WCF - Contract Name could not be found in the list of contracts

Question

I am relatively new to WCF. However, I need to create a service that exposes data to both Silverlight and AJAX client applications. In an attempt to accomplish this, I have created the following service to serve as a proof of concept:

[ServiceContract(Namespace="urn:MyCompany.MyProject.Services")]
public interface IJsonService
{
    [OperationContract]
    [WebInvoke(Method = "GET",
               RequestFormat=WebMessageFormat.Json,
               ResponseFormat = WebMessageFormat.Json)]
    List<String> JsonFindNames();
}

[ServiceContract(Namespace="urn:MyCompany.MyProject.Services")]
public interface IWsService
{
    [OperationContract(Name="FindNames")]
    List<String> WsFindNames();
}


[ServiceBehavior(Name="myService", Namespace="urn:MyCompany.MyProject.Services")]
public class myService : IJsonService, IWsService
{
    public List<String> JsonFindNames() 
        { return FindNames(); }
    public List<String> WsFindNames()
        { return FindNames(name); }
    public List<string> FindNames()
    { 
       List<string> names = List<string>(); 
       names.Add("Alan");
       names.Add("Bill");
       return results; 
    }        
}

When I try to access this service, I receive the following error:

The contract name 'myService' could not be found in the list of contracts implemented by the service 'myService'.

What is the cause of this? How do I fix this?

Thank you

Answer 1

Your contract is the Interface not the implementation.

Somewhere in the config you have written myService instead of IJsonService.

Answer 2

Remove the namespace from Service name. It will work fine.

Answer 3

Modify your web.config You can find <services> tag and below of this tag you have to have two other tag :

<service .... And <endpoint ....

In <endpoint> tag you have to reference to interface of your class.

For exampl : If your service class named CustomerSearch and your interface named ICustomerSearch you have to config like this :

  <service name="CustomerSearch" behaviorConfiguration="ServiceBehavior">
  <endpoint address="" binding="webHttpBinding" contract="ICustomerSearch" 
            behaviorConfiguration="ServiceAspNetAjaxBehavior">

Answer 4

I had the same issue, but my solution was that in my web.config, I was specifying the entire class name (including namespace), whereas WCF would only accept a class name.

This didn't work:

<services>
    <service name="BusinessServices.Web.RfsProcessor">

This worked:

<services>
    <service name="RfsProcessor">

Answer 5

I have had that error before for ServiceModel framework 3.5, and I checked my host's config file. I found it was my cut-and-paste error. My service was pointing to an old non-existing service than the one I am using. It starts working again after I corrected these lines like below:

<system.serviceModel>
<services>
  <!--<service name="NotUsed.Serv">-->
  <service name="InUse.MyService">
    <host>
      <baseAddresses>
        <!--<add baseAddress="http://localhost:8181/LastService" />-->
        <add baseAddress="http://localhost:8181/InUseService"/>
      </baseAddresses>
    </host>
  </service>
</services>
</system.serviceModel>

Note that MyService has to be the name of your contract class in ServiceModel 3.5 BUT IT IS IMyService contract interface in Framework 4.0 -->

namespace InUse {
[ServiceContract]
public interface IMyService 
{
    [WebGet(UriTemplate = "/GetList/{PATTERN}",
        RequestFormat = WebMessageFormat.Json,
        ResponseFormat = WebMessageFormat.Json)]
    [OperationContract]
    List<string> GetIDListByPattern(string PATTERN);

}

[ServiceBehavior(InstanceContextMode = InstanceContextMode.Single)]    
public class MyService : IMyService
{        
    List<string> MySample = (new _PointRT()).Sample().Select(r=>r._pointXID).ToList();

    public List<string> GetIDListByPattern(string PATTERN) {
        return MySample.Where(x => x.Contains(PATTERN)).ToList();
    }
}