C# 函数重载

方法重载，在C#中通过虚函数来实现，具体做法：现在父类中用virtual将其声明为虚函数，然后在子类中用override关键字来指定该函数为重载函数。重载函数必须具有父类函数中的参数个数，参数类型和返回类型。

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> --> using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace MethodOverride
{
     public   enum  Genders { 
        Female = 0 ,
        Male = 1
    }
     public   class  Person {
         protected  string _name;
         protected   int  _age;
         protected  Genders _gender;
         public  Person() {
             this ._name  =   " default name " ;
             this ._age  =   20 ;
             this ._gender  =  Genders.Male;
        }
         public  virtual  void  IntroduceMyself() {
            System.Console.WriteLine( " introduce myself " );
        }
    }

     public   class  ChinesePerson : Person {
         public  ChinesePerson() : base() {
             this ._name  =   " default Chinese Name " ;            
        }
         public  override  void  IntroduceMyself()
        {
            System.Console.WriteLine( " 我叫{0},年龄{1},性别{2} " , this ._name, this ._age, this ._gender);
        }
    }

     public   class  EnglishPerson : Person
    {
         public  EnglishPerson(): base()
        {
             this ._name  =   " default English Name " ;
        }
         public  override  void  IntroduceMyself()
        {
            System.Console.WriteLine( " My Name is{0},my age is {1},my gender is {2} " ,  this ._name,  this ._age,  this ._gender);
        }
    }

     class  Program
    {
         static   void  Main(string[] args)
        {
            Person aPerson  =   new  Person();
            aPerson.IntroduceMyself();
            aPerson  =   new  ChinesePerson();
            aPerson.IntroduceMyself();
            aPerson  =   new  EnglishPerson();
            aPerson.IntroduceMyself();
            System.Console.ReadLine();
        }
    }
}

结果如下：
introduce myself
我叫default Chinese Name,年龄20,性别Male
My Name isdefault English Name,my age is 20,my gender is Male