static void Main(string[] args)
{
//建立委托链
var cb = new CallBack(CallBackAdd1);
cb += CallBackAdd2;
cb += CallBackAdd3;
cb += CallBackAdd4;
cb += CallBackAdd5;
var sum = cb(0);
//只会收到最后一个含有返回值的委托的返回值，前面的都白做了，输出错误答案5
Console.WriteLine(sum);
//通过GetInvocationList方法得到委托链上的所有方法
var list = cb.GetInvocationList();
var i = 0;
foreach (var del in list)
{
//显式呼叫方法
//静态方法不需要object
i = (int)del.Method.Invoke(null, new object[] { i });
}
//正确答案15
Console.WriteLine(i);
Console.ReadKey();
}
/// <summary> 入口方法： 注册获取 </summary>
public void Register(int index = 0)
{
this._callBackHandle += Report;
bool isRegistered = _callBackHandle == null ? false : _callBackHandle.GetInvocationList().ToList().Exists(l => l.Method.Name == "Report");
if (!isRegistered)
{
this._callBackHandle += Report;
}
EnumWindows(_callBackHandle, index);
}