ASP.NET Multiple Page_Load events with URL Rewriting - asp.net

Question

Im using intelligencia urlrewriter as my url rewrite module. I have one very strange problem which only occurs when an url is rewritten but to make it more fun, not on all rewritten pages.
Edit: Forgot to tell you what's the problem boing boing. the problem is that my Page_Load event gets fired 2 times.
This is how my form rewrite adapter looks like:
using System;
using System.Web.UI;
using System.Web;
using System.Web.UI.WebControls;
public class FormRewriterControlAdapter : System.Web.UI.Adapters.ControlAdapter
{
protected override void Render(System.Web.UI.HtmlTextWriter writer)
{
base.Render(new RewriteFormHtmlTextWriter(writer));
}
}
public class RewriteFormHtmlTextWriter : HtmlTextWriter
{
public RewriteFormHtmlTextWriter(HtmlTextWriter writer)
: base(writer)
{
this.InnerWriter = writer.InnerWriter;
}
public RewriteFormHtmlTextWriter(System.IO.TextWriter writer)
: base(writer)
{
base.InnerWriter = writer;
}
public override void WriteAttribute(string name, string value, bool fEncode)
{
// If the attribute we are writing is the "action" attribute, and we are not on a sub-control,
// then replace the value to write with the raw URL of the request - which ensures that we'll
// preserve the PathInfo value on postback scenarios
if ((name == "action"))
{
HttpContext Context = default(HttpContext);
Context = HttpContext.Current;
if (Context.Items["ActionAlreadyWritten"] == null)
{
// Because we are using the UrlRewriting.net HttpModule, we will use the
// Request.RawUrl property within ASP.NET to retrieve the origional URL
// before it was re-written. You'll want to change the line of code below
// if you use a different URL rewriting implementation.
value = Context.Request.RawUrl;
// Indicate that we've already rewritten the <form>'s action attribute to prevent
// us from rewriting a sub-control under the <form> control
Context.Items["ActionAlreadyWritten"] = true;
}
}
base.WriteAttribute(name, value, fEncode);
}
}
And this is how my web.config looks like
<!-- Here the double page_load occurs -->
<rewrite url="~/car-parts/(\d+)/(.+)" to="~/Products.aspx?type=parts&iid=$1&cid=9" />
<rewrite url="~/car-stereo/(\d+)/(.+)" to="~/Products.aspx?type=stereo&iid=$1&cid=10" />
<!-- this is working correctly -->
<rewrite url="~/car-parts/browse-by-type/(\d+)/(.+)/(\d+)/(\d+)" to="~/Browse.aspx?cid=9&type=country&countryid=$1&p=$3&filter=$4" />
I have no idea where to look anymore, i checked my html markup since i've read that could couse this problem.
Kind regards,
Mark

Answer 1

when I'm using this rewrite rule in my rules,this problem has been solved:
<rewrite url="^(/.+(\.gif|\.flv|\.swf|\.png|\.jpg|\.ico|\.pdf|\.doc|\.xls|\.css|\.zip|\.rar|\.js|\.xml|\.mp3)(\?.+)?)$" to="$1" processing="stop" />
but remember to use this rule after all of your .css/.js/.jpg/... rules.

Answer 2

Finally I found it, it was not having anything to do with the rewrite module , this is which caused the problem:
In one of my usercontrols i've used updateprogress
<asp:UpdateProgress runat="server" AssociatedUpdatePanelID="upNewsletter" DisplayAfter="0">
<ProgressTemplate>
<asp:Image runat="server" ID="imgLoading" ImageUrl="~/Images/Template/loading.gif" />
</ProgressTemplate>
</asp:UpdateProgress>
Now thats where the problem is , in the asp:Image tag. I've replaced it with a regular img tag and now everything works fine again. Took me some time to figure this out and I hope I can save you headache.
Kind regards

Answer 3

I've found this post searching for multiple page_loads, but I had the problem using a dynamically created CollapsePanel using a dynamically created Image. By filling the ImageUrl to a default image, the problem was solved.
header.Controls.Add( new Image
{
ID = string.Format( "headerImage_{0}", panelId ),
EnableViewState = false,
ImageUrl = "~/Images/collapse.jpg"
} );