多播委托

1  public delegate void M1Delegate();
2 
3     public delegate int M2Delegate(int x,int y);

 1 static int A1(int x,int y)
 2         {
 3             return x + y;
 4         }
 5 
 6         static int A2(int x, int y)
 7         {
 8             return x + y;
 9         }
10 
11         static int A3(int x, int y)
12         {
13             return x + y;
14         }
15 
16         static void M1() {
17             Console.WriteLine("这是M1方法");
18         }
19 
20         static void M2()
21         {
22             Console.WriteLine("这是M2方法");
23         }
24 
25         static void M3()
26         {
27             Console.WriteLine("这是M3方法");
28         }
29 
30         static void M4()
31         {
32             Console.WriteLine("这是M4方法");
33         }
34         
35 
36         static int N1(int x, int y)
37         {
38             return 10;
39         }
40 
41         static int N2(int x, int y)
42         {
43             return 20;
44         }
45 
46         static int N3(int x, int y)
47         {
48             return 30;
49         }

1             M1Delegate m1 = M1;
2             m1 += M2;
3             m1 += M3;
4             m1 += M4;
5 
6             m1 -= M1;
7             m1();

1  M1Delegate m1 = new M1Delegate(M1);
2             m1 = (M1Delegate)Delegate.Combine(m1, new M1Delegate(M2));
3             m1 = (M1Delegate)Delegate.Combine(m1, new M1Delegate(M3));
4             m1 = (M1Delegate)Delegate.Combine(m1, new M1Delegate(M4));
5             m1 = (M1Delegate)Delegate.Remove(m1, new M1Delegate(M2));
6             m1();

1  //这里，多播委托只能取到最后一次方法的值
2             M2Delegate m1 = A1;
3             m1 += A2;
4             m1 += A3;
5             int n = m1(100, 200);
6             Console.WriteLine(n);

1             M2Delegate m1 = A1;
2             m1 += N1;
3             m1 += N2;
4             m1 += N3;
5             int n = m1(100, 200);
6             Console.WriteLine(n);//这里，多播委托只能取到最后一次方法的值

 1 //如果让多播委托返回每个方法的值呢？
 2             M2Delegate m1 = A1;
 3             m1 += A1;
 4             m1 += A2;
 5             m1 += A3;
 6             Delegate[] dList = m1.GetInvocationList();
 7 
 8             foreach (var item in dList)
 9             {
10                 int n = ((M2Delegate)item)(11, 22);
11                 Console.WriteLine(n);
12             }