Fixing Form Action on UrlRewrite
08/01/2010 Leave a comment
IF you’re rewriting URL’s, you’ve probably come across the same problem I had.
When posting back on the page, the real URL is used.. this is a real pain if you’re writing a page which uses the RawUrl to serve up relevant content.
I had a good look around the web for a solution. These ranged from creating a custom HtmlForm control to replacing the form tag in the App_Browsers folder.
The following is simple and worked for me.
Place the following code in the Page_Load of the page you’re serving up.
HttpContext.Current.RewritePath(HttpContext.Current.Request.RawUrl);
Orginal : http://www.geekzilla.co.uk/View0472D2E7-4653-46B1-AC36-5EA246B17D22.htm
Another and good way to do this using adding a browserfile to App_Browser and write an adapter.
If you do this you dont need to add any code in your pages Page_Load’s
Browser file content:
<browsers>
<browser refID="Default">
<controlAdapters>
<adapter controlType="System.Web.UI.HtmlControls.HtmlForm"
adapterType="FormRewriterControlAdapter" />
</controlAdapters>
</browser>
</browsers>
Rewriter.cs code:
using System;
using System.Data;
using System.Configuration;
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;
/// <summary>
/// Summary description for FormRewriter
/// </summary>
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;
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);
}
}
Based on : http://aspalliance.com/1234_TipTrick_Url_Rewriting_with_ASPNET.all#Page4
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