有一些概念是看过一次记得，久不接触就忘了的，但是以后要重新捡起，又要花些时间看书，所以记下来为了巩固。
1. 申明Deleagate：其实背后是IL编译器为你创造了一个封装函数指针的类，这个类名就是你申明时所用的函数名，例如Delegate void AddDelegate(int, int)。winForm技术中喜欢将AddDelegate称为AddEventHandler，所以也就有了那么多EventHandler。
2. 申明Event:：当Event和前面申明的委托，也就是AddEventHandler联合申明一个事件，例如 public event AddEventHandler addevent， 这个IL编译出来的的是包含函数指针列表的类实例。而addevent()调用，就变成函数列表的调用，官方文字称诸多订阅该事件的委托实例的调用。所以订阅的语句：addevent+= new AddEventHandler(clientDimAdd) ，也就是将这个回调函数加入到列表中，以便事件触发时依次调用。
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