多播委托 简介 每一个委托都是继承自MulticastDelegate,也就是每个都是多播委托。带返回值的多播委托只返回最后一个方法的值多播委托可以用加减号来操作方法的增加或者减少。
//声明委托
delegate void MulticastTest();
public class MulticastDelegateTest
{
public void Show()
{
MulticastTest multicastTest = new MulticastTest(MethodTest);
multicastTest();
Action action =new Action(MethodTest);
action = (Action)MulticastDelegate.Combine(action, new Action(MethodTest2));
action = (Action)MulticastDelegate.Combine(action, new Action(MethodTest3));
action = (Action)MulticastDelegate.Remove(action, new Action(MethodTest3));
action();
//等同于上面
action = MethodTest;
action += MethodTest2;
action += MethodTest3;
action -= MethodTest3;
foreach (Action action1 in action.GetInvocationList())
{
action1();
}
Console.WriteLine("==========");
action();
Func<string> func = () => { return "我是Lambda"; };
func += () => { return "我是func1"; };
func += () => { return "我是func2"; };
func += GetTest;
func += GetTest; //给委托传递相同方法时 生成的委托实例也是相同的(也就是同一个委托)
string result = func();
Console.WriteLine(result);
Console.WriteLine("==========");
}
#region 委托方法
public void MethodTest()
{
Console.WriteLine("我是方法MethodTest()1");
}
public void MethodTest2()
{
Console.WriteLine("我是方法MethodTest()2");
}
public void MethodTest3()
{
Console.WriteLine("我是方法MethodTest()3");
}
public string GetTest()
{
return "我是方法GetTest()";
}
#endregion
}
//泛型委托声明
delegate void GenericDelegate<T>(T t);
public class GenericDelegate
{
public static void InvokeDelegate()
{
GenericDelegate<string> genericDelegate = new GenericDelegate<string>(Method1);
genericDelegate("我是泛型委托1");
//官方版本(不带返回值)
Action<string> action = new Action<string>(Method1);
action("我是泛型委托1");
//Action<string, string, string, string, string, string, string, string, string, string, string, string, string, string, string, string>
GenericDelegate<int> genericDelegate1 = new GenericDelegate<int>(Method2);
genericDelegate1(2);
//官方版本(带回值)
Func<string, string> func = new Func<string, string>(Method3);
string ret = func("我是带返回值Func委托");
Console.WriteLine( ret );
//Func<string, string, string, string, string, string, string, string, string, string, string, string, string, string, string, string,string>
}
#region 委托方法
public static void Method1(string str)
{
Console.WriteLine(str);
}
public static void Method2(int num)
{
Console.WriteLine("我是泛型委托2 "+num);
}
public static string Method3(string str )
{
return str;
}
#endregion
}
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本文标题: C#中的多播委托和泛型委托
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