Question

Add controls to a Master Page's contentpage

Asked by: gjok

Hi.
Is it possible to add a control to a Master Page's contentpage ( NOT the contentPlaceHolder in the MasterPage)
I need to add it from the contentpage's codebehind, not the MasterPage's codebehind
Like this:
Masterpage:
<asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server" />

Home.aspx:
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">

Home.aspx.cs:
      Label lbl1 = new Label();
      lbl1.Text="Hello world!";
      this.Content1.Controls.Add(lbl1);
-----------------------------------
I dont want to use Findcontrol as I hear this is not a very good practice.
Thanks



                                  
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Asked On
2007-12-09 at 08:03:18ID23011610
Tags

page

,

master

,

masterpage

,

controls

Topics

Programming for ASP.NET

,

C# Programming Language

Participating Experts
1
Points
100
Comments
7

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Answers

 

by: McExpPosted on 2007-12-09 at 14:43:06ID: 20438466

If used correctly there is nothing wrong with FindControl, in many cases when doing dynamic control creation it's the only solution.

I'm not quite sure what you need to do.

If you want to be able to overide sections of the Master page then you add a ContentPlaceholder and modify the contents of that from your content page. what was your example trying to show?

 

by: McExpPosted on 2007-12-09 at 15:00:17ID: 20438517

If you want you can expose an asp:placeholder as a property from your master page code behind, see my example below:-

--- Master Page File (Site1.master) ---
<%@ Master Language="C#" AutoEventWireup="true" CodeBehind="Site1.master.cs" Inherits="Testing.Site1" %>
 
<!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>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:PlaceHolder ID="phInMasterPage" runat="server"></asp:PlaceHolder>
        <asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server">
        </asp:ContentPlaceHolder>
    </div>
    </form>
</body>
</html>
 
--- Master Page Code Behind File (Site1.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;
 
namespace Testing
{
    public partial class Site1 : System.Web.UI.MasterPage
    {
 
        public PlaceHolder MasterPagePlaceHolder
        {
            get { return phInMasterPage; }
            set { phInMasterPage = value; }
        }
 
        protected void Page_Load(object sender, EventArgs e)
        {
 
        }
    }
}

                                              
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by: McExpPosted on 2007-12-09 at 15:03:29ID: 20438527

In order to access the above from a content page you will need to define the "MasterType" for the page. See example below for a usage.

--- Web Form File (WebForm1.aspx) ---
<%@ Page Language="C#" AutoEventWireup="true" MasterPageFile="~/Site1.Master" CodeBehind="WebForm1.aspx.cs" Inherits="Testing.WebForm1" %>
<%@ MasterType VirtualPath="~/Site1.Master" %>
<asp:Content ContentPlaceHolderID="ContentPlaceHolder1" runat="server" ID="test1">
</asp:Content>
 
--- Web Form Code Behind File (WebForm1.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;
 
namespace Testing
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            Label tmpLabel = new Label();
            tmpLabel.Text = "Hello Dynamic World";
            phControlsHere.Controls.Add(tmpLabel);
            Master.MasterPagePlaceHolder.Controls.Add(tmpLabel);
        }
    }
}

                                              
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by: gjokPosted on 2007-12-11 at 02:25:15ID: 20448304

Thanks, but I dont want to add PlaceHolder propertiies to my masterpage - I already have a contentplaceholder
I just want to know why the following code doesnt work:

Home.aspx:
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">

Home.aspx.cs:
      Label lbl1 = new Label();
      lbl1.Text="Hello world!";
      this.Content1.Controls.Add(lbl1);

 

by: gjokPosted on 2007-12-11 at 02:31:00ID: 20448324

Refering to your last example, I want to do this:
Your ContentPlaceHolderID has an ID="test1".

namespace Testing
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            Label tmpLabel = new Label();
            tmpLabel.Text = "Hello Dynamic World";
            test1.Controls.Add(tmpLabel);
            // Master.MasterPagePlaceHolder.Controls.Add(tmpLabel);
        }
    }
}
                                              
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by: McExpPosted on 2007-12-12 at 14:34:13ID: 20460799

This doesn't work because you can't get a reference to the content placeholder as a control (without using findcontrol, which your looking to avoid?).

 

by: gjokPosted on 2007-12-17 at 02:22:00ID: 31413750

Thanks

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