NinjectHttpModule Causing Loss of Data in DataBound Controls

[Nathan]

This problem has been baffling me for some time now and I just tracked
the cause down to Ninject, but I cannot imagine why it's happening...

If I set a DataSource for a databound control like a ListView or a
Repeater in a Page_Load event then initiate a PostBack, the Repeater/
ListView is returned with no items in it, but if I bind a label's Text
property to some value, call DataBind() and then initiate a PostBack
the text value is not lost.

This problem seems to directly to pertain to whether or not I have
added the NinjectHttpModule to my web.config because if I remove the
<add /> declaration Repeaters and ListViews again function exactly how
they are supposed to.

Has anyone seen this happen? I have confirmed the problem in two
separate ASP.NET projects.

This is an ASP.NET 4 project demonstrating the problem:
http://www.lakario.com/files/NinjectHttpModuleBug.zip

Should I just use PageBase instead of an HttpModule?

[Charles Vallance]

I don't know why Ninject.Web doesn't have a UserControlBase... but here's one I created and use:

namespace Ninject.Web

{

    /// <summary>

    /// A <see cref="UserControl"/> that supports injections.

    /// </summary>

    public abstract class UserControlBase : UserControl

    {

        /// <summary>

        /// Raises the <see cref="E:System.Web.UI.Control.Init"></see> event to initialize the user control.

        /// </summary>

        /// <param name="e">An <see cref="T:System.EventArgs"></see> that contains the event data.</param>

        protected override void OnInit( EventArgs e )

        {

            base.OnInit( e );

            RequestActivation();

        }

        /// <summary>

        /// Asks the kernel to inject this instance.

        /// </summary>

        protected virtual void RequestActivation()

        {

            KernelContainer.Inject( this );

        }

    }

}

On Thu, Sep 2, 2010 at 4:41 PM, Nathan <lak...@gmail.com> wrote:

Clarification: removing the HttpModule from the Web.config caused
UserControls to no longer be injected, but pages that inherit from
PageBase are being injected correctly.

On Sep 2, 5:32 pm, Nathan <laka...@gmail.com> wrote:
> Well I tried disabling the HttpModule and updating all of my pages to
> inherit from PageBase, but it does not appear as though any of my
> values are being activated with this change.

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[Nathan]

This seems to have solved the problem for me.

What is it about the code in the NinjectHttpModule that could be
causing the experience I was having? I copied the code from
NinjectHttpModule into PageBase's OnInitComplete event handler and
again received the strange behavior from Repeaters/ListViews as I did
when using the module. This is the code that appears to cause
everything to fail:

/// <summary>
/// Search for usercontrols within the parent control
/// and inject their dependencies using KernelContainer.
/// </summary>
/// <param name="parent">The parent control.</param>
private static void InjectUserControls( Control parent )
{
if ( parent == null || parent.Controls == null )
{
return;
}

foreach ( Control control in parent.Controls )
{
if ( control is UserControl )
{
KernelContainer.Inject( control );
}

InjectUserControls( control );
}
}

On Sep 2, 5:45 pm, Charles Vallance <vallance.char...@gmail.com>
wrote:

> > ninject+u...@googlegroups.com<ninject%2Bunsu...@googlegroups.com>
> > .