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POLinq to SQL - Failing to update
 

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    <p>I'm having some troubles with updating linq to sql entities. For some reason, I can update every single field of my <code>item</code> entity besides <em>name</em>.</p> <p>Here are two simple tests I wrote:</p> <pre><code> [TestMethod] public void TestUpdateName( ) { using ( var context = new SimoneDataContext( ) ) { Item item = context.Items.First( ); if ( item != null ) { item.Name = "My New Name"; context.SubmitChanges( ); } } } [TestMethod] public void TestUpdateMPN( ) { using ( var context = new SimoneDataContext( ) ) { Item item = context.Items.First( ); if ( item != null ) { item.MPN = "My New MPN"; context.SubmitChanges( ); } } } </code></pre> <p>Unfortunately, TestUpdateName() fails with the following error: <code>System.Data.SqlClient.SqlException: Incorrect syntax near the keyword 'WHERE'..</code></p> <p>And here's the outputted SQL:</p> <blockquote> <p>UPDATE [dbo].[Items] SET WHERE ([Id] = @p0) AND ([CategoryId] = @p1) AND ([MPN] = @p2) AND ([Height] = @p3) AND ([Width] = @p4) AND ([Weight] = @p5) AND ([Length] = @p6) AND ([AdministrativeCost] = @p7) -- @p0: Input Int (Size = 0; Prec = 0; Scale = 0) [1] -- @p1: Input Int (Size = 0; Prec = 0; Scale = 0) [1] -- @p2: Input VarChar (Size = 10; Prec = 0; Scale = 0) [My New MPN] -- @p3: Input Decimal (Size = 0; Prec = 5; Scale = 3) [30.000] -- @p4: Input Decimal (Size = 0; Prec = 5; Scale = 3) [10.000] -- @p5: Input Decimal (Size = 0; Prec = 5; Scale = 3) [40.000] -- @p6: Input Decimal (Size = 0; Prec = 5; Scale = 3) [30.000] -- @p7: Input Money (Size = 0; Prec = 19; Scale = 4) [350.0000] -- Context: SqlProvider(Sql2008) Model: AttributedMetaModel Build: 3.5.30729.4926</p> </blockquote> <p>As you can see, no update is being generated (SET is empty ...) I have no clue why is this happening.</p> <p>And already in advance ... YES, the table <code>Item</code> has a PK (Id). <em>Thank you</em> in advance!</p> <p><b>Update:</b> It appears that the error is caused by overriding GetHashcode(). This is my current implementation:</p> <p><code> return string.Format( "{0}|{1}|{2}|{3}", Name, Id, UPC, AdministrativeCost).GetHashCode( ); </code></p>
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    1. COwhat happens if you modify Name and one other property? Does it update both or just the other property? Also in the generated code is the setter on Name firing the `PropertyChanged` event? I don't think the DataContext considers it a change unless the event is fired.
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    2. COIf I modify name and another property, only the other property changes.
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