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[Source] An entity object cannot be referenced by more than one IEntityChangeTracker instance.

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Posted on 11/6/2017 12:53:10 PM | | | |


Excerpt from the CSDN:
Problem: After updating one of the fields of an object, it is updated into the database and this error is reported.
Solution: Retake the object from the database, update the fields to be changed, and save it to the database.

Excerpt from cnblog:
http://www.cnblogs.com/oneword/archive/2012/03/18/2404967.html ;

Excerpt from CSDN
http://blog.csdn.net/sb1ue/article/details/7024888 ;

The above methods are to find the original Entity entity object from the database again, and then perform the operation. However, such a method is not recommended. The cause of this issue is "there are multiple DBContext context objects in the current thread", which may be a new DBContext object every time you perform an operation in your DAL layer. The solution is to use singleton mode to ensure that there is only one DBContext object in the thread.




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