接着，调用此函数委托时，将调用指定实例的指定方法。

Then, when the function delegate is invoked the specified method of the specified instance is called.

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这构造器用来通过一个目标对象和一个函数指针形成一个委托。

The constructor is used to form a delegate over a target object and a function pointer.

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注意该处理器函数必须具备由委托定义的签名。

Note that the handler function must have the signature defined by the delegate.

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