Codeusing System;
using System.Collections.Generic;
using System.Text;
namespace DelegateDemo
{
class Class1
{
delegate double processDelegate(double db1, double db2);
static double Multiply(double db1, double db2)
{
return db1 * db2;
}
static double Divide(double db1, double db2)
{
return db1 / db2;
}
static void NamedMethod(string strInput,double dbNum1,double dbNum2)
{
processDelegate process;
if (strInput == "M")
process = new processDelegate(Multiply);
else
process = new processDelegate(Divide);
Console.WriteLine("结果为：{0}", process(dbNum1, dbNum2));
}
static void AnonymousMethod(string strInput, double dbNum1, double dbNum2)
{
processDelegate process;
if (strInput == "M")
process = delegate(double db1, double db2){return db1 * db2;};
else
process = delegate(double db1, double db2) { return db1 / db2; };
Console.WriteLine("结果为：{0}", process(dbNum1, dbNum2));
}
/// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main(string[] args)
{
//
// TODO: 在此处添加代码以启动应用程序
Console.WriteLine("请输入两个小数，用逗号分割");
string strInput = Console.ReadLine();
int commmaPos = strInput.IndexOf(',');
double dbNum1 = Convert.ToDouble(strInput.Substring(0, commmaPos));
double dbNum2 = Convert.ToDouble(strInput.Substring(commmaPos + 1));
Console.WriteLine("输入M表示乘法，或者D表示除法");
strInput = (Console.ReadLine()).ToUpper();
//使用命名方法
Console.WriteLine("使用命名方法委托");
NamedMethod(strInput,dbNum1,dbNum2);
//使用匿名方法
Console.WriteLine("使用匿名方法委托");
AnonymousMethod(strInput, dbNum1, dbNum2);
}
}
}