VS2008(C#)子页嵌套母版页的控件访问方法（三）——嵌套三层母版页的子页
子页嵌套了三层母版页后，依次访问第一层、第二层、第三层母版页控件的实现方法如下：
第一层母版页HTML代码
<%@ Master Language="C#" AutoEventWireup="true" CodeFile="MasterPage.master.cs" Inherits="MasterPage_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>MasterPage</title>
<asp:ContentPlaceHolder ID="head" runat="server">
</asp:ContentPlaceHolder>
</head>
<body>
<form id="form1" runat="server">
<div>
第一层母版页
<br />
<asp:Label ID="Master_Label" runat="server" Text="母版页(Label)"></asp:Label>
<br />
<br />
<asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server">
</asp:ContentPlaceHolder>
</div>
</form>
</body>
</html>
第二层母版页HTML代码
<%@ Master Language="C#" MasterPageFile="~/MasterPage/MasterPage.master" AutoEventWireup="true"
CodeFile="MasterPage2.master.cs" Inherits="MasterPage_MasterPage2" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="Server">
<%--添加第二层母版页的子页内容--%>
<asp:ContentPlaceHolder ID="head2" runat="Server">
</asp:ContentPlaceHolder>
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server">
第二层母版页
<br />
<asp:Label ID="Master2_Label" runat="server" Text="母版页2（Label）"></asp:Label>
<br />
<br />
<%--添加第二层母版页的子页内容--%>
<asp:ContentPlaceHolder ID="ContentPlaceHolder2" runat="Server">
</asp:ContentPlaceHolder>
</asp:Content>
第三层母版页HTML代码
<%@ Master Language="C#" MasterPageFile="~/MasterPage/MasterPage2.master" AutoEventWireup="true"
CodeFile="MasterPage3.master.cs" Inherits="MasterPage_MasterPage3" %>
<%-- Add content controls here --%>
<%--定义第三层母版页的内容项--%>
<asp:Content ID="Content1" ContentPlaceHolderID="head2" runat="Server">
<asp:ContentPlaceHolder ID="head3" runat="Server">
</asp:ContentPlaceHolder>
</asp:Content>
<%--定义第三层母版页的内容项--%>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder2" runat="Server">
第三层母版页
<br />
<asp:Label ID="Master3_Label" runat="server" Text="母版页3（Label）"></asp:Label>
<br />
<br />
<asp:ContentPlaceHolder ID="ContentPlaceHolder3" runat="Server">
</asp:ContentPlaceHolder>
</asp:Content>
子页前台HTML代码
<%@ Page Title="" Language="C#" MasterPageFile="~/MasterPage/MasterPage3.master" AutoEventWireup="true" CodeFile="SubPage3.aspx.cs" Inherits="MasterPage_SubPage3" %>
<%-- Add content controls here --%>
<%--继承第三层母版页的正文内容--%>
<asp:Content ID="Content1" ContentPlaceHolderID="head3" runat="Server">
</asp:Content>
<%--继承第三层母版页的正文内容--%>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder3" runat="Server">
子页--333
<br />
<asp:Label ID="Sub3_Label" runat="server" Text="Label"></asp:Label>
<br />
<br />
<asp:Button ID="Button1" runat="server" Text="子页3访问母页3"
onclick="Button1_Click" />
<asp:Button ID="Button2" runat="server" Text="子页3注销母页3"
onclick="Button2_Click" />
<br />
<br />
<asp:Button ID="Button3" runat="server" Text="子页3访问母页2"
onclick="Button3_Click" />
<asp:Button ID="Button4" runat="server" Text="子页3注销母页2"
onclick="Button4_Click" />
<br />
<br />
<asp:Button ID="Button5" runat="server" Text="子页3访问母页1"
onclick="Button5_Click" />
<asp:Button ID="Button6" runat="server" Text="子页3注销母页1"
onclick="Button6_Click" />
<br />
</asp:Content>
子页后台CS代码
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class MasterPage_SubPage3 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
//访问第三层母板控件
//登陆
protected void Button1_Click(object sender, EventArgs e)
{
//从第三层得到第一层的ContentPlaceHolder，来访问其中的控件（此时已为第二层）
ContentPlaceHolder cpMaster1 = (ContentPlaceHolder)Master.Master.Master.FindControl("ContentPlaceHolder1");
//第一层母板找到第二层母板的ContentPlaceHolder，来访问其中的控件（此时已为第三层）
ContentPlaceHolder cpMaster2 = (ContentPlaceHolder)cpMaster1.FindControl("ContentPlaceHolder2");
Label m3Label = (Label)cpMaster2.FindControl("Master3_Label");
m3Label.Text = "子页3 - 访问母版页3";
}
//注销
protected void Button2_Click(object sender, EventArgs e)
{
//从第三层得到第一层的ContentPlaceHolder，来访问其中的控件（此时已为第二层）
ContentPlaceHolder cpMaster1 = (ContentPlaceHolder)Master.Master.Master.FindControl("ContentPlaceHolder1");
//第一层母板找到第二层母板的ContentPlaceHolder，来访问其中的控件（此时已为第三层）
ContentPlaceHolder cpMaster2 = (ContentPlaceHolder)cpMaster1.FindControl("ContentPlaceHolder2");
Label m3Label = (Label)cpMaster2.FindControl("Master3_Label");
m3Label.Text = "母版页3(Label)";
}
//访问第二层母板控件
//登陆
protected void Button3_Click(object sender, EventArgs e)
{
//从第三层得到第一层的ContentPlaceHolder，来访问其中的控件（此时已为第二层）
ContentPlaceHolder cpMaster1 = (ContentPlaceHolder)Master.Master.Master.FindControl("ContentPlaceHolder1");
Label m2Label = (Label)cpMaster1.FindControl("Master2_Label");
m2Label.Text = "子页3 - 访问母版页2";
}
//注销
protected void Button4_Click(object sender, EventArgs e)
{
//从第三层得到第一层的ContentPlaceHolder，来访问其中的控件（此时已为第二层）
ContentPlaceHolder cpMaster1 = (ContentPlaceHolder)Master.Master.Master.FindControl("ContentPlaceHolder1");
Label m2Label = (Label)cpMaster1.FindControl("Master2_Label");
m2Label.Text = "母版页2(Label)";
}
//访问第一层母板控件
//登陆
protected void Button5_Click(object sender, EventArgs e)
{
Label mLabel = (Label)Master.Master.Master.FindControl("Master_Label");
mLabel.Text = "子页3 - 访问母版页1";
}
//注销
protected void Button6_Click(object sender, EventArgs e)
{
Label mLabel = (Label)Master.Master.Master.FindControl("Master_Label");
mLabel.Text = "母版页1(Label)";
}
}