日期:2014-05-19  浏览次数:20428 次

请教大家一个小问题
我是ASP.NET的初学者,我按照书上的例子试做一个程序,,,功能是选择不同的单选按钮显示不同的图片,,,可是不知道是哪里出了问题,,,选择按钮后图片不发生变化,请大家帮忙看看,,,下面是代码
using   System;
using   System.Collections;
using   System.ComponentModel;
using   System.Data;
using   System.Drawing;
using   System.Web;
using   System.Web.SessionState;
using   System.Web.UI;
using   System.Web.UI.WebControls;
using   System.Web.UI.HtmlControls;

namespace   Webxx2
{
///   <summary>
///   WebForm1   的摘要说明。
///   </summary>
public   class   WebForm1   :   System.Web.UI.Page
{
protected   System.Web.UI.WebControls.RadioButtonList   RadioButtonList1;
protected   System.Web.UI.WebControls.Image   Image1;

private   void   Page_Load(object   sender,   System.EventArgs   e)
{
//   在此处放置用户代码以初始化页面
Image1.ImageUrl=RadioButtonList1.Items[0].Value;

}

#region   Web   窗体设计器生成的代码
override   protected   void   OnInit(EventArgs   e)
{
//
//   CODEGEN:   该调用是   ASP.NET   Web   窗体设计器所必需的。
//
InitializeComponent();
base.OnInit(e);
}

///   <summary>
///   设计器支持所需的方法   -   不要使用代码编辑器修改
///   此方法的内容。
///   </summary>
private   void   InitializeComponent()
{        
this.RadioButtonList1.SelectedIndexChanged   +=   new   System.EventHandler(this.RadioButtonList1_SelectedIndexChanged);
this.Load   +=   new   System.EventHandler(this.Page_Load);

}
#endregion

private   void   RadioButtonList1_SelectedIndexChanged(object   sender,   System.EventArgs   e)
{
Image1.ImageUrl=RadioButtonList1.SelectedItem.Value;

}
}
}

还有HTML代码
<%@   Page   language= "c# "   Codebehind= "WebForm1.aspx.cs "   AutoEventWireup= "false "   Inherits= "Webxx2.WebForm1 "   %>
<!DOCTYPE   HTML   PUBLIC   "-//W3C//DTD   HTML   4.0   Transitional//EN "   >
<HTML>
<HEAD>
<title> WebForm1 </title>
<meta   name= "GENERATOR "   Content= "Microsoft   Visual   Studio   .NET   7.1 ">
<meta   name= "CODE_LANGUAGE "   Content= "C# ">
<meta   name= "vs_defaultClientScript "   content= "JavaScript ">
<meta   name= "vs_targetSchema "   content= "http://schemas.microsoft.com/intellisense/ie5 ">
</HEAD>
<body   MS_POSITIONING= "GridLayout ">
<form   id= "Form1 "   method= "post "   runat= "server ">
<asp:RadioButtonList   id= "RadioButtonList1 "   style= "Z-INDEX:   101;   LEFT:   112px;   POSITION:   absolute;   TOP:   104px "
runat= "server ">
<asp:ListItem   Value= "add.jpg "   Selected= "True "> image1 </asp:ListItem>
<asp:ListItem   Value= "BaseItemInout.jpg "> image2 </asp:ListItem>
<asp:ListItem   Value=