Mike Hanson

NavFx Updated for SL 2.0 Release

Mike Hanson — Sun, 26 Oct 2008 08:28:00 GMT

NavFx has been updated to work with the release version of Silverlight 2.0 and new downloads for binaries and templates are available at http://www.codeplex.com/NavFx

NavFx Part 6 - Page Transition

Mike Hanson — Sat, 23 Aug 2008 11:35:27 GMT

The next article on NavFx is finally finished and can be read hear NavFx Part 6 - Page Transition

NavFx Part 5 - The Many Faces of GoToPage

Mike Hanson — Thu, 21 Aug 2008 17:37:21 GMT

The next article on NavFx is finally finished and can be read hear NavFx Part 5 - The Many Faces of GoToPage

NavFx Part 4 - Application Structure

Mike Hanson — Sun, 20 Jul 2008 11:28:24 GMT

The next article on NavFx is now available and can be read here NavFx Part 4 - Application Structure

NavFx Part 3 - At The Interface

Mike Hanson — Wed, 02 Jul 2008 20:54:00 GMT

The next article on NavFx is now available and can be read here NavFx Part 3 - At the Interface

NavFx Part 2 - Setting Up

Mike Hanson — Tue, 01 Jul 2008 08:01:04 GMT

The next article on NavFX is now available and can be read here NavFx Part 2 - Setting Up

Silverlight Cross Domain WCF calls with VS WebDev.WebServer.exe

Mike Hanson — Fri, 27 Jun 2008 07:03:24 GMT

This one had me stuck for hours earlier this week, and judging by the number of posts on forums plenty of other people are suffering the same, so I hope this little titbit saves someone the frustration I suffered.

I am using Visual Studio 2008 to create a Silverlight 2.0 (beta 2 at the moment) application. In my solution I have two web site projects, one for hosting the application, the other to host WCF services. All I want is to hit F5 and have both sites run in debug mode and my SL app call my WCF services and work. So I set my projects up as I believed they should be via the properties sheet for the project root as follows.

Disabled dynamic ports so I know the fixed address of the WCF
Remove the virtual directory name to make both root applications
Add the following clientaccesspolicy.xml file to the root of the WCF site (wide open for now)

<?xml version="1.0" encoding="utf-8"?>
<access-policy>
<cross-domain-access>
  <policy>
   <allow-from>
    <domain uri="*"/>
   </allow-from>
   <grant-to>
    <resource path="/"
        include-subpaths="true"/>
   </grant-to>
  </policy>
</cross-domain-access>
</access-policy>

So having written the code for my SL app to call my WCF service, references and all that stuff working fine I expect it all to work, I hit F5 in VS 2008 and both sites run, I can browse to the .svc file and get a working web page telling me how to create a client but in my SL application I get an error when I hit the button to call the service.

WTF? double check, tripple check, hours of googling to make sure I have done it right, that my clientaccesspolicy.xml file is right still not working. I read hundreds of blog/forum posts and articles and still no clue. Many talked about problems with WebDev.WebServer.exe not having a root to place the policy file in but I had that covered you can change it in the properties sheet for the project. Still no luck.

Just when I was about to give up and wire my project up to IIS I re-read an article that I had spotted earlier about "Self Hosting" WCF services in a Windows Service and what was required in the policy file to support this. Light bulb moment, WebDev.WebServer.exe may not be a Windows Service but it is effectively a "Self Hosting Process", a quick change to my clientaccesspolicy.xml file and bingo it works. What did I change? Look below at the attribute in bold on the <allow-from> element.

<?xml version="1.0" encoding="utf-8"?>
<access-policy>
<cross-domain-access>
  <policy>
   <allow-from http-request-headers="*">
    <domain uri="*"/>
   </allow-from>
   <grant-to>
    <resource path="/"
        include-subpaths="true"/>
   </grant-to>
  </policy>
</cross-domain-access>
</access-policy>

So make this note in your little black book:

When it comes to web services (WCF or ASMX) WebDev.WebServer.exe is a Self Hosting Process and any requirements for self hosting apply.

NavFx Part 1 - Quick Reference

Mike Hanson — Sat, 21 Jun 2008 16:46:14 GMT

I have posted my first article on the navigation framework NavFx I created for Silverlight. Took a little longer than expected as I actually had to get some work done. You can read it here NavFx Part 1 - Quick Reference.

1st July 2008 - This article has been updated with some recent changes and enhancements made to NavFx.

Silverlight Navigation Framework

Mike Hanson — Thu, 05 Jun 2008 07:18:41 GMT

I am working on a navigation framework for Silverlight 2.* applications and will be posting a series of articles and the code over the coming days and weeks.

The first article Introducing Silverlight Navigation Framework is available now.