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POEntity Framework - An item with the same key has already been added. - Error when trying to define foreign key relationship
 

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  1. POEntity Framework - An item with the same key has already been added. - Error when trying to define foreign key relationship
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    <p>I have an entity with a foreign key relationship to an asp.net membership provider users table.</p> <p>This portion of the model looks like this:</p> <p><img src="https://i.stack.imgur.com/sQFsL.png" alt="alt text"></p> <p>I can't seem to assign the foreign key relationship when inserting the Users table record, the record containing the foreign key to the <code>aspnet_Users</code> table. I keep getting the error: </p> <blockquote> <p>An item with the same key has already been added.</p> </blockquote> <p>The code I'm using looks like:</p> <pre><code>UserAdmin userToAdd = new UserAdmin(); ... userToAdd.aspnet_Users = membershipUser; //line above OR line below userToAdd.aspnet_UsersReference.EntityKey = new System.Data.EntityKey("ProjectEntities.aspnet_Users", "UserId", membershipUser.UserId); db.AddToUsers(userToAdd); db.SaveChanges(); </code></pre> <p>Is the issue that I'm asking the EF to add a new <code>aspnet_Users</code> table record (the record for the associated primary key table) when that record is already there?</p> <p>How would I assign a foreign key value to an entity where the primary key record already exists?</p> <p>Updated test code block:</p> <pre><code>MembershipUser membershipUser = Membership.CreateUser("blah@blah.com", "pass", "blah@blah.com"); Entities db = new Entities(); UserAdmin newUser = new UserAdmin(); newUser.Name = "blah"; newUser.DateAdded = DateTime.Now; Guid key = new Guid(membershipUser.ProviderUserKey.ToString()); aspnet_Users membershipUserRecord = db.aspnet_Users.Where(u =&gt; u.UserId == key).FirstOrDefault(); newUser.aspnet_Users = membershipUserRecord; //newUser.aspnet_UsersReference.EntityKey = new System.Data.EntityKey("Entities.aspnet_Users", "UserId", membershipUserRecord.UserId); db.ObjectStateManager.ChangeObjectState(membershipUserRecord, EntityState.Unchanged); db.AddToUsers(newUser); db.SaveChanges(); </code></pre> <p>This code generates the error:</p> <blockquote> <p>An item with the same key has already been added.</p> </blockquote>
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    1. USBrooklynDev
    1. USBrooklynDev
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      1. POEntity Framework - An item with the same key has already been added. - Error when trying to define foreign key relationship
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      1. VTUpMod
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      1. POEntity Framework - An item with the same key has already been added. - Error when trying to define foreign key relationship
      1. USAlex
      1. VTFavorite
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      1. POEntity Framework - An item with the same key has already been added. - Error when trying to define foreign key relationship
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      1. VTUpMod
    1. COIs `membershipUser` tracked by the (same) DataContext?
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      1. POEntity Framework - An item with the same key has already been added. - Error when trying to define foreign key relationship
      1. USHenk Holterman
    2. COYes the membershipUser record was retrieved by the same entity model instance as is being used to commit the new User record.
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      1. POEntity Framework - An item with the same key has already been added. - Error when trying to define foreign key relationship
      1. USBrooklynDev
 

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