptr/epptr (and there's probably even worse examples). This makes it so much harder to understand the overall design and how the single parts co-operate. Even the book I mentioned above doesn't help that much (IMHO). Thus my question: If you had to judge by today's software engineering standards (if there actually is any general agreement on these), would C++'s IOStreams still be considered well-designed? (I wouldn't want to improve my software design skills from something that's generally considered outdated.)

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Python performance improvement request for winkler

- by Martlark

I'm a python n00b and I'd like some suggestions on how to improve the algorithm to improve the performance of this method to compute the Jaro-Winkler distance of two names. def winklerCompareP(str1, str2): """Return approximate string comparator measure (between 0.0 and 1.0) USAGE: score = winkler(str1, str2) ARGUMENTS: str1 The first string str2 The second string DESCRIPTION: As described in 'An Application of the Fellegi-Sunter Model of Record Linkage to the 1990 U.S. Decennial Census' by William E. Winkler and Yves Thibaudeau. Based on the 'jaro' string comparator, but modifies it according to whether the first few characters are the same or not. """ # Quick check if the strings are the same - - - - - - - - - - - - - - - - - - # jaro_winkler_marker_char = chr(1) if (str1 == str2): return 1.0 len1 = len(str1) len2 = len(str2) halflen = max(len1,len2) / 2 - 1 ass1 = '' # Characters assigned in str1 ass2 = '' # Characters assigned in str2 #ass1 = '' #ass2 = '' workstr1 = str1 workstr2 = str2 common1 = 0 # Number of common characters common2 = 0 #print "'len1', str1[i], start, end, index, ass1, workstr2, common1" # Analyse the first string - - - - - - - - - - - - - - - - - - - - - - - - - # for i in range(len1): start = max(0,i-halflen) end = min(i+halflen+1,len2) index = workstr2.find(str1[i],start,end) #print 'len1', str1[i], start, end, index, ass1, workstr2, common1 if (index > -1): # Found common character common1 += 1 #ass1 += str1[i] ass1 = ass1 + str1[i] workstr2 = workstr2[:index]+jaro_winkler_marker_char+workstr2[index+1:] #print "str1 analyse result", ass1, common1 #print "str1 analyse result", ass1, common1 # Analyse the second string - - - - - - - - - - - - - - - - - - - - - - - - - # for i in range(len2): start = max(0,i-halflen) end = min(i+halflen+1,len1) index = workstr1.find(str2[i],start,end) #print 'len2', str2[i], start, end, index, ass1, workstr1, common2 if (index > -1): # Found common character common2 += 1 #ass2 += str2[i] ass2 = ass2 + str2[i] workstr1 = workstr1[:index]+jaro_winkler_marker_char+workstr1[index+1:] if (common1 != common2): print('Winkler: Wrong common values for strings "%s" and "%s"' % \ (str1, str2) + ', common1: %i, common2: %i' % (common1, common2) + \ ', common should be the same.') common1 = float(common1+common2) / 2.0 ##### This is just a fix ##### if (common1 == 0): return 0.0 # Compute number of transpositions - - - - - - - - - - - - - - - - - - - - - # transposition = 0 for i in range(len(ass1)): if (ass1[i] != ass2[i]): transposition += 1 transposition = transposition / 2.0 # Now compute how many characters are common at beginning - - - - - - - - - - # minlen = min(len1,len2) for same in range(minlen+1): if (str1[:same] != str2[:same]): break same -= 1 if (same > 4): same = 4 common1 = float(common1) w = 1./3.*(common1 / float(len1) + common1 / float(len2) + (common1-transposition) / common1) wn = w + same*0.1 * (1.0 - w) return wn

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How to move list items from two lists (from different areas) to one specific list by clicking the li

- by pschorr

I've been having some issues setting up a list of items and moving them between each other. Is it possible to have multiple lists, with a link inside each item to move it to a specified list? i.e. List of actions with a plus next to the action, click the plus and move to a specified box? Furthermore, would it be possible to then load a lightbox (code would have to be inline I'd guess) from that page and move those names to the specific list as well? Example Images Thanks much! More broad view of my efforts so far... The initial issue being that I could not use listboxes due to their being rendered natively inside each individual browser. Through listboxes I was able to set this up, but with a trigger via the code below (found on stackoverflow). While it gave me partial functionality it did not get the target I was looking for. document.getElementById('moveTrigger').onclick = function() { var listTwo = document.getElementById('secondList'); var options = document.getElementById('firstList').getElementsByTagName('option'); while(options.length != 0) { listTwo.appendChild(options[0]); } } I then moved onto jqueryui's sortable and it's ability to connect multiple, and most important, style-able lists and to be dragged between each other. This works for the side by side tables, but it does not offer the usability I was looking for overall. So, I've come to where I'm unsure as to where to move forward. While I can get around PHP, I wouldn't know where to start with this one personally. I'm open to any and all options! Thanks much!

