自定义控件学习笔记（四）

自定义控件学习笔记（三）－－如何获取客户提交数据

1。要点

1）继承接口IPostBackDataHandler

2）重写LoadPostData

3）在LoadPostData中，通过postCollection[postDataKey]获取客户的提交

2。控件

using System;
using System.Web.UI;
using System.Collections.Specialized;


namespace TestCustomControl
... {
publicclassDealPostBackData:Control,IPostBackDataHandler
...{
privatestringtext="";

publicstringText
...{
get...{returntext;}
set...{text=value;}
}

protectedoverridevoidRender(HtmlTextWriterwriter)
...{
writer.WriteBeginTag("input");
writer.WriteAttribute("name",UniqueID);

if(ID!=null)
...{
writer.WriteAttribute("id",ClientID);


}

if(text.Length>0)
...{
writer.WriteAttribute("value",text);


}

writer.Write(HtmlTextWriter.TagRightChar);

writer.WriteEndTag("input");


}

publicboolLoadPostData(stringpostDataKey,NameValueCollectionpostCollection)
...{
text=postCollection[postDataKey];
returnfalse;
}

publicvoidRaisePostDataChangedEvent()
...{
}
}
}

3。用法

前台

 
 

  
  
 
    
    
   <% 
   ... 
   @PageLanguage="C#"AutoEventWireup="true"CodeFile="DealPostBackData.aspx.cs"Inherits="TestCustomControl_First_DealPostBackData" 
   %> 
   
 
   <% 
   ... 
   @RegisterAssembly="DealPostBackData"TagPrefix="Surance"Namespace="TestCustomControl" 
   %> 
   
 
   <! 
   DOCTYPEhtmlPUBLIC"-//W3C//DTDXHTML1.0Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" 
   > 
   

 
   < 
   html 
   xmlns 
   ="http://www.w3.org/1999/xhtml" 
    
   > 
   
 
   < 
   head 
   runat 
   ="server" 
   > 
   
 
   < 
   title 
   > 
   无标题页 
   </ 
   title 
   > 
   
 
   </ 
   head 
   > 
   
 
   < 
   body 
   > 
   
 
   < 
   form 
   id 
   ="form1" 
   runat 
   ="server" 
   > 
   
 
   < 
   div 
   > 
   
 
   < 
   Surance:DealPostBackData 
   ID 
   ="D1" 
   runat 
   ="server" 
   Text 
   ="TypeSomething" 
    
   /> 
   
 
   < 
   asp:Button 
   ID 
   ="B1" 
   Text 
   ="Click" 
   runat 
   ="server" 
   OnClick 
   ="B1_Click" 
    
   /> 
   
 
   </ 
   div 
   > 
   
 
   </ 
   form 
   > 
   
 
   </ 
   body 
   > 
   
 
   </ 
   html 
   > 
  
 
 

后台：

protected void B1_Click( object sender,EventArgse)
... {
Response.Write(this.D1.Text);
}