委托初接触

 1 /*
 2  * Created by SharpDevelop.
 3  * User: llh
 4  * Date: 2014/5/12
 5  * Time: 17:31
 6  */
 7 using System;
 8 
 9 namespace DelegateTest
10 {
11     class Program
12     {
13         /// <summary>
14         /// 管理算术的委托
15         /// </summary>
16         delegate int MathDel(int a, int b);
17             
18         public static void Main(string[] args)
19         {
20             int a = 2, b = 3;
21             
22             //简单委托
23             MathDel mathDel = Math.Add;
24             var resu = mathDel(a, b);
25             Console.WriteLine(resu);
26                 
27             //术语：多播委托
28             //使用下面这种写法,会返回最后一个方法的返回值
29             mathDel += Math.Subtract;
30             resu = mathDel(a, b);
31             Console.WriteLine(resu);
32             
33             //委托数组
34             MathDel [] mathDelList = {
35                 Math.Add,
36                 Math.Subtract
37             };
38             Console.WriteLine(mathDelList[0](a, b));
39             
40             //绑定匿名方法
41             MathDel mathAnonymous = delegate(int v1, int v2) {
42                 return v1 * v2;
43             };
44             Console.WriteLine(mathAnonymous(a,b));
45     
46             //除了使用自定义委托外
47             //内置了两个委托,使用方法与普通的委托没区别
48             //有返回值(返回值类型为最后一个参数)
49             Func<int,int,int> func = Math.Add;
50             Console.WriteLine(func(a,b));
51             //无返回值
52             Action<String> action = Math.Pring;
53             Console.Write("Please input your name : ");
54             action(Console.ReadLine());
55             Console.ReadKey(true);
56         }
57     }
58     
59     /// <summary>
60     /// 算术就是它算的 <-
61     /// </summary>
62     public class Math
63     {
64         /// <summary>
65         /// 返回给定参数的和
66         /// </summary>
67         /// <param name="a"></param>
68         /// <param name="b"></param>
69         /// <returns></returns>
70         public static int Add(int a, int b)
71         {
72             return a + b;
73         }
74         /// <summary>
75         /// 返回给定参数的差
76         /// </summary>
77         /// <param name="a"></param>
78         /// <param name="b"></param>
79         /// <returns></returns>
80         public static int Subtract(int a, int b)
81         {
82             return a - b;
83         }
84         
85         /// <summary>
86         /// 输出 helloe! + 指定名称
87         /// </summary>
88         /// <param name="param"></param>
89         public static void Pring(String param){
90             Console.WriteLine("Hello!" + param);
91         }
92     }
93 }