为什么在C＃中我们需要对象发送者作为参数事件处理程序？

Question

I would like to know why we need the object sender as a parameter while we can pass it using the eventargs object like below:

SpecialEvent(this,new SpecialEventArgs(..));
void Func(object _sender,SpecialEventArgs _e){}

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SpecialEvent(new SpecialEventArgs(this,..));
void Func(SpecialEventArgs _e){}

Thx

Answer 1

What if you bind that event handler to multiple buttons? It would be nice to see which button invoked the handler. There is no value in moving this reference into the event args.