给Asp.Net初学者的关于继承和多态性的例子(1)

2022-07-15 80酷酷网 80kuku.com

　　asp.net|初学|继承    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>
";
   message.InnerHtml += "Firstname:"+profile.getFirstname()+"
";
   message.InnerHtml += "Lastname:"+profile.getLastname()+"
";
   message.InnerHtml += "Phone:"+profile.getPhonenumber()+"

";

   profile.save();

   ExtendedProfile extendedprofile = new ExtendedProfile();
   message.InnerHtml += "<u>ExtendedProfile Class</u></br>";
   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();
  }
  </script>
  <meta http-equiv="Content-Type" content="text/html; charset=gb2312">
  <title></title>
  </head>
  <body Helvetica, sans-serif ">
  <b><h3>简单的继承/多态例子</h3></b>

  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
  {
   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
   void save();
   }

   public class Profile:ISaveData //定义类Profile
   {
   protected string _firstname; //里面包含三个属性，分别为_firstname、_lastname、phonenumber
   protected string _lastname;
   protected string _phonenumber;

   public Profile() //为属性定义其中的初始值
   {
   _firstname = "Saidy";
   _lastname = "Chen";
   _phonenumber = "(010)88716990";
   }

   public string getPhonenumber() //Profile类中的方法getPhonenumber()
   {
   return _phonenumber;
   }
   public virtual void setPhonenumber(string phonenumber)
   {
   _phonenumber = phonenumber;
   }

   public string getFirstname() //Profile类中的方法getFirstname()
   {
   return _firstname;
   }
   public void setFirstname(string firstname)
   {
   _firstname = firstname;
   }

   public string getLastname() //Profile类中的方法getLastname()
   {
   return _lastname;
   }
   public void setLastname(string lastname)
   {
   _lastname = lastname;
   }

   public virtual void save() //调用ISaveData接口的save()方法
   {
   //保存数据为Text格式
   FileStream fs = new FileStream("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();
   }
  }