Error: The number of unexpected rows affected by the storage area update, insert, or delete Statement (0 ). Objects may be modified or deleted after being loaded.

Mvc4

An error is reported when modifying the object class.

Error Description: The number of unexpected rows affected by the storage area update, insert, or delete Statement (0 ). Objects may be modified or deleted after being loaded. Refresh the objectstatemanager item.

After checking, it is found that the data update cannot find the update item, that is, there is no primary key.

Solution: assign values to the primary key of the object. This is form return, so the hidden domain return method is used.

Which of the above two methods can be used?

Error: The number of unexpected rows affected by the storage area update, insert, or delete Statement (0 ). Objects may be modified or deleted after being loaded.