If you want to maintain a single instance of a variable for all instances of a class, you will use static-class member variables to do it.

如果您想为一个类的所有实例维持一个变量的实例，将会用到静态类成员变量。

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Specifies that one or more declared member variables refer to an instance of a class that can raise events.

指定一个或多个已声明成员变量引用可引发事件的类的实例。

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Specifies that one or more declared member variables refer to an instance of a class that can raise events.

指定一个或多个已声明成员变量引用可引发事件的类的实例。

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