如何以编程方式将控件添加到母版页的内容占位符 [英] how to add controls to the masterpage's content placeholder programmatically
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问题描述
在base.master上:
On the base.master:
<%@ Master Language="C#" AutoEventWireup="true" CodeBehind="Base.master.cs" Inherits="WebApplicationControlTest.Base" %>
<!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>The title</title>
<asp:ContentPlaceHolder ID="head" runat="server">
</asp:ContentPlaceHolder>
</head>
<body>
<form id="form1" runat="server">
<div>
There is a content here: <br />
<asp:ContentPlaceHolder ID="body" runat="server">
</asp:ContentPlaceHolder>
</div>
</form>
</body>
</html>
在嵌套母版上
<%@ Master Language="C#" MasterPageFile="~/MasterPages/Base.Master" AutoEventWireup="true" CodeBehind="NestedMasterPageTest2.master.cs" Inherits="WebApplicationControlTest.MasterPages.NestedMasterPageTest2" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server">
</asp:Content>
<asp:Content ID="PlaceHolder" ContentPlaceHolderID="body" runat="server">
This is inside the NestedPage<br />
<asp:ContentPlaceHolder ID="PlaceHolderLeft" runat="server">
</asp:ContentPlaceHolder>
<asp:ContentPlaceHolder ID="PlaceHolderRight" runat="server">
</asp:ContentPlaceHolder>
</asp:Content>
以及default.aspx
and on the default.aspx
<asp:Content ID="PlaceHolder" ContentPlaceHolderID="PlaceHolderLeft" runat="server">
This is a test!
</asp:Content>
在default.aspx.cs上
on the default.aspx.cs
protected override void OnPreInit(EventArgs e){
Control control = LoadControl("TheUrlOfTheControl.ascx");
if (Page.Master.FindControl("body") != null) {
Page.Master.FindControl("body").Controls.Add(control);
}
}
我需要将控件添加到正文内容占位符的最后一部分，但FindControl确实返回null ...我们如何以编程方式将控件添加到母版页的内容占位符?
I need to add the control to the last part of the body content Placeholder but FindControl does return null... how can we add controls to the masterpage's content placeholder programmatically?
谢谢
推荐答案
为将来的使用提供了参考
Answered for future reference
protected override void OnPreInit(EventArgs e){
Control control = LoadControl("TheUrlOfTheControl.ascx");
Control placeHolderControl = Page.FindControl("body");
if (placeHolderControl != null) {
placeHolderControl.Controls.Add(control);
} else {
MasterPage theMaster = Page.Master;
while (theMaster != null) {
placeHolderControl = theMaster.FindControl("body");
if (placeHolderControl != null) {
placeHolderControl.Controls.Add(control);
break;
}
theMaster = theMaster.Master;
}
}
}
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