Loading partial entities with Linq to Entities

问题

I am trying to load a partial entity with Linq to Entities:

Dim contacts = From c In My.Context.Contacts _
     Select New Contact With { _
         .ContactId = c.ContactId, _
         .Name = c.Name
     }

I tried it and I get the following NotSupportedException: "The entity or complex type 'CompleteKitchenModel.Contact' cannot be constructed in a LINQ to Entities query."

Thanks

回答1:

You'll have to use anonymous type:

Dim contacts = From c In My.Context.Contacts _
 Select New With { _
     .ContactId = c.ContactId, _
     .Name = c.Name
 }

and then copy data to Contact list:

For Each contact In contacts    
     Dim c As New Contact With { .ContactId = c.ContactId, .Name = c.Name}
     //Add to list
Next

Your syntax, as error says, is not supported.

来源：https://stackoverflow.com/questions/2011100/loading-partial-entities-with-linq-to-entities