委托和事件

 1         /// <summary>
 2         /// 定义委托
 3         /// </summary>
 4         /// <param name="x">变量 x</param>
 5         /// <param name="y">变量 y</param>
 6         /// <returns>返回一个 Int 值</returns>
 7         public delegate int IntDelegate(int x, int y);
 8         
 9         /// <summary>
10         /// Add 静态方法
11         /// </summary>
12         /// <param name="x">参数 x</param>
13         /// <param name="y">参数 y</param>
14         /// <returns>返回 Int 值</returns>
15         public static int Add(int x, int y)
16         {
17             return x + y;
18         }
19 
20         /// <summary>
21         /// 入口函数
22         /// </summary>
23         /// <param name="args"></param>
24         public static void Main(string[] args)
25         {
26             IntDelegate delegt = new IntDelegate(Add);
27             Console.WriteLine(delegt.Invoke(3, 9));
28         }

 1         /// <summary>
 2         /// 实例化委托类
 3         /// </summary>
 4         public static void Test2()
 5         {
 6             IntDelegate delegt = delegate(int x, int y) { return x + y; };
 7             Console.WriteLine(delegt(4, 10));
 8         }
 9 
10         /// <summary>
11         /// 在上面的方法的基础上去掉 delegate
12         /// </summary>
13         public static void Test3()
14         {
15             IntDelegate delegt = (int x, int y) => { return x + y; };
16             Console.WriteLine(delegt.Invoke(4, 50));
17         }
18 
19         /// <summary>
20         /// 在上面的方法的基础上去掉 delegate 和 return 
21         /// </summary>
22         public static void Test4()
23         {
24             IntDelegate delegt = (x, y) => (x + y);
25             Console.WriteLine(delegt.Invoke(4, 50));
26         }

 1         /// <summary>
 2         /// Add 静态方法
 3         /// </summary>
 4         /// <param name="x">参数 x</param>
 5         /// <param name="y">参数 y</param>
 6         /// <returns>返回 Int 值</returns>
 7         public static int Add(int x, int y)
 8         {
 9             return x + y;
10         }
11 
12         /// <summary>
13         /// Func 的使用,第三个Int 是返回值类型
14         /// </summary>
15         public static void Test5()
16         {
17             Func<int, int, int> func = (x, y) => Add(x, y);
18             Console.WriteLine(func.Invoke(102, 204));
19         }

 1         /// <summary>
 2         /// Sub 静态方法
 3         /// </summary>
 4         /// <param name="x"></param>
 5         /// <param name="y"></param>
 6         public static void Sub(int x, int y)
 7         {
 8             Console.WriteLine(x - y);
 9         }
10 
11         /// <summary>
12         /// Action 的使用
13         /// </summary>
14         public static void Test6()
15         {
16             Action<int, int> action = Sub;
17             action.Invoke(101, 94);
18         }