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{font:Arial, Helvetica, sans-serif;
background-color:#cccccc;
border-color:black;
border-width:1;
border-style:solid;
padding:10,10,10,10;
}
</style>
<script language="c#" runat="server">
public void Page_Load(Object sender,EventArgs e)
{
Profile profile = new Profile();
message.InnerHtml += "<u>Profile Class</u><br>";
message.InnerHtml += "Firstname:"+profile.getFirstname()+"<br>";
message.InnerHtml += "Lastname:"+profile.getLastname()+"<br>";
message.InnerHtml += "Phone:"+profile.getPhonenumber()+"<br><br>";
profile.save();
ExtendedProfile extendedprofile = new ExtendedProfile();
message.InnerHtml += "<u>ExtendedProfile Class</u></br>";
message.InnerHtml += "Firstname:"+profile.getFirstname()+"<br>";
message.InnerHtml += "Lastname:"+profile.getLastname()+"<br>";
message.InnerHtml += "Phone:"+extendedprofile.getPhonenumber()+"<br>";
message.InnerHtml += "Address1:"+extendedprofile.getAddress1()+"<br>";
message.InnerHtml += "Address2:"+extendedprofile.getAddress2()+"<br>";
message.InnerHtml += "City:"+extendedprofile.getCity()+"<br>";
message.InnerHtml += "State:"+extendedprofile.getState()+"<br>";
message.InnerHtml += "Postal:"+extendedprofile.getPostal()+"<br>";
message.InnerHtml += "Description:"+extendedprofile.getDescription()+"<br>";
extendedprofile.save();
}
</script>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title></title>
</head>
<body style="font:Arial, Helvetica, sans-serif ">
<b><h3>简单的继承/多态例子</h3></b><br><br>
object output:<br>
<br>
<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
{
interface ISaveData //定义一个接口ISaveData，他作为Profile的基类被继承，由于其有多态性的特点，可以被
{ //不同类调用其中的方法，并修改
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