C#委托的实例

//命名委托
//声明了一个委托，下一步需要实例化
public delegate void MyDelegate();

public class Person
{
public static void SayHello()
{

     Console.WriteLine("Hello World");
     //委托实例化
     MyDelegate Dale = new MyDelegate(SayHello);
     //调用
     Dale();
 }

}

---

多播委托

public delegate void MyDelegate();

public class Person
{
public static void SayHello()
{

    MyDelegate MyDele = new MyDelegate(Order.BuyFood);
    MyDele = MyDele + Order.BuyBeef;
    MyDele += Order.BuyFish;
    MyDele -= Order.BuyFood;
    MyDele();
  
}

}

class Order
{

public static void BuyFish()
{

    Console.WriteLine("你购买了一条鱼");

}

public static void BuyFood()
{

    Console.WriteLine("你购买了食物");


}

public static void BuyCoco()
{

    Console.WriteLine("你购买了奶茶");

}

public static void BuyBeef()
{

    Console.WriteLine("你购买了牛肉");

}

}

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匿名委托

public delegate void AreaDelegate(double length, double width);

Console.WriteLine("输入长度:");
double length = double.Parse(Console.ReadLine());
Console.WriteLine("输入宽度");
double width = double.Parse(Console.ReadLine());
//定义匿名委托
AreaDelegate area = delegate
{

double area = length * width;
Console.WriteLine(area);

};
//调用匿名委托
area(length, width);