100分---求如何在内容页动态更改母模板中一个div的背景图片？ ---给出代码，马上给分！

求如何在内容页动态更改母模板中一个div的背景图片？主要是我获取不到母模板中的 DIV,也无法找到background-image属性，所以无法更改该的背景图片，请高手解决！
非常感谢！

解决方案 »

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母版页:MasterPage.master
<%@ Master Language="C#" AutoEventWireup="true" CodeFile="MasterPage.master.cs" Inherits="MasterPage" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//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>
    <div id="div1" runat="server">the masterpage div here</div>
        <asp:contentplaceholder id="ContentPlaceHolder1" runat="server">
        </asp:contentplaceholder>
    </div>
    </form>
</body>
</html>
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;public partial class MasterPage : System.Web.UI.MasterPage
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }    public HtmlGenericControl TheDiv
    {
        get { return div1; }
        set { div1 = value; }
    }

}
引用页default12.aspx<%@ Page Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true" CodeFile="Default12.aspx.cs" Inherits="Default12" Title="Untitled Page" %>
<%@ MasterType TypeName="MasterPage" %>
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
    <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" />
</asp:Content>using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;public partial class Default12 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        this.Master.TheDiv.Style["background"] = "orange";
    }
}
竹子给的例子修改的是颜色,你设置图片也行,如
this.Master.TheDiv.Style["background"] = "url(img.jpg)";
母版页YourMasterPage.master ，中存在：<div id="div1" runat="server">your masterpage div </div>------------------------------------------
内容页中修改：((YourMasterPage)this.Master).div1.Style["background-image"] = "url(your.jpg)";
//-------剛才忘了設訪問div1的屬性了
母版页YourMasterPage.master   ，中存在：
<div   id="div1"   runat="server"> your   masterpage   div   </div>
-------------------------------------------
母版页YourMasterPage.master.cs   ，中存在：
public  Control MasterDiv1
{
        get { return this.div1; }
}
------------------------------------------
yourpage.aspx.cs内容页中修改：
((YourMasterPage)this.Master).MasterDiv1.Style["background-image"]   =   "url(your.jpg)";
说明: 在编译向该请求提供服务所需资源的过程中出现错误。请检查下列特定错误详细信息并适当地修改源代码。编译器错误信息: CS0122: “MainMaster.buydiv”不可访问，因为它受保护级别限制源错误: 行 14:     protected void Page_Load(object sender, EventArgs e)
行 15:     {
行 16:         ((MainMaster)this.Master).buydiv.Style["background-image"] = "url(images/2-1.gif)";
行 17:        // this.Master.mindexdiv.Style["background"] = "url(images/2-1.gif)";
行 18:     }
楼主如果按竹子的办法是绝对可行的,你不要尝试修改代码,完全COPY竹子的代码先试试再提问你不明白的问题.