public delegate void WithParaWithReturn(string str); //有参数有返回值
/// <summary>
/// 二‘委托的使用
/// </summary>
public void Usage()
{
#region 调用无参数无返回值的委托
//委托的实例化
NoParaNoReturnOutClass method = new NoParaNoReturnOutClass(Example);
//委托实例的调用
method.Invoke();
//也可这样调用
method();
#endregion
#region 调用无参数有返回值的委托
NoParaWithReturn NoParaWithReturnMethod = new NoParaWithReturn(Examples);
//接收返回值
string result = NoParaWithReturnMethod.Invoke();
#endregion
#region 调用有参数无返回值的委托
WithParaNoReturn WithParaNoReturnMethod = new WithParaNoReturn(Example);
string str = string.Empty;
//传递参数
WithParaNoReturnMethod(str);
#endregion
#region 多播委托
NoParaNoReturn multicast = new NoParaNoReturn(Example);
//按顺序添加到方法列表
multicast += Example;
multicast += Example;
multicast += Example;
//从方法列表的尾部去掉且只去掉一个完全相同的方法
multicast -= Example;
#endregion
}
public static void show()
{
#region lesson1
// NoParaNoReturn method=new NoParaNoReturn(ShowSomething);//委托的实例化
// method.Invoke();//method(ShowSomething)
#endregion
NoParaWithReturn noParaWithReturn = new NoParaWithReturn(GetSomething);
System.Console.WriteLine("getsomething_first_invoke:{0}", noParaWithReturn.Invoke());
#region test2
// System.Console.WriteLine("getsomething_second_invoke:{0}",noParaWithReturn());
#endregion
#region lesson2
//多播委托
noParaWithReturn += GetSomething;
noParaWithReturn += GetSomething;
noParaWithReturn += GetSomething;
noParaWithReturn += GetSomething;
noParaWithReturn -= GetSomething;
#endregion
}
