Atlanta .NET Regular Guys

Error Type Not loading when building custom web services in SharePoint 2007

If you have followed the steps in the MSDN article http://msdn2.microsoft.com/en-us/library/ms464040.aspx or used the blog post http://blogs.ittoolbox.com/km/sharepoint/archives/creating-a-custom-web-service-for-sharepoint-13553 you may have run into an error that looked like the follow:

Could not load type 'DevCow.SharePoint.WebServices.HelloBrendon' from assembly 'DevCow.SharePoint.WebServices, Version=1.0.0.0, Culture=neutral, PublicKeyToken=bf7fa58d7195484e'

You might find it strange that nothing is in the eventlog or the SharePoint log, so for a new person or even skilled person this would give them no idea of what to change.

There could be a couple of reasons.

1. The class might not be in the assembly.  To fix this just add the right reference to the class.
2. I couldn't find the real problem, sorry there is no magic fix yet.

Here is what I did to fix number 2

1. I added this the AssemblyInfo.cs file
   
   using System.Security;
   
   [assembly: AllowPartiallyTrustedCallers()]
   
2. Rebuilt the Class file.
3. Ran IISReset.
4. Redeployed my files to the server.
5. Navigated to the file http://sharepoint.devcow.com/_layouts/DevCowSampleWebService.asmx
6. Removed the added code from AssemblyInfo.cs
7. Rebuilt the Class file
8. Ran IISReset.
9. Redeployed my files to the server
10. Navigated to the file http://sharepoint.devcow.com/_layouts/DevCowSampleWebService.asmx and it still worked.

I am sorry that I don't have more helpful information for this problem, I know it can be frustrating if you do have the error.

Now I am having trouble recreating the problem, but I know I saw it.  If you are having trouble please email me to try to figure this problem out.