从具体化“<var>X</var>”类型到可以为 null 的“<var>Y</var>”类型的指定强制转换无效。 - unlocalize.com

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

从具体化“<var>X</var>”类型到可以为 null 的“<var>Y</var>”类型的指定强制转换无效。

Unlocalized message

The specified cast from a materialized '<var>X</var>' type to a nullable '<var>Y</var>' type is not valid.

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