The method IsEmpty(String) is undefined for the type

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The method IsEmpty(String) is undefined for the type

The method IsEmpty(String) is undefined for the type
The method IsEmpty(String) is undefined for the type

The method IsEmpty(String) is undefined for the type
找不到IsEmpty(string)的方法 你的方法添加了吗?相应的包引进来了吗?

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