当发生事件时，委托调用绑定的方法。

When the event occurs, the delegate calls the bound method.

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当一个引用被绑定到一个服务或这个服务被一个新的服务替换时，将调用绑定回调方法。

A bind callback is invoked when the reference is initially bound to a backing service, and whenever the backing service is replaced by a new backing service.

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当您的代码绑定到类型引用(包括函数指针引用和方法调用)时，就会进行链接。

Linking occurs when your code is bound to a type reference, including function pointer references and method calls.

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