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POCannot insert explicit value for identity column
 

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    <p>I'm getting the above error when creating a new record. I don't want to insert the identity -- the database has it auto generated and that is great.</p> <p>Here is the exact exception:</p> <pre><code>[System.Data.UpdateException] {"An error occurred while updating the entries. See the inner exception for details."} {"Cannot insert explicit value for identity column in table 'PartRevisions' when IDENTITY_INSERT is set to OFF."} </code></pre> <p>Here are the mappings:</p> <pre><code>Public Class PartContext Inherits DbContext Public Property Parts As DbSet(Of Part) Public Property PartRevisions As DbSet(Of PartRevision) Protected Overrides Sub OnModelCreating(modelBuilder As DbModelBuilder) MyBase.OnModelCreating(modelBuilder) modelBuilder.Entity(Of PartRevision)().HasKey(Function(r) r.Id).Property(Function(r) r.Id).HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity) End Sub End Class &lt;Table("Parts")&gt; Public Class Part &lt;Key(), DatabaseGenerated(DatabaseGeneratedOption.Identity)&gt; Public Property Id As Integer Public Property PartNumber As String Public Property Owner As String End Class &lt;Table("PartRevisions")&gt; Public Class PartRevision Inherits Part Public Property OriginalId As Integer Public Property RevisionDate As DateTime Public Property RevisionNumber As Integer Public Property RevisionBy As String End Class </code></pre> <p>If I don't use inheritance it works fine. If I make Id overridable and also specify the attributes on the sub class it still doesn't work.</p> <p>I'm doing the <code>OnModelCreating</code> stuff just because I'm trying to get it to work. I feel like it should work without this. Of course it doesn't even work with this...</p> <p>The following query works fine when I execute it in SQL Management Studio:</p> <pre><code>insert into PartRevisions (originalid, revisiondate, revisionnumber, revisionby, partnumber, owner) values (1, '1/1/2013', 1, 'eep', '123', 'ME') </code></pre> <p>Here is a gist with the full program. I was trying this out in a test project because I assumed I'd run into some issues doing inheritance in EF (never done yet).</p> <p><a href="https://gist.github.com/eyston/4956444" rel="nofollow">https://gist.github.com/eyston/4956444</a></p> <p>Thanks!</p>
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