Message in Chinese (Simplified) (中文(简体))
“<var>X</var>”未包含“<var>Y</var>”的定义，并且找不到可接受第一个“<var>X</var>”类型参数的扩展方法“<var>Y</var>”(是否缺少 using 指令或程序集引用?)
Unlocalized message
'<var>X</var>' does not contain a definition for '<var>Y</var>' and no extension method '<var>Y</var>' accepting a first argument of type '<var>X</var>' could be found (are you missing a using directive or an assembly reference?)
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