母版页嵌套子母版页通信

来源：互联网发布：如何开一家淘宝店铺编辑：程序博客网时间：2024/04/28 16:03

vs2005开始就已经有支持母版页了，常常我们在应用的过程当中会需要嵌套多个母版页，因为它实在是好用。

这就出现了母版页嵌套子母版页的状况，那么继承自子母版页的内容页需要与其通信的问题就接踵而至。

举例说明：前提母版页MasterPage.master，子母版页ChildPage.master，含有一GridView控件，继承自MasterPage.master的内容页Index.aspx，继承自ChildPage.master的内容页ContentPage.aspx。

目标：内容页ContentPage.aspx调用ChildPage.master的GridView控件并初始化（内容页与嵌套母版页的通信）。

1、母版页MasterPage.master代码：

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

<!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 id="Head1" runat="server">
<title></title>
</head>
<body leftmargin="0" topmargin="0">
<form id="form1" runat="server">
<div align="center">
<table width="763" height="100%" border="0" cellpadding="0" cellspacing="0" bgcolor="#FFFFFF">
<tr>
<td width="763" valign="top">
<asp:ContentPlaceHolder ID="ContentPlaceHolderMain" runat="server">
</asp:ContentPlaceHolder>
</td>
</tr>
</table>
</div>
</form>
</body>
</html>

2、子母版页ChildPage.master（继承自MasterPage.master）页面代码：

<%@ Master Language="C#" AutoEventWireup="true" CodeFile="ChildPage.master.cs" Inherits="ChildPage" MasterPageFile="~/MasterPage.master" %>

<asp:Content ContentPlaceHolderID="ContentPlaceHolderMain" runat="server">
<table width="910" border="0" cellpadding="0" cellspacing="0" align="center">
<tr>
<td style="width: 910px">
<table width="899" height="374" border="0" align="center" cellpadding="0" cellspacing="0">
<tr>
<td valign="top" style="width: 246px">
<table width="215" border="0" cellpadding="0" cellspacing="0" style="height: 26px"
id="TABLE1">
<tr>
<td>
<div style="text-align: center; margin-left: 30px;" mce_style="text-align: center; margin-left: 30px;">
<asp:GridView ID="gv_ChildMenu" runat="server" AutoGenerateColumns="False" Width="100%"
GridLines="None" OnRowDataBound="gv_ChildMenu_RowDataBound">
<Columns>
<asp:TemplateField SortExpression="Newtitle">
<ItemTemplate>
<asp:LinkButton runat="server" ID="linkBtn_Nav" Text='<%# Eval("ChildMenuName") %>' OnClick="linkBtn_Nav_Click"
Font-Size="10pt" Font-Bold="true" ForeColor=" #3e3f41"></asp:LinkButton>
</ItemTemplate>
<ItemStyle VerticalAlign="top" HorizontalAlign="left" CssClass="gvBorder" />
</asp:TemplateField>
</Columns>
<RowStyle HorizontalAlign="Center" Height="30px" Width="30px" VerticalAlign="middle"
Font-Underline="false" />
<HeaderStyle Height="0px" />
</asp:GridView>
</div>
</td>
</tr>
</table>
</td>
<td colspan="2" valign="top">
<p>
<asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server">
</asp:ContentPlaceHolder>
</p>
</td>
</tr>
</table>
</td>
</tr>
</table>
</asp:Content>

<%@ Master Language="C#" AutoEventWireup="true" CodeFile="ChildPage.master.cs" Inherits="ChildPage"    MasterPageFile="~/MasterPage.master" %><asp:Content ContentPlaceHolderID="ContentPlaceHolderMain" runat="server">    <table width="910" border="0" cellpadding="0" cellspacing="0" align="center">        <tr>            <td style="width: 910px">                <table width="899" height="374" border="0" align="center" cellpadding="0" cellspacing="0">                    <tr>                        <td valign="top" style="width: 246px">                            <table width="215" border="0" cellpadding="0" cellspacing="0" style="height: 26px"                                id="TABLE1">                                <tr>                                    <td>                                        <div style="text-align: center; margin-left: 30px;" mce_style="text-align: center; margin-left: 30px;">                                            <asp:GridView ID="gv_ChildMenu" runat="server" AutoGenerateColumns="False" Width="100%"                                                GridLines="None" OnRowDataBound="gv_ChildMenu_RowDataBound">                                                <Columns>                                                    <asp:TemplateField SortExpression="Newtitle">                                                        <ItemTemplate>                                                            <asp:LinkButton runat="server" ID="linkBtn_Nav" Text='<%# Eval("ChildMenuName") %>' OnClick="linkBtn_Nav_Click"                                                                Font-Size="10pt" Font-Bold="true" ForeColor=" #3e3f41"></asp:LinkButton>                                                        </ItemTemplate>                                                        <ItemStyle VerticalAlign="top" HorizontalAlign="left" CssClass="gvBorder" />                                                    </asp:TemplateField>                                                </Columns>                                                <RowStyle HorizontalAlign="Center" Height="30px" Width="30px" VerticalAlign="middle"                                                    Font-Underline="false" />                                                <HeaderStyle Height="0px" />                                            </asp:GridView>                                        </div>                                    </td>                                </tr>                            </table>                        </td>                        <td colspan="2" valign="top">                            <p>                                <asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server">                                </asp:ContentPlaceHolder>                            </p>                        </td>                    </tr>                </table>            </td>        </tr>    </table></asp:Content>

第一句代码<%@ Master Language="C#" AutoEventWireup="true" CodeFile="ChildPage.master.cs" Inherits="ChildPage" MasterPageFile="~/MasterPage.master" %>

就是对母版页MasterPage.master的继承（即嵌套到母版页MasterPage.master中）

该页中有一个GridView控件，ID为"gv_ChildMenu"

3、继承自子母版页ChildPage.master的内容页Content.aspx页面代码：

[c-sharp] view plaincopyprint?

<%@ Page Language="C#" MasterPageFile="~/ChildPage.master" AutoEventWireup="true" CodeFile="ContentPage.aspx.cs" Inherits="ContentPage" %>

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

4、内容页content.aspx初始化childPage.master的GridView控件

[c-sharp] view plaincopyprint?

ContentPlaceHolder cont = this.Master.Master.FindControl("ContentPlaceHolderMain") as ContentPlaceHolder;
GridView dl = cont.FindControl("gv_ChildMenu") as GridView;
List<ChildMenu> list = new List<ChildMenu>();
int i = 0;
while (i <= id)
{
ChildMenu menu = new ChildMenu();
menu.ChildMenuName = "菜单"+id+"的子菜单" + i;
list.Add(menu);
i++;
}
dl.DataSource = list;
dl.DataBind();

按正常思路：内容页调用母版页应该用这段代码即可

GridView dl = this.Master.FindControl("gv_ChildMenu") as GridView;

就可以得到ChildPage.master的GridView控件对象。

但是ChildPage.master本身是继承自母版页MasterPage.master，所以上述的代码无法得到GridView对象

页必须这样写：

ContentPlaceHolder cont = this.Master.Master.FindControl("ContentPlaceHolderMain") as ContentPlaceHolder;
GridView dl = cont.FindControl("gv_ChildMenu") as GridView;

先获取Masterpage.master的ContentPlaceHolder对象，然后再通过该对象寻找childPage.master的GridView控

件对象，然后进行初始化。

详细源码示例下载地址：http://download.csdn.net/source/2077818