温故知新ASP.NET 2.0(C#)(1) – MasterPage(母版页)-0编程日记

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” %>
<html xmlns=”http://www.w3.org/1999/xhtml”>
<head id=”Head1″ runat=”server”>
<title>重新过一遍ASP.NET 2.0(C#)</title>
</head>
<body>
<form id=”form1″ runat=”server”>
<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)
{

}

/**//// <summary>
/// 设置ddlMaster的选中索引
/// 这个方法由内容页调用
/// </summary>
/// <param name=”index”></param>
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(“<br />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);
}
}

[源码下载]

作者：webabcd