Re: Template data is not being replaced in a Templated ASP.NET server control...

Adam Sills <[email protected]> Thu, 29 Mar 2007 16:01:41 -0500
Newsgroups	gmane.comp.windows.devel.dotnet.web
Message-ID	<[email protected]>
You have two problems.

1. You're not calling DataBind on your scanner control
2. WebControl by itself does not loop through its child controls and call
DataBind on them in its DataBind call. You need to do that yourself or
inherit from CompositeControl instead.

Adam..

-----Original Message-----
From: Discussion of building .NET applications targeted for the Web
[mailto:[email protected]] On Behalf Of Mike Andrews
Sent: Thursday, March 29, 2007 3:47 PM
To: [email protected]
Subject: [DOTNET-WEB] Template data is not being replaced in a Templated
ASP.NET server control...

Guys,

I'm really lost now.  I cannot, I repeat cannot, get the data in my
container control that represents the template to work.
If you notice in my markup, I have this: <%# Container.Text %>.  When the
template control is created (MyContainer) and I call the Instantiate, this
value is not replaced with the message "The default container text!" as it
should have been, but instead is replaced with nothing.

Any help would be most appreciated.  I'm really at my wits end with this
one.

Thanks,
Mike

Here's my asp.net markup:

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs"
Inherits="_Default" %>
<%@ Register Assembly="Scanner" Namespace="Scanner" TagPrefix="cc1" %>
<!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>
        <cc1:ScannerControl id="ScannerControl1_1" runat="server">
            <Template>
                <h1><%# Container.Text %></h1>
            </Template>
        </cc1:ScannerControl>
</div>
    </form>
</body>
</html>


Here's the result of the page when it's run:

<!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><title>
 Untitled Page
</title></head>
<body>
    <form name="form1" method="post" action="Default.aspx" id="form1">
<div>
<input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE"
value="/wEPDwUJNTgwMjcwMjU1ZGTpLl3HHZKhrXybhi5mD/cUEBCBwQ==" />
</div>
    <div>
        <span id="ScannerControl1_1">
                <h1></h1>
            </span>
</div>
    </form>
</body>
</html>


Here is a really scaled down version of my code:


    [ToolboxData("<{0}:ScannerControl runat=server></{0}:ScannerControl>")]
    public class ScannerControl : WebControl {
        private ITemplate _template;
        [TemplateContainer(typeof(MyContainer))]
        [PersistenceMode(PersistenceMode.InnerProperty)]
        public ITemplate Template {
            get { return _template; }
            set { _template = value; }
        }

        protected override void CreateChildControls() {
            this.Controls.Clear();
            if (this.Template != null) {
                MyContainer mc = new MyContainer("The default container
text!");
                this.Template.InstantiateIn(mc);
                this.Controls.Add(mc);
            }
            base.CreateChildControls();
        }
    }

    public class MyContainer : Control, INamingContainer {
        public MyContainer(string text) {
            this.Text = text;
        }

        private string _text;
        public string Text {
            get { return _text; }
            set { _text = value; }
        }
    }

===================================
This list is hosted by DevelopMentorR  http://www.develop.com

View archives and manage your subscription(s) at http://discuss.develop.com

===================================
This list is hosted by DevelopMentor®  http://www.develop.com

View archives and manage your subscription(s) at http://discuss.develop.com