给Asp.Net初学者的关于继承和多态性的例子

(编辑：jimmy 日期: 2026/1/13 浏览：2)

本人学Asp.Net不久，用的是C#写代码，在学习C#中发现很多初学者对继承和多态性不是特别的了解，因此作了这个例子，希望对您有所帮助，例子很简单

页面文件TestProfileClass2.aspx
<%@ Page Language="C#" ContentType="text/html" ResponseEncoding="gb2312" Src="profile2.cs" %>
<%@ Import Namespace="shai" %>
<html>
<head>
<style>
div"c#" runat="server">
public void Page_Load(Object sender,EventArgs e)
"Profile Class ";
message.InnerHtml += "Firstname:"+profile.getFirstname()+" ";
message.InnerHtml += "Lastname:"+profile.getLastname()+" ";
message.InnerHtml += "Phone:"+profile.getPhonenumber()+" ";

profile.save();

ExtendedProfile extendedprofile = new ExtendedProfile();
message.InnerHtml += "ExtendedProfile Class";
message.InnerHtml += "Firstname:"+profile.getFirstname()+" ";
message.InnerHtml += "Lastname:"+profile.getLastname()+" ";
message.InnerHtml += "Phone:"+extendedprofile.getPhonenumber()+" ";
message.InnerHtml += "Address1:"+extendedprofile.getAddress1()+" ";
message.InnerHtml += "Address2:"+extendedprofile.getAddress2()+" ";
message.InnerHtml += "City:"+extendedprofile.getCity()+" ";
message.InnerHtml += "State:"+extendedprofile.getState()+" ";
message.InnerHtml += "Postal:"+extendedprofile.getPostal()+" ";
message.InnerHtml += "Description:"+extendedprofile.getDescription()+" ";

extendedprofile.save();
"Content-Type" content="text/html; charset=gb2312">
<title></title>
</head>
<body style="font:Arial, Helvetica, sans-serif ">
<h3>简单的继承/多态例子</h3> 
object output: 
 
<div id="message" runat="server" />
</body>
</html>

类定义文件profile2.cs
using System;
using System.IO;
using System.Xml;
namespace shai //名称空间shai
"Saidy";
 _lastname = "Chen";
 _phonenumber = "(010)88716990";
"D:\\myweb2\\profile2.txt",FileMode.Create,FileAccess.Write);
 StreamWriter sw = new StreamWriter(fs);
 sw.WriteLine("Firstname:"+_firstname.ToString());
 sw.WriteLine("Lastname:"+_lastname.ToString());
 sw.WriteLine("Phone:"+_phonenumber.ToString());
 sw.Flush();
 sw.Close();
 fs.Close();
"清华大学";
 _address2 = "清华大学物理实验室";
 _city = "北京";
 _state = "北京";
 _postal = "100024";
 _description = "教授";
"d:\\myweb2\\saidy.xml";
 XmlTextWriter writer = null; //保存为一个Xml文件
 try
 "Profile",null,null,null); //表示<!DOCTYPE Profile>
 writer.WriteStartElement("Profile"); //生成根元素
 writer.WriteElementString("firstname",_firstname); //生成子元素 <firstname>_firstname</firstname>
 writer.WriteElementString("lastname",_lastname);
 writer.WriteElementString("phonenumber",_phonenumber);
 writer.WriteElementString("address1",_address1);
 writer.WriteElementString("address2",_address2);
 writer.WriteElementString("city",_city);
 writer.WriteElementString("state",_state);
 writer.WriteElementString("postal",_postal);
writer.WriteEndElement();
writer.Flush();
writer.Close();
 "Exception:",ee.ToString());
 }
}
}
}

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