无法使用类型“<var>Type Name</var>”上的属性“<var>Property Name</var>”，因为实体集“<var>X</var>”没有为它指定关联集。

Message in Chinese (Simplified) (中文(简体))

Unlocalized message

Navigation property '<var>Property Name</var>' on type '<var>Type Name</var>' cannot be used because the entity set '<var>X</var>' does not have an association set specified for it.

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