Comments on: How to get URL rewriting to work with ASP.Net 2.0 Themes and form post-backs http://jlcoady.net/aspnet/how-to-url-rewrite-asp-net-2-theme-form-postback Wed, 13 Oct 2010 08:27:13 +0000 hourly 1 http://wordpress.org/?v=3.0.1 By: Dick Nagtegaal http://jlcoady.net/aspnet/how-to-url-rewrite-asp-net-2-theme-form-postback/comment-page-1#comment-291 Dick Nagtegaal Wed, 15 Jul 2009 11:31:03 +0000 http://blog.jlcoady.net/?p=10#comment-291 I don't know if I didn't pay attention or if something changed (I've cleared my browser cache and restarted IIS), but now your code doesn't seem to work at all. I have: RewriteRule ^IdList/(\d*)/(\d*)\.html$ /Default.aspx?Id=$1&SubId=$2 When I request http://www.example.com/IdList/1/2.html I am indeed redirected to Default.aspx?Id=1&SubId=2. With just the rewrite rule and without your code, the action attribute of the form tag contains "Default.aspx?Id=1&SubId=2". After adding your code it contains: "2.html?Id=1&SubId=2". Although this does work, clicking a button on the form changes the url in the address bar to "http://www.example.com/IdList/1/2.html?Id=1&SubId=2". The Control Adapter solution presented by Scott does not do that. I don’t know if I didn’t pay attention or if something changed (I’ve cleared my browser cache and restarted IIS), but now your code doesn’t seem to work at all. I have:
RewriteRule ^IdList/(\d*)/(\d*)\.html$ /Default.aspx?Id=$1&SubId=$2

When I request http://www.example.com/IdList/1/2.html I am indeed redirected to Default.aspx?Id=1&SubId=2.
With just the rewrite rule and without your code, the action attribute of the form tag contains “Default.aspx?Id=1&SubId=2″. After adding your code it contains: “2.html?Id=1&SubId=2″.

Although this does work, clicking a button on the form changes the url in the address bar to “http://www.example.com/IdList/1/2.html?Id=1&SubId=2″. The Control Adapter solution presented by Scott does not do that.

]]> By: Dick Nagtegaal http://jlcoady.net/aspnet/how-to-url-rewrite-asp-net-2-theme-form-postback/comment-page-1#comment-290 Dick Nagtegaal Wed, 15 Jul 2009 09:05:57 +0000 http://blog.jlcoady.net/?p=10#comment-290 This code indeed is much simpler than using the Control Adapter approach. I have one problem with it however. When requesting the root of the application (i.e. www.example.com/) the value of HTTP_X_REWRITE_URL is '/'. For some reason this results in an "Object reference not set to an instance of an object" error. The stack trace shows no source file, but it starts with: [NullReferenceException: Object reference not set to an instance of an object.] System.Web.UI.Control.ResolveClientUrl(String relativeUrl) +124 I've tried adding a rewrite rule to explicitely rewrite / to /Default.aspx (Rewrite ^$ /Default.aspx) but that doesn't make a difference. Off course I can just check the originalUrl for being equal to "/" to prevent the problem. Can you confirm this behaviour? Any idea why it is happening? If you see the same behaviour, maybe you could adapt your code so it doesn't occur. This code indeed is much simpler than using the Control Adapter approach. I have one problem with it however. When requesting the root of the application (i.e. http://www.example.com/) the value of HTTP_X_REWRITE_URL is ‘/’. For some reason this results in an “Object reference not set to an instance of an object” error.

The stack trace shows no source file, but it starts with:
[NullReferenceException: Object reference not set to an instance of an object.]
System.Web.UI.Control.ResolveClientUrl(String relativeUrl) +124

I’ve tried adding a rewrite rule to explicitely rewrite / to /Default.aspx (Rewrite ^$ /Default.aspx) but that doesn’t make a difference. Off course I can just check the originalUrl for being equal to “/” to prevent the problem.

Can you confirm this behaviour? Any idea why it is happening?
If you see the same behaviour, maybe you could adapt your code so it doesn’t occur.

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