MVC4
The reason is that when the primary key is not modified entity class assignment
Modifying entity class error
Store update, insert, or delete statement affects the number of rows unexpected (0). Entities may be modified or removed after loading. Refresh ObjectStateManager items.
The reason is that when the primary key is not modified entity class assignment
Solution: The primary key field assignment
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Reproduced in: https: //www.cnblogs.com/kevinGao/p/4188725.html