【Notes】委托的示例

 1 class Program
 2     {
 3         delegate double ProcessDelegate(double param1, double param2);//定义一个double型的委托
 4         static double Multiply(double param1, double param2)
 5         {
 6             return param1 * param2;
 7         }
 8         static double Divide(double param1, double param2)
 9         {
             return param1 / param2;
         }
 
         static void Main(string[] args)
         {
             
             Console.WriteLine("Please enter two number:");
             string input = Console.ReadLine();
             int commaPos = input.IndexOf(',');//获取索引
             double param1 = Convert.ToDouble(input.Substring(0, commaPos));
             double param2 = Convert.ToDouble(input.Substring(commaPos + 1, input.Length - 1-commaPos));
             //询问是否相乘还是想除？
             Console.WriteLine("Please enter M to Multiply or D to Divide:");
             string input1=Console.ReadLine();
             if (input1 == "M")
             {
                 process = new ProcessDelegate(Multiply);//初始化委托变量
             }
             else
             {
                 process = new ProcessDelegate(Divide);
             }
             Console.WriteLine("Result:{0}", process(param1,param2));        
             Console.ReadKey();
             
         }
     }