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POLinq to Sql: ChangeConflictException not being thrown (and no rows updated/deleted)
 

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  1. POLinq to Sql: ChangeConflictException not being thrown (and no rows updated/deleted)
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    <p>I'm trying to fit Linq to Sql into an N-Tier design. I am implementing concurrency by supplying original values when attaching objects to the data-context. When calling SubmitChanges, and observing the generated scripts on sql server profiler, I can see that they are being generated properly. They include where clauses that check all the object properties (they are all marked with UpdateCheck.Always).</p> <p>The result is as expected, i.e., no rows are updated on updates or deleted on deletes. Yet I am not getting any exception. Isn't this supposed to throw a ChangeConflictException?</p> <p>For clarity here is the design and flow for the tests I'm running: I have a client console and a service console talking to each other via WCF using WsHttpBinding.</p> <ol> <li>Client requests data from service </li> <li>Service instantiates a datacontext, retrieves data, disposes context, returns data to client. </li> <li>Client makes modifications to returned data. </li> <li>Client requests an update of changed data from the service.<br> 5a. Service instantiates a datacontext, attaches objects, and...<br> 5b. I pause execution and change values in the database in order to cause a change-conflict<br> 5c. Service calls SubmitChanges. </li> </ol> <p>Here's the code for step 5, cleaned up a bit for clarity:</p> <pre><code>public void UpdateEntities(ReadOnlyChangeSet&lt;Entity&gt; changeSet) { using (EntityDataContext context = new EntityDataContext()) { if (changeSet.AddedEntities.Count &gt; 0) { context.Entities.InsertAllOnSubmit(changeSet.AddedEntities); } if (changeSet.RemovedEntities.Count &gt; 0) { context.Entities.AttachAll(changeSet.RemovedEntities, false); context.Entities.DeleteAllOnSubmit(changeSet.RemovedEntities); } if (changeSet.ModifiedRecords.Count &gt; 0) { foreach (var record in changeSet.ModifiedRecords) { context.Entities.Attach(record.Current, record.Original); } } // This is where I pause execution and make changes to the database context.SubmitChanges(); } } </code></pre> <p>I'm using some classes to track changes and maintain originals, as you can see.</p> <p>Any help appreciated.</p> <p>EDIT: I'm having no problems with inserts. I've only included the code that calls InsertAllOnSubmit for completeness.</p>
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