无法检索关系“<var>X</var>”的元数据信息。请确保已在程序集中定义关系的 EdmRelationshipAttribute。

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Metadata information for the relationship '<var>X</var>' could not be retrieved. If mapping attributes are used, make sure that the EdmRelationshipAttribute for the relationship has been defined in the assembly. When using convention-based mapping, metadata information for relationships between detached entities cannot be determined.

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