1 using System;
2 using System.Collections.Generic;
3 using System.Linq;
4 using System.Text;
5 using System.Threading.Tasks;
6
7 namespace 委托2
8 {
9 class Program
10 {
11 /// <summary>
12 /// 声明委托: 委托的返回值类型、参数类型、参数个数必须与被委托函数保持一致。
13 /// </summary>
14 /// <param name="x"> 参与运算的数据 </param>
15 /// <param name="y"> 参与运算的数据 </param>
16 /// <returns></returns>
17 delegate double Calculate(double x, double y);
18 static void Main(string[] args)
19 {
20 Console.WriteLine( "委托: Add 运算结果: {0}", DoCal(Add, 5, 2) );
21 Console.WriteLine( "委托: Sub 运算结果: {0}", DoCal(Sub, 6, 3) );
22 Console.WriteLine( "委托: Mul 运算结果: {0}", DoCal(Mul, 10, 2) );
23 Console.WriteLine( "委托: Dev 运算结果: {0}", DoCal(Dev, 20, 2) );
24
25 Console.ReadLine();
26 }
27
28 /// <summary>
29 /// 执行运算
30 /// </summary>
31 /// <param name="cal"> 委托类型形参 </param>
32 /// <param name="x"> 参与运算的数据 </param>
33 /// <param name="y">参与运算的数据 </param>
34 /// <returns> 返回被委托函数的运算结果 </returns>
35 static double DoCal(Calculate cal, double x, double y)
36 {
37 return cal(x, y);
38 }
39 // 加法
40 static double Add(double x, double y)
41 {
42 return x + y;
43 }
44 // 减法
45 static double Sub(double x, double y)
46 {
47 return x - y;
48 }
49 // 乘法
50 static double Mul(double x, double y)
51 {
52 return x * y;
53 }
54 // 除法
55 static double Dev(double x, double y)
56 {
57 return x / y;
58 }
59
60 }
61 }
