Beispielcode zu Vererbung und Polymorphismus-C#.Net-Tutorial-php.cn

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Beispielcode zu Vererbung und Polymorphismus

Jul 03, 2017 pm 05:09 PM

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

&lt;%@ Page Language=&quot;C#&quot; ContentType=&quot;text/html&quot; ResponseEncoding=&quot;gb2312&quot; Src=&quot;profile2.cs&quot; %&gt;
&lt;%@ Import Namespace=&quot;shai&quot; %&gt;
&lt;html&gt;
&lt;head&gt;
&lt;style&gt;
p{font:Arial, Helvetica, sans-serif;
background-color
:#cccccc;
border-color
:black;
border-width
:1;
border-style
:solid;
padding:10,10,10,10;
}
&lt;/style&gt;
&lt;script language=&quot;c#&quot; runat=&quot;server&quot;&gt;
public void Page_Load(Object sender,EventArgs e)
{
  Profile profile = new Profile();
  message.InnerHtml += &quot;&lt;u&gt;Profile Class&lt;/u&gt;&lt;br&gt;&quot;;
  message.InnerHtml += &quot;Firstname:&quot;+profile.getFirstname()+&quot;&lt;br&gt;&quot;;
  message.InnerHtml += &quot;Lastname:&quot;+profile.getLastname()+&quot;&lt;br&gt;&quot;;
  message.InnerHtml += &quot;Phone:&quot;+profile.getPhonenumber()+&quot;&lt;br&gt;&lt;br&gt;&quot;;
   profile.save();

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

  extendedprofile.save();
}
&lt;/script&gt;
&lt;meta http-equiv=&quot;Content-Type&quot; content=&quot;text/html; charset=gb2312&quot;&gt;
&lt;title&gt;&lt;/title&gt;
&lt;/head&gt;
&lt;body style=&quot;font:Arial, Helvetica, sans-serif &quot;&gt;
&lt;b&gt;&lt;h3&gt;简单的继承/多态例子&lt;/h3&gt;&lt;/b&gt;&lt;br&gt;&lt;br&gt;
object output:&lt;br&gt;
&lt;br&gt;
&lt;p id=&quot;message&quot; runat=&quot;server&quot; /&gt;
&lt;/body&gt;
&lt;/html&gt;

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 = &quot;Saidy&quot;;
   _lastname = &quot;Chen&quot;;
   _phonenumber = &quot;(010)88716990&quot;;
 }

 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(&quot;D:\\myweb2\\profile2.txt&quot;,FileMode.Create,FileAccess.Write);
   StreamWriter sw = new StreamWriter(fs);
   sw.WriteLine(&quot;Firstname:&quot;+_firstname.ToString());
   sw.WriteLine(&quot;Lastname:&quot;+_lastname.ToString());
   sw.WriteLine(&quot;Phone:&quot;+_phonenumber.ToString());
   sw.Flush();
   sw.Close();
   fs.Close();
  }
}

  public class ExtendedProfile:Profile        建立Profile子类ExtendedProfile，他可以继承Profile中的方法
  {
    protected string _address1;                  //子类ExtendedProfile的属性
    protected string _address2;
    protected string _city;
    protected string _state;
    protected string _postal;
    protected string _description;

 public ExtendedProfile()                      //子类ExtendedProfile中属性的初始值
 {
   _address1 = &quot;清华大学&quot;;
   _address2 = &quot;清华大学物理实验室&quot;;
   _city = &quot;北京&quot;;
   _state = &quot;北京&quot;;
   _postal = &quot;100024&quot;;
   _description = &quot;教授&quot;;
 }

 public override void setPhonenumber(string phonenumber)           //继承类Profile中的setPhonenumber()方法
 {                                                                                                 //setPhonenumber()方法的重载
   _phonenumber = phonenumber;
 }

 public string getAddress1()          //子类ExtendedProfile中的方法getAddress1()，以下类推
 {
   return _address1;
 }
 public string getAddress2() 
 {
   return _address2;
 }
 public void setAddress(string address1,string address2)
 {
   _address1 = address1;
   _address2 = address2;
 }

 public string getCity()
 {
   return _city;
 }
 public void setCity(string city)
 {
   _city = city;
 }

 public string getState()
 {
   return _state;
 }
 public void setState(string state)
 {
   _state = state;
 }

 public string getPostal()
 {
   return _postal;
 }
 public void setPostal(string postal)
 {
   _postal = postal;
 }

 public string getDescription()
 {
   return _description;
 }
 public void setDescription(string description)
 {
   _description = description;
 }

 public override void save()                //调用接口ISaveData()中的方法save()，save()方法的重载，由于多态性
 {                                                       //子类ExtendedProfile可以自定义并修改save()方法
   string _document = &quot;d:\\myweb2\\saidy.xml&quot;;
   XmlTextWriter writer = null;           //保存为一个Xml文件
   try
   {
    writer = new XmlTextWriter(_document,null);
    writer.Formatting = Formatting.Indented;
    writer.WriteStartDocument(false);
    writer.WriteDocType(&quot;Profile&quot;,null,null,null);            //表示&lt;!DOCTYPE Profile&gt;
    writer.WriteStartElement(&quot;Profile&quot;);                         //生成根元素   
    writer.WriteElementString(&quot;firstname&quot;,_firstname);   //生成子元素  &lt;firstname&gt;_firstname&lt;/firstname&gt;
    writer.WriteElementString(&quot;lastname&quot;,_lastname);
    writer.WriteElementString(&quot;phonenumber&quot;,_phonenumber);
    writer.WriteElementString(&quot;address1&quot;,_address1);
    writer.WriteElementString(&quot;address2&quot;,_address2);
    writer.WriteElementString(&quot;city&quot;,_city);
    writer.WriteElementString(&quot;state&quot;,_state);
    writer.WriteElementString(&quot;postal&quot;,_postal);
  writer.WriteEndElement();
  writer.Flush();
  writer.Close();
   }
   catch(Exception ee)
   {
     Console.WriteLine(&quot;Exception:{0}&quot;,ee.ToString());
   }
 }
}
}

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