C#委托实例

// 委托使用例子
// 节选自《C#入门经典》


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace weituo
{
    class Program
    {
        static void Main(string[] args)
        {
            // 声明委托变量
            ProcessDelegate process;
            Console.WriteLine("请输入用逗号分隔的两个数字：");
            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乘法D除法");
            input =Console.ReadLine();

            // 初始化委托变量
            if(input =="M")
                process = new ProcessDelegate(Multiply);
                //注释：此处也可以写process = Multiply
            else 
                process = new ProcessDelegate(Divide);

            // 使用委托调用函数
            double result = process(param1,param2);
            Console.WriteLine("结果:{0}",result);
            Console.ReadKey();

        }

        // 声明委托
        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;
        }

    }
}