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                兩大作用: (1)將方法當作參數傳遞 (2)方法的一種多態(類似于一個方法模板,可以匹配很多個方法) ~~~text //定義一個委托 public delegate int MyDelegate(int x, int y); //與委托匹配的一個方法 public static int Add(int a, int b) { return a + b; } //與委托匹配的另一個方法 public static int Reduce(int a, int b) { return a - b; } //示例:將委托/方法當參數傳遞 public static int Test(MyDelegate MD) { return MD(10, 20); } static void Main(string[] args) { int a, b, x, y; MyDelegate md; //將委托指向Add這個方法,并進行相關操作 md = Add; a = md(1, 2); b = Test(md); //再將委托指向Reduce這個方法,并進行相關操作 md = Reduce; x = md(7, 2); y = Test(md); Console.WriteLine($"1+2={a},10+20={b},7-2={x},10-20={y}"); Console.ReadLine(); } ~~~ 輸出:1+2=3,10+20=30,7-2=5,10-20=-10
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