【Entity Framework】The ObjectContext might be in an inconsistent state

對資料庫的變更認可成功，但是在更新物件內容時發生錯誤。ObjectContext 可能處於不一致的狀態。
The changes to the database were committed successfully, but an error occurred while updating the object context. The ObjectContext might be in an inconsistent state. and so on.

我的問題是 edmx PKey 的設定跟 DB 的設定是不一致的，只要改 DB PKey 或更新 edmx 跟 DB為一致就 OK 了。

ref: StackOverFlow