介绍
母版页（MasterPage）就相当于模板页，挺简单的，没什么好说的。基于母版页的常用的功能有：母版页和内容页之间信息的传递，在内容页中用FindControl方法找到内容页中的控件等。另外，母版页是可以嵌套的。

关键
在内容页的头部加上母版页的强类型引用

<%--创建对母版页的强类型引用，并指定到母版页的虚拟路径--%>

<%@ MasterType VirtualPath="~/MasterPage/MasterPage.master" %>

1、内容页传递数据到母版页 - 母版页创建一个公共方法，然后内容页通过“Master.方法”来调用这个公共方法

2、母版页传递数据到内容页 - 母版页创建一个公共事件来传递数据，然后内容页处理这个事件

3、内容页中用FindControl方法找到内容页中的控件 - 用“Master.FindControl("ContentPlaceHolder1").FindControl("你要查找的控件ID")”来查找

4、嵌套母版页 - 说起来麻烦，看源码吧

示例
主母板页
Site.master

<%@ Master Language="C#" AutoEventWireup="true" CodeFile="Site.master.cs" Inherits="Site" %>

<title>重新过一遍ASP.NET 2.0(C#)title>

head>

<body>

<div>

<asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server">

asp:ContentPlaceHolder>

div>

form>

body>

html>

次母板页
MasterPage/MasterPage.master

<%@ Master Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true"

CodeFile="MasterPage.master.cs" Inherits="MasterPage_MasterPage" %>

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server">

<p>

我是一个嵌套母版页

p>

<p>

母版页中的内容

<asp:DropDownList ID="ddlMaster" runat="server" DataSourceID="XmlDataSource1" DataTextField="text"

DataValueField="value" AutoPostBack="True" OnSelectedIndexChanged="ddlMaster_SelectedIndexChanged">

asp:DropDownList><asp:XmlDataSource ID="XmlDataSource1" runat="server" DataFile="~/Config/DropDownListData.xml">

asp:XmlDataSource>

p>

<p>

内容页中的内容

<asp:ContentPlaceHolder ID="cph" runat="Server" />

p>

asp:Content>

MasterPage/MasterPage.master.cs

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_MasterPage : System.Web.UI.MasterPage

{

protected void Page_Load(object sender, EventArgs e)

{

}

///

/// 设置ddlMaster的选中索引

/// 这个方法由内容页调用

///

public void SetddlMaster(int index)

{

ddlMaster.SelectedIndex = index;

}

protected void ddlMaster_SelectedIndexChanged(object sender, EventArgs e)

{

// ddlMaster的选中索引改变后，激发SelectedIndexChanged_ddlMaster事件

SelectedIndexChanged_ddlMaster(this, new CommandEventArgs(ddlMaster.SelectedItem.Text, ddlMaster.SelectedValue));

}

// 声明一个公共时间事件，让内容页用

public event CommandEventHandler SelectedIndexChanged_ddlMaster;

}

内容页
MasterPage/Test.aspx

<%@ Page Language="C#" MasterPageFile="~/MasterPage/MasterPage.master" AutoEventWireup="true"

CodeFile="Test.aspx.cs" Inherits="MasterPage_Test" Title="MasterPage测试" %>

<%--创建对母版页的强类型引用，并指定到母版页的虚拟路径--%>

<%@ MasterType VirtualPath="~/MasterPage/MasterPage.master" %>

<asp:Content ID="Content1" ContentPlaceHolderID="cph" runat="Server">

<asp:dropdownlist id="ddlPage" runat="server" datasourceid="XmlDataSource1" datatextfield="text"

datavaluefield="value" autopostback="True" onselectedindexchanged="ddlPage_SelectedIndexChanged">

asp:dropdownlist>

<asp:xmldatasource id="XmlDataSource1" runat="server" datafile="~/Config/DropDownListData.xml">

asp:xmldatasource>

asp:Content>

MasterPage/Test.aspx.cs

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_Test : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

// 在内容页用FindControl方法找到内容页中的控件

DropDownList ddl = new DropDownList();

ddl = Master.Master.FindControl("ContentPlaceHolder1").FindControl("cph").FindControl("ddlPage") as DropDownList;

Master.Master.FindControl("ContentPlaceHolder1").FindControl("cph").Controls.Add(new LiteralControl("内容页中的DropDownList的ClientID是：" + ddl.ClientID));

// 增加一个事件处理，该事件是在母版页定义的一个公共事件

Master.SelectedIndexChanged_ddlMaster += new CommandEventHandler(Master_SelectedIndexChanged_ddlMaster);

}

void Master_SelectedIndexChanged_ddlMaster(object sender, CommandEventArgs e)

{

// CommandEventArgs已经在母版页中的公共事件“SelectedIndexChanged_ddlMaster”中指定

string selectedText = e.CommandName;

string selectedValue = e.CommandArgument.ToString();

ddlPage.SelectedValue = selectedValue;

}

protected void ddlPage_SelectedIndexChanged(object sender, EventArgs e)

{

// 调用母版页的方法

Master.SetddlMaster(ddlPage.SelectedIndex);

}

ITPub博客

【webabcd】温故知新ASP.NET 2.0(C#)(1) - MasterPage(母版页)

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