Hosting an wcf service into a website issue : System.ArgumentException: ServiceHost only supports class service types

Question

I have something like this:

MathServiceLibrary (WCF Service Library)

[ServiceContract]
public interface IMathService
{
        [OperationContract]
        int Add(int x, int y);
        [OperationContract]
        int Multiply(int x, int y);
}

public class MathService : IMathService
{
        public int Add(int x, int y)
        {
            return x + y;
        } 

        public int Multiply(int x, int y)
        {
            return x * y;
        }
}

<behaviors>
   <serviceBehaviors>
      <behavior name="defaultServiceBehavior">
         <serviceMetadata httpGetEnabled="true" />
      </behavior>
   </serviceBehaviors>
</behaviors>
<services>
   <service behaviorConfiguration="defaultServiceBehavior" 
            name="MathServiceLibrary.MathService">
       <endpoint 
           address="mex" 
           binding="mexHttpBinding" 
           contract="IMetadataExchange" />
       <endpoint 
           address="math" 
           binding="wsHttpBinding" 
           contract="MathServiceLibrary.IMathService" />
       <host>
          <baseAddresses>
             <add baseAddress="http://localhost:8080/" />
          </baseAddresses>
       </host>
    </service>
 </services>

If I run this I can see the WCF Test Client and everything is ok.

Now I want to host this service into IIS so I create a web site and add a reference to MathServiceLibrary.

I have this ms.svc

<%@ ServiceHost Language="C#" Debug="true" 
    Service="MathServiceLibrary.IMathService" %> 

and this web.config

    <system.serviceModel>
        <services>
            <service behaviorConfiguration="defaultServiceBehavior" name="MathServiceLibrary.MathService">
                <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/>
                <endpoint address="" binding="wsHttpBinding" contract="MathServiceLibrary.IMathService">
                    <identity>
                        <dns value="localhost"/>
                    </identity>
                </endpoint>
            </service>
        </services>
        <behaviors>
            <serviceBehaviors>
                <behavior name="defaultServiceBehavior">
                    <serviceMetadata httpGetEnabled="true"/>
                    <serviceDebug includeExceptionDetailInFaults="false"/>
                </behavior>
            </serviceBehaviors>
        </behaviors>
        <serviceHostingEnvironment multipleSiteBindingsEnabled="true" />
    </system.serviceModel>

When I right click on ms.svc view in browser I get this:

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.ArgumentException: ServiceHost only supports class service types.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[ArgumentException: ServiceHost only supports class service types.]
System.ServiceModel.Description.ServiceDescription.GetService(Type serviceType) +12229075
System.ServiceModel.ServiceHost.CreateDescription(IDictionary`2& implementedContracts) +55
System.ServiceModel.ServiceHostBase.InitializeDescription(UriSchemeKeyedCollection baseAddresses) +154
System.ServiceModel.ServiceHost.InitializeDescription(Type serviceType, UriSchemeKeyedCollection baseAddresses) +49
System.ServiceModel.ServiceHost..ctor(Type serviceType, Uri[] baseAddresses) +151
System.ServiceModel.Activation.ServiceHostFactory.CreateServiceHost(Type serviceType, Uri[] baseAddresses) +30
System.ServiceModel.Activation.ServiceHostFactory.CreateServiceHost(String constructorString, Uri[] baseAddresses) +420
System.ServiceModel.HostingManager.CreateService(String normalizedVirtualPath) +1440
System.ServiceModel.HostingManager.ActivateService(String normalizedVirtualPath) +44
System.ServiceModel.HostingManager.EnsureServiceAvailable(String normalizedVirtualPath) +615

[ServiceActivationException: The service '/MathWebSite/ms.svc' cannot be activated due to an exception during compilation. The exception message is: ServiceHost only supports class service types..]
System.Runtime.AsyncResult.End(IAsyncResult result) +679246
System.ServiceModel.Activation.HostedHttpRequestAsyncResult.End(IAsyncResult result) +190
System.ServiceModel.Activation.HostedHttpRequestAsyncResult.ExecuteSynchronous(HttpApplication context, String routeServiceVirtualPath, Boolean flowContext, Boolean ensureWFService) +234
System.ServiceModel.Activation.HttpModule.ProcessRequest(Object sender, EventArgs e) +355
System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +148
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +75

I can't figure out what I am missing.

Answer 1

Change your ms.svc as below

<%@ ServiceHost Language="C#" Debug="true" Service="MathServiceLibrary.MathService" %    > 

You have to give the class name instead of interface name

Answer 2

Your .svc file is wrong. It references the interface, not the implementation. Change it to this: <%@ ServiceHost Language="C#" Debug="true" Service="MathServiceLibrary.MathService" %>