在未先对具有同一属性名的同一更改跟踪器调用 EntityMemberChanging……

System.InvalidOperationException: 在未先对具有同一属性名的同一更改跟踪器调用 EntityMemberChanging 或 EntityComplexMemberChanging 之前，调用了 EntityMemberChanged 或 EntityComplexMemberChanged。有关正确报告更改的信息，请参阅 Entity Framework 文档。
在 System.Data.Objects.ObjectStateEntry.EntityValueChanged(String entityMemberName, Object complexObject, String complexObjectMemberName)
在 System.Data.Objects.ObjectStateEntry.System.Data.Objects.DataClasses.IEntityChangeTracker.EntityMemberChanged(String entityMemberName)


English translation（英文版）:
EntityMemberChanged or EntityComplexMemberChanged was called without first calling EntityMemberChanging or EntityComplexMemberChanging on the same change tracker with the same property name. For information about properly reporting changes, see the Entity Framework documentation.


请问怎么解决？