The type <service>, provided as the Service attribute value in the ServiceHost directive could not be found.

February 26, 2008

I recently had a tough time to resolve this issue.

The problem: The WCF service stopped working without any “breaking” changes done

The exception: The type <xxxxx> provided as the Service attribute value in the ServiceHost directive could not be found. (Complete stack-trace below).

The solution: The class name (aka. type) was missing the complete signature. As my project assembly is strong named and GACed, the declaration should be “type, assembly, version, culturePublicKeyToken”).

 Earlier declaration: <% @ServiceHost Language=C# Debug=”true” Service=”typeXXXXX” %>

The corrected declaration: <% @ServiceHost Language=C# Debug=”true” Service=”typeXXXX, assembly,version=1.0.0.0, culturePublicKeyToken=xxxx” %>

Posted by Denny
Filed in .Net, .Net 3.0, WCF
17 Comments »

17 Responses to “The type <service>, provided as the Service attribute value in the ServiceHost directive could not be found.”

  1. mass Says:

    October 14, 2008 at 8:48 am

    could u please write the below declaration with some example?

    Reply
  3. mass Says:

    October 14, 2008 at 8:49 am

    typeXXXX, assembly,version=1.0.0.0, culturePublicKeyToken=xxxx

    Reply
  4. Stefano Ricciardi Says:

    June 23, 2009 at 2:38 am

    Thank you, this helped me with when I tried to move all the assemblies to the GAC only for deployment.

    Reply
  5. Ravi Says:

    August 10, 2009 at 11:01 am

    Build the solution first, and then a add a service reference.

    Reply
  6. SBlangkon Says:

    August 13, 2009 at 8:49 pm

    Try to check your spelling in svc. Because it must use case sensitive letter.

    Reply
  7. G-Man Says:

    August 19, 2009 at 8:53 am

    Thanks Ravi,
    The rebuild trick worked.

    Reply
  8. John Oschwald Says:

    November 18, 2009 at 11:53 am

    Thanks! The documentation I read said the assembly could be in the GAC but it would have been helpful if they had mentioned the @ServiceHost requirements in order to make that work! I appreciate you taking the time to share this.

    Reply
  10. halone Says:

    April 28, 2010 at 8:22 am

    I had same problem, I tried different ways,none of them worked, but my problem or solution was about have wrong namespace in the code, like:

    namespace MyCompany.MyProject
    {
    public class HHTInterface : IHHTInterface
    {
    }
    }

    by removing the namespace problem solved.

    Reply
  11. Franklin Says:

    July 22, 2010 at 1:22 am

    Thanks, This helped me resolve my problem.

    Reply
  12. deepikamehta Says:

    October 13, 2011 at 8:02 am

    Following is the error that i am getting in someone’s code which i have to modify.I dont have any experience regarding WCF but have initial knowledge

    Error:The type ‘Springwell.RestServices.DataService’, provided as the Service attribute value in the ServiceHost directive, or provided in the configuration element system.serviceModel/serviceHostingEnvironment/serviceActivations could not be found.

    Below is the structur of my Webconfig file:

    Reply
  14. tarun Says:

    March 23, 2012 at 12:57 pm

    change the build output path to “bin\” if not set and then run

    Reply
  15. Rob Church Says:

    December 28, 2012 at 10:03 am

    For anyone else wondering, this directive can be found in the .svc file itself, you need to edit it using “Open With…”

    Reply
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