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(0, commaPos));            double param2 = Convert.ToDouble(input.Substring(commaPos + 1,input.Length - commaPos - 1));            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！