没有可以提供给“<var>X</var>”的代理类型的元数据信息。从 ObjectContext 分离实体的代理类型时，可能会引发此异常。有关详细信息，请参见 InnerException。

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There is no metadata information available for the proxy type for '<var>X</var>'. This exception can be caused when a proxy type for an entity is detached from an ObjectContext. See InnerException for details.

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