C# asp.net 母版页嵌套

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如何做一个嵌套的母版页：

1.新建一个父母版页

<%@ Master Language="C#" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><script runat="server"></script><html xmlns="http://www.w3.org/1999/xhtml"><head runat="server">    <title></title>    <asp:ContentPlaceHolder ID="head" runat="server">    </asp:ContentPlaceHolder></head><body>    <form id="form1" runat="server">    <div id="banner">        <img src="image/banner.jpg" width="780px" height="150px" alt="banner graphic" />    </div>    <div>        <asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server">        </asp:ContentPlaceHolder>    </div>    <div id="footer">        <img src="image/footer.jpg" width="780px" height="50px" alt="footer graphic" />    </div>    </form></body></html>

2.新建一个子母版页，选择父母版页为母版

<%@ Master Language="C#" MasterPageFile="~/ParentMaster.master" %><script runat="server"></script><asp:Content ID="Content1" ContentPlaceHolderID="head" runat="Server"></asp:Content><asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server">    <div id="2col">    子母版页        <asp:ContentPlaceHolder ID="leftcolumn" runat="server">        </asp:ContentPlaceHolder>        <asp:ContentPlaceHolder ID="rightcolumn" runat="server">        </asp:ContentPlaceHolder>    </div></asp:Content>

3.在子母版页中添加代码：

        <asp:ContentPlaceHolder ID="leftcolumn" runat="server">        </asp:ContentPlaceHolder>        <asp:ContentPlaceHolder ID="rightcolumn" runat="server">        </asp:ContentPlaceHolder>

4.添加内容页，注意把ContentPlaceHolder的id改为子母版页中对应id

<%@ Page Title="" Language="C#" MasterPageFile="~/ChildMaster.master" AutoEventWireup="true" CodeFile="Tasks.aspx.cs" Inherits="Tasks" %><asp:Content ID="leftcolumn" ContentPlaceHolderID="leftcolumn" Runat="Server">内容页</asp:Content><asp:Content ID="rightcolumn" ContentPlaceHolderID="rightcolumn" Runat="Server">内容页</asp:Content>

参考：http://msdn.microsoft.com/zh-cn/library/bb547109(v=vs.100).aspx