RIA Service Error in a Silverlight Application

Question

In a very simple Silverlight Application I have a DomainService Class which has a single method that returns a list of Letter Objects.

The application works fine when I run it in VisualStudio. However, when I publish it to a folder on my Windows 10 local machine and run it using IIS (version 10.0.166299.5) I get the following error:

The remote server returned an error: NotFound. at System.ServiceModel.DomainServices.Client.OperationBase.Complete(Exception error) at System.ServiceModel.DomainServices.Client.LoadOperation.Complete(Exception error) at System.ServiceModel.DomainServices.Client.DomainContext.CompleteLoad(IAsyncResult asyncResult) at System.ServiceModel.DomainServices.Client.DomainContext.<>c__DisplayClass1b.b__17(Object )

I supect this is due to something being wrong in missing in my WebConfig file. My WebConfig Currently looks like this:

<?xml version="1.0"?>

<!--
  For more information on how to configure your ASP.NET application, please visit
  http://go.microsoft.com/fwlink/?LinkId=169433
  -->

<configuration>

    <system.web>
      <compilation debug="true" targetFramework="4.6" />
      <httpRuntime targetFramework="4.6" />
    </system.web>




  <system.webServer>
    <validation validateIntegratedModeConfiguration="false" />
    <modules runAllManagedModulesForAllRequests="true">
      <add name="DomainServiceModule" preCondition="managedHandler" type="System.ServiceModel.DomainServices.Hosting.DomainServiceHttpModule, System.ServiceModel.DomainServices.Hosting, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
    </modules>
  </system.webServer>


  <system.serviceModel>
    <serviceHostingEnvironment aspNetCompatibilityEnabled="true" multipleSiteBindingsEnabled="true" />
  </system.serviceModel>


</configuration>

The code for my Domain Service Class is like this:

using System.Collections.Generic;
using System.Linq;
using System.ServiceModel.DomainServices.Hosting;
using System.ServiceModel.DomainServices.Server;
using SilverData.Web.Models;

namespace SilverData.Web.Services
{
    [EnableClientAccess]
    public class DrugsRiaService : DomainService
    {


        public IQueryable<Letter> GetAllLetters()
        {
            List<Letter> letters = new List<Letter>();

            Letter letterA = new Letter { ID = 1, Statement = "Mike" };
            Letter LetterB = new Letter { ID = 2, Statement = "Emma" };
            Letter LetterC = new Letter { ID = 3, Statement = "Peter" };

            letters.Add(letterA);
            letters.Add(LetterB);
            letters.Add(LetterC);



            return letters.AsQueryable();
        }


    }
}

Answer 1

The error was due to the problem that .svc file wasn't being served.. The problem got solved with the kind help from the Kyle Abraham on Experts Exchange.

https://www.experts-exchange.com/questions/29084691/RIA-Service-Error-in-a-Silverlight-Application.html

The solution was to add the following line to the webserver section of the Webconfig

<handlers>
  <add name=".svc" verb="*" path="*.svc" type="System.ServiceModel.Activation.ServiceHttpHandlerFactory, