Monthly Archives: October 2010

Reserved XAP file names (‘..Resource.dll’)

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My Silverlight app was referencing an external assembly, called Library.Resources.dll, which contained some images. When I set my UriSource to UriSource="/Library.Common;Component/Images/view.png" my image appeared at design time without any problem. However, when I ran the application the image would not appear.

After inspecting the contents of my XAP file I noticed that the resource assembly was missing. Apparently, assembly’s ending in Resource.dll are not allowed in the XAP which was why mine was missing. I changed the name of the assembly to Library.Common, as well as my UriSource then the assembly was included in the XAP file and and my images successfully appeared.

The remote server returned an error: NotFound

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Always start with the obvious…if you are using Silverlight make sure you have a basicHttpBinding endpoint specified for the WCF service. Otherwise, the request will not even make it to the server because the relevant endpoint is ‘NotFound‘.

VS 2010 – Discovering web services in your solution

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In order to use the “Discover services in solution” functionality, the service projects must be based on one of the WCF project templates.

If you want to alter your existing project(s) so that they will be identified as projects containing WCF service(s), do the following:

* Right-click on the project in the Solution Explorer, and select Unload project
* Right-click the project again (this time the node will end in (unavailable) ) and choose Edit xxxxx.csproj
* In the first section, add the following line:
{3D9AD99F-2412-4246-B90B-4EAA41C64699};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}
* Save and close the file
* Reload the project by right-clicking it again and choose Reload.

You should then be able to use the “Discover services in solution” functionality.

Feature activation error

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The element of type ‘Module’ for feature ‘<feature name>‘ (id: 03fffd3f-5b80-4507-87ed-ab8797883b04) threw an exception during activation: Cannot complete this action.  Please try again.

Whilst trying to activate a new feature I had deployed to SharePoint I got this error (above). My feature worked fine during development but the activation just kept throwing an error. The error wasn’t very helpful either and the stack trace in the Unified Logging Service didn’t really give me any more clues.

My Elements.xml file had two Modules specified. One for a web page and one for the web parts that were going to sit on the web page. I tinkered with the Elements.xml file and commented out the page module to see if that was the problem. Low and behold when I tried the activation this time the process completed successfully. Somewhere in the web page module there was a conflict!

<Module Name="WebPages" Path="" Url="" RootWebOnly="True">
 <File Url="MyPage.aspx" Type="Ghostable" IgnoreIfAlreadyExists="True">
 <Property Name="Title" Value="MyPage" />
 <NavBarPage Name="MyPage" ID="1003" Position="End" />
 </File>
 </Module>

It turns out that the problem was the ID attribute value for the NavBarPage element. This feature was being inserted into a site with an existing entry in the navigation area called ‘MyPage’ with an ID of 1002. The solution was to got to the Top Link Bar option under the Site Settings and remove the unnecessary link.

Having done that and changed the ID value to match the existing value I was able to successfully activate the feature.