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;
}

}
}