.net 委托的例子

一个基本的委托例子。

做一个乘法和除法。

        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("Enter 2 numbers separated with a comma:");
            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("Enter M to multiply or D to divide");
            input = Console.ReadLine();
            if (input == "M")
                process = new ProcessDelegate(Multiply);
            else
                process = new ProcessDelegate(Divide);
            Console.WriteLine("Result: {0}", process(param1, param2));
            Console.ReadKey();
        }

运行结果如下：