C# 高级编程 里面的委托例子。
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication1
{
public class Currency
{
public uint Dollars;
public ushort Cents;
public Currency()
{
}
public Currency(uint dollars,ushort cents)
{
this.Dollars = dollars;
this.Cents = cents;
}
public override string ToString()
{
return string.Format("{0:c}.{1,-2:00}", Dollars, Cents);
}
public static string GetCurrencyUint()
{
return "人民币";
}
public static explicit operator Currency(float value)
{
checked
{
uint dollars = (uint)value;
ushort cents =(ushort) ((value - dollars)*100);
return new Currency(dollars, cents);
}
}
public static implicit operator float(Currency value)
{
return value.Dollars + value.Cents / 100.0f;
}
public static implicit operator Currency(uint value)
{
return new Currency(value, 0);
}
public static implicit operator uint(Currency value)
{
return value.Dollars;
}
}
delegate string GetAString();
class Program
{
static void Main(string[] args)
{
int x = 40;
GetAString firstStringMethod = x.ToString;
Console.WriteLine("String is {0}",firstStringMethod());
Currency balance = new Currency(34, 50);
firstStringMethod = balance.ToString;
Console.WriteLine("String is {0}", firstStringMethod());
firstStringMethod = new GetAString(Currency.GetCurrencyUint);
Console.WriteLine("String is {0}",firstStringMethod());
}
}
}
//
// /* 以下是运行的结果. String is 40 String is ￥34.50 String is 人民币请按任意键继续. . . */
