对于 Nullable<<var>X</var>> 类型，IsNullable 不能为“false”。请考虑使用“<var>X</var>”类型或将 IsNullable 属性从 <var>Y</var> 特性中移除。

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IsNullable may not be set to 'false' for a Nullable<<var>X</var>> type. Consider using '<var>X</var>' type or removing the IsNullable property from the <var>Y</var> attribute.

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