Just clear the fields for insert, update and delete that is located in Mapping Details for a given entity in your edmx, and it should work. This will also happen if you are trying to insert into a unique constraint situation, ie if you can only have one type of address per employer and you try to insert a second of that same type with the same employer, you will get the same problem.
OR This could also happen if all of the object properties that were assigned to, they were assigned with the same values as they had before.
The problem it turned out was caused by a Trigger on the table I was trying to save to.
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The solution was to truncate the milliseconds from Date Time. I got that error when I was deleting some rows in the DB (in the loop), and the adding the new ones in the same table.
The solutions for me was, to dynamicaly create a new context in each loop iteration If you are trying to create mapping in your edmx file to a "function Imports", this can result this error.
I got this same error because part of the PK was a datetime column, and the record being inserted used Date Time. Entity framework would insert the value with millisecond precision, and then look for the value it just inserted also with millisecond precision.
However Sql Server had rounded the value to second precision, and thus entity framework was unable to find the millisecond precision value.
Thus when the context went to save the data, it could not find an ID = 0.
Be sure to place a break point in your update statement and verify that the entity's ID has been set.
But it might have something to do with how close together I make the updates.
Has anyone seen this or does anyone know what the error message refers to?
i found that any errors during update were usually because of: - No primary key in Table - No primary key in Edit view/form (e.g.