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PInvokeStackImbalance -- C# with offreg.dll ( windows ddk7 )

- by user301185

I am trying to create an offline registry in memory using the offreg.dll provided in the windows ddk 7 package. You can find out more information on the offreg.dll here: MSDN Currently, while attempted to create the hive using ORCreateHive, I receive the following error: "Managed Debugging Assistant 'PInvokeStackImbalance' has detected a problem. This is likely because the managed PInvoke signature does not match the unmanaged target signature. Check that the calling convention and parameters of the PInvoke signature match the target unmanaged signature." Here is the offreg.h file containing ORCreateHive: typedef PVOID ORHKEY; typedef ORHKEY *PORHKEY; VOID ORAPI ORGetVersion( __out PDWORD pdwMajorVersion, __out PDWORD pdwMinorVersion ); DWORD ORAPI OROpenHive ( __in PCWSTR lpHivePath, __out PORHKEY phkResult ); DWORD ORAPI ORCreateHive ( __out PORHKEY phkResult ); DWORD ORAPI ORCloseHive ( __in ORHKEY Handle ); The following is my C# code attempting to call the .dll and create the pointer for future use. using System.Runtime.InteropServices; namespace WindowsFormsApplication6 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } [DllImport("offreg.dll", CharSet = CharSet.Auto, EntryPoint = "ORCreateHive", SetLastError=true, CallingConvention = CallingConvention.StdCall)] public static extern IntPtr ORCreateHive2(); private void button1_Click(object sender, EventArgs e) { try { IntPtr myHandle = ORCreateHive2(); } catch (Exception r) { MessageBox.Show(r.ToString()); } } } } I have been able to create pointers in the past with no issue utilizing user32.dll, icmp.dll, etc. However, I am having no such luck with offreg.dll. Thank you.

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SendInput scan code on Windows 7 x64

- by Stanomatic

I am working with a WPF application sending keys to a game. I opened spy++ to observer s as a key press on the keyboard. I then press my button on the application and I noticed a different scan code in spy++ messages. Could this be somthing to do with Windows 7 64bit? Partial listing: var down = new INPUT(); down.Type = (UInt32)InputType.KEYBOARD; down.Data.Keyboard = new KEYBDINPUT(); down.Data.Keyboard.Vk = (UInt16)keyCode; down.Data.Keyboard.Scan = 0; down.Data.Keyboard.Flags = 0; down.Data.Keyboard.Time = 0; down.Data.Keyboard.ExtraInfo = IntPtr.Zero; //down.Data.Keyboard.ExtraInfo = GetMessageExtraInfo(); var up = new INPUT(); up.Type = (UInt32)InputType.KEYBOARD; up.Data.Keyboard = new KEYBDINPUT(); up.Data.Keyboard.Vk = (UInt16)keyCode; up.Data.Keyboard.Scan = 0; up.Data.Keyboard.Flags = (UInt32)KeyboardFlag.KEYUP; up.Data.Keyboard.Time = 0; up.Data.Keyboard.ExtraInfo = IntPtr.Zero; //up.Data.Keyboard.ExtraInfo = GetMessageExtraInfo(); INPUT[] inputList = new INPUT[2]; inputList[0] = down; inputList[1] = up; var numberOfSuccessfulSimulatedInputs = SendInput(2, inputList, Marshal.SizeOf(typeof(INPUT))); The image shows when I use my code to send a key I receive ScanCode:00fExtended from spy++ message output. When I actually press the same key I receive ScanCode:1FfExtended. Everything else is identical.

