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POHow to update non-scalar entity properties in EF 4.0?
 

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  1. POHow to update non-scalar entity properties in EF 4.0?
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    <p>At first I was using this as an extension method to update my detached entities...</p> <pre><code>Public Sub AttachUpdated(ByVal obj As ObjectContext, ByVal objectDetached As EntityObject) If objectDetached.EntityState = EntityState.Detached Then Dim original As Object = Nothing If obj.TryGetObjectByKey(objectDetached.EntityKey, original) Then obj.ApplyCurrentValues(objectDetached.EntityKey.EntitySetName, objectDetached) Else Throw New ObjectNotFoundException() End If End If End Sub </code></pre> <p>Everything has been working great until I had to update non-scalar properties. Correct me if I am wrong but that is because "ApplyCurrentValues" only supports scalars. To get around this I was just saving the FK_ID field instead of the entity object relation. Now I am faced with a many to many relationship so its not that simple. I would like to do something like this...</p> <pre><code>Dim Resource = RelatedResource.GetByID(item.Value) Condition.RelatedResources.Add(Resource) </code></pre> <p>But when I call SaveChanges the added Resources aren't saved. I started to play around with self-tracking entities (not sure if they will help solve my prob) but it seems they cannot be serialized to ViewState and this is a requirement for me.</p> <p>I guess one solution would be to add the xRef table as an entity and add the fks myself but I would rather it just work how I expect it too.</p> <p>I am open to any suggestions on how to either save my many to many relationships or serialize self-tracking entities (if self-trackingwould even solve my problem). Thanks!</p>
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