C#委托Code

 class Program
    {
        delegate double ProcessDelegate(double param1, double param2);

        static double Multiply(double param1, double param2)
        {
            return param1 * param2;
        }

        static double Divide(double param1, double param2)
        {
            return param1 / param2;
        }

        static void Main(string[] args)
        {
            ProcessDelegate process;
            Console.WriteLine("输入两个数以逗号隔开:");
            string input = Console.ReadLine();
            int commaPos = input.IndexOf(',');

            double param1 = Convert.ToDouble(input.Substring(, commaPos));
            double param2 = Convert.ToDouble(input.Substring(commaPos + ,input.Length - commaPos - ));

            Console.WriteLine("输入 M 进行乘法 或者 D 进行除法:");
            input = Console.ReadLine();
            if (input == "M")
            //process = new ProcessDelegate(Multiply);
            {
                //委托的第一种写法
                process = Multiply;
              //  process(param1, param2);
            }
            else
                //委托的第二种写法
                process = new ProcessDelegate(Divide);
            Console.WriteLine("结果: {0}", process(param1, param2));
            Console.ReadKey();
        }
    }

此代码为《C#入门经典》源码有进行学习后，发表到博客里，为提醒以后使用！