我如何解决这个问题 [英] How I Solve This Problem

问题描述

我的代码。

my code.

var chk = (from c in FMS.Depositers where c.RecepitNo == DepositNo select c).FirstOrDefault();
                      
                       chk.DepositStatus = "PreClosed"
                       gt.ApplyCurrentValues(chk.EntityKey.EntitySetName, chk);
                      
                       gt.SaveChanges();

显示错误信息。

showing error msg like this.

An object with a key that matches the key of the supplied object could not be found in the ObjectStateManager. Verify that the key values of the supplied object match the key values of the object to which changes must be applied.

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