Entity Framework 4: How to find the primary key?

Question

I am trying to create a generic method using EF4 to find the primary key of an object.

example

public string GetPrimaryKey()
{
    ...
}
         


        

Answer 1

this seems needlessly long? I have had the same need, and using the suggestions above (by SethO and denis_n), i am using:

        //get the primary key field name and location for the table
        var primaryFieldName = entry.EntitySet.ElementType.KeyMembers[0].Name ;
        int primaryFieldLocation = entry.CurrentValues.GetOrdinal(primaryFieldName);
        //gets the value pair for the primary key (returns field name + value)
        var primaryField = entry.EntityKey.EntityKeyValues[primaryFieldLocation];
        String primaryFieldValue = primaryField.Value.ToString();

Hope this helps anyone who is interested