Для сущности передано недопустимое значение EntityState. Значение EntityState должно быть одним из следующих: Added, Deleted, Detached, Modified или Unchanged.

Message in Russian (Русский)

Unlocalized message

The EntityState value passed for the entity is not valid. The EntityState value must be one of the following: Added, Deleted, Detached, Modified, or Unchanged.

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