細心的朋友可能發(fā)現，C#雖然可以重載操作符，但和C++比較起來(lái)，卻有很大的不同。定義的時(shí)候重載操作符方法必須是static，而且至少有一個(gè)參數（一目和二目分別是一個(gè)和兩個(gè)），C#和C++比起來(lái)，最重要的特征是：<、>；==、!=；true、false必須成對出現，即重載了“<”就必須重載“>”，重載了“==”就必須重載“！=”，重載了“true”就必須重載“false”；另外，還必須實(shí)現基類(lèi)object的兩個(gè)虛方法：GetHashCode()和Equals(object obj)。
以下是程序代碼，有些地方寫(xiě)得不完善，只能說(shuō)僅僅說(shuō)明了問(wèn)題，不對之處請指教：
using System;
using System.Xml;
namespace ConsoleApplication8
{
/// <summary>
/// 姓名類(lèi)
/// </summary>
class Namer
{
private string FirstName;
private string LastName;
public Namer()
{
this.Init(null,null);
}
public Namer(string fn,string ln)
{
this.Init(fn,ln);
}
private void Init(string fn,string ln)
{
this.FirstName=fn;
this.LastName=ln;
}
/// <summary>
/// 重載運算符true
/// </summary>
/// <param name="n"></param>
/// <returns>如果姓名中姓或名有一個(gè)為空，就返回假</returns>
public static bool operator true(Namer n)
{
if(n.FirstName==null || n.LastName==null)
return false;
else
return true;
}
/// <summary>
/// 重載運算符false
/// </summary>
/// <param name="n"></param>
/// <returns></returns>
public static bool operator false(Namer n)
{
if(n.FirstName==null || n.LastName==null)
return false;
else
return true;
}
/// <summary>
/// 重載運算符==
/// </summary>
/// <param name="n1"></param>
/// <param name="n2"></param>
/// <returns></returns>
public static bool operator ==(Namer n1,Namer n2)
{
if(n1.FirstName==n2.FirstName && n1.LastName==n2.LastName)
return true;
else
return false;
}
/// <summary>
/// 重載運算符！=
/// </summary>
/// <param name="n1"></param>
/// <param name="n2"></param>
/// <returns></returns>
public static bool operator !=(Namer n1,Namer n2)
{
if(n1.FirstName!=n2.FirstName || n1.LastName !=n2.LastName)
return true;
else
return false;
}
/// <summary>
/// 重載運算符>
/// </summary>
/// <param name="n1"></param>
/// <param name="n2"></param>
/// <returns></returns>
public static bool operator >(Namer n1,Namer n2)
{
return (n1.FirstName.CompareTo(n2.FirstName)>0 && n1.LastName.CompareTo(n2.LastName)>0);
}
/// <summary>
/// 重載運算符<
/// </summary>
/// <param name="n1"></param>
/// <param name="n2"></param>
/// <returns></returns>
public static bool operator <(Namer n1,Namer n2)
{
return (n1.FirstName.CompareTo(n2.FirstName)<0 && n1.LastName.CompareTo(n2.LastName)<0);
}
/// <summary>
/// 重寫(xiě)方法，必須有,后面的111是亂加的，你也可以寫(xiě)其它的
/// </summary>
/// <returns></returns>
public override int GetHashCode()
{
return base.GetHashCode()*111;
}
/// <summary>
/// 重寫(xiě)方法，必須有
/// </summary>
/// <param name="obj"></param>
/// <returns></returns>
public override bool Equals(object obj)
{
return base.Equals (obj);
}
/// <summary>
/// 重寫(xiě)方法，必須有
/// </summary>
/// <returns></returns>
public override string ToString()
{
return "姓:"+this.FirstName+" 名:"+this.LastName;
}
public static void Main()
{
Namer n1=new Namer("li","zanhong");
Namer n2=new Namer("ahang","aan");
//Namer n2=new Namer("li","zanhong");
if(n1==n2)
Console.WriteLine("一樣的名字");
else
Console.WriteLine("不一樣的名字");
/////////////////////////////////////
if(n1!=n2)
Console.WriteLine("不一樣的名字成立");
else
Console.WriteLine("同樣的名字成立");
/////////////////////////////////////
if(n1>n2)
Console.WriteLine(n1.ToString()+">"+n2.ToString());
else if(n1<n2)
Console.WriteLine(n1.ToString()+"<"+n2.ToString());
else
Console.WriteLine("沒(méi)有正確比較");
Console.ReadLine();
}
}
}
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