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Scheduling of tasks to a single resource using Prolog

- by Reed Debaets

I searched through here as best I could and though I found some relevant questions, I don't think they covered the question at hand: Assume a single resource and a known list of requests to schedule a task. Each request includes a start_after, start_by, expected_duration, and action. The goal is to schedule the tasks for execution as soon as possible while keeping each task scheduled between start_after and start_by. I coded up a simple prolog example that I "thought" should work but I've been unfortunately getting errors during run time: "=/2: Arguments are not sufficiently instantiated". Any help or advice would be greatly appreciated startAfter(1,0). startAfter(2,0). startAfter(3,0). startBy(1,100). startBy(2,500). startBy(3,300). duration(1,199). duration(2,199). duration(3,199). action(1,'noop1'). action(2,'noop2'). action(3,'noop3'). can_run(R,T) :- startAfter(R,TA),startBy(R,TB),T>=TA,T=<TB. conflicts(T,R1,T1) :- duration(R1,D1),T=<D1+T1,T>T1. schedule(R1,T1,R2,T2,R3,T3) :- can_run(R1,T1),\+conflicts(T1,R2,T2),\+conflicts(T1,R3,T3), can_run(R2,T2),\+conflicts(T2,R1,T1),\+conflicts(T2,R3,T3), can_run(R3,T3),\+conflicts(T3,R1,T1),\+conflicts(T3,R2,T2). % when traced I *should* see T1=0, T2=400, T3=200 Edit: conflicts goal wasn't quite right: needed extra TT1 clause. Edit: Apparently my schedule goal works if I supply valid Request,Time pairs ... but I'm stucking trying to force prolog to find valid values for T1..3 when given R1..3?

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Test Views in ASP.NET MVC2 (ala RSpec)

- by Dmitriy Nagirnyak

Hi, I am really missing heavily the ability to test Views independently of controllers. The way RSpec does it. What I want to do is to perform assertions on the rendered view (where no controller is involved!). In order to do so I should provide required Model, ViewData and maybe some details from HttpContextBase (when will we get rid of HttpContext!). So far I have not found anything that allows doing it. Also it might heavily depend on the ViewEngine being used. List of things that views might contain are: Partial views (may be nested deeply). Master pages (or similar in other view engines). Html helpers generating links and other elements. Generally almost anything in a range of common sense :) . Also please note that I am not talking about client-side testing and thus Selenium is just not related to it at all. It is just plain .NET testing. So are there any options to actually do the testing of views? Thanks, Dmitriy.

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proper way to dynamically assign backbone.js view el

- by kikuchiyo

I would like to create two ( or more ) view instances, each with different el attributes, and have events bound to them via backbone.js view's events hash ( not through jQuery ). Getting events to trigger when all instantiations have the same el is easy: someView = Backbone.View.extend({ el: '#someDiv', events: { 'click': 'someFunction' }, someFunction: function(){ //Do something here } }); So far, if I assign el in the initialize function, and set events normally as follows, events do not trigger: someView = Backbone.View.extend({ events: { 'click': 'someFunction' }, initialize: function( options ){ this.el = options.el }, someFunction: function(){ //Do something here } }); My first instinct was to have el be a function that returns the string representation of the dom element of interest: someView = Backbone.View.extend({ el: function(){ return '#someDiv-' + this.someNumber }, events: { 'click': 'someFunction' }, initialize: function( options ){ this.someNumber = options.someNumber }, someFunction: function(){ //Do something here } }); However, this triggers someFunction x times if I have x instantiations of someView. Next I tried setting both the el and events attributes in initialize: someView = Backbone.View.extend({ initialize: function( options ){ this.el = options.el this.events = { 'click': 'someFunction' } }, someFunction: function(){ //Do something here } }); but this does not trigger events. At this point I'm pretty much fishing. Does anyone know how instantiate a backbone.js view with an el specific to that instance that has events that only trigger for that instance, and not other instances of the View?

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Creating LINQ to SQL Data Models' Data Contexts with ASP.NET MVC

- by Maxim Z.

I'm just getting started with ASP.NET MVC, mostly by reading ScottGu's tutorial. To create my database connections, I followed the steps he outlined, which were to create a LINQ-to-SQL dbml model, add in the database tables through the Server Explorer, and finally to create a DataContext class. That last part is the part I'm stuck on. In this class, I'm trying to create methods that work around the exposed data. Following the example in the tutorial, I created this: using System; using System.Collections.Generic; using System.Linq; using System.Web; namespace MySite.Models { public partial class MyDataContext { public List<Post> GetPosts() { return Posts.ToList(); } public Post GetPostById(int id) { return Posts.Single(p => p.ID == id); } } } As you can see, I'm trying to use my Post data table. However, it doesn't recognize the "Posts" part of my code. What am I doing wrong? I have a feeling that my problem is related to my not adding the data tables correctly, but I'm not sure. Thanks in advance.

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