一个C#类的简单了实例

using System;

using System.Data;

using System.Configuration;

using System.Collections;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;

public partial class lei : System.Web.UI.Page

{

    public class
book

       
{

           
private string name; 
//在此声明了book类的一个私有变量

           
private string price; //同上

       
public book() 
//在此声明了book类的一个默认的构造函数

       
{

           
name="asp完全自学手册";

           
price = "58";

       
}

        

           
public string Name //在此声明了一个Name属性
此属性使name变量的值可以在对象外对其赋值

           
{

               
get     
//属性的只读方法

               
{

                   
return name;

               
}

               
set  
//属性的读写权限

               
{

                   
name=value;

               
}

                  

           
}

             
public string Price //price属性的读写权限
price属性有写权限

             
{

             
get

             
{

                 
return price;

             
}

              
set

              
{

                  
price = value;

              
}

             
}

           
public string getinfo(string a, string b ) 
//声明一个方法

           
{

               
string c=""; 
//局部变量，外部不可访问

               
c="书的名称是:" +
a+"<br>书的价格是:"+b;

               
return c;

           
}

       
}

    protected
void Page_Load(object sender, EventArgs e)

    {

       
int i = 0;

       
book onebook = new book();
//声明了onebook对象，此对象是book类的实例

       
onebook.Name =
"asp.net2.0教程";//为onebook的Name属性赋值

       
onebook.Price = "58.5";//Price赋值

       
string a=onebook.Name.ToString();

       
string b=onebook.Price.ToString();

       
string c=onebook.getinfo(a,b)
;//调用book类的getinfo方法，并添入两个值

       
Response.Write(c + "<br>");
//输出结果结果为
"书的名称是:asp.net教程<br>书的价格是:58.5

       
book onebook2 = new book(); 
//声明了onebook2对象，此对象是book类的实例

       
string a2 = onebook2.Name.ToString();
//book类的默认构造函数

       
string b2 = onebook2.Price.ToString();//同上

       
string c2 = onebook2.getinfo(a2, b2);
//调用book类的getinfo方法，并添入两个值

       
Response.Write(c2);  //输出结果结果为
"书的名称是:asp完全自学手册<br>书的价格是:58

     

    }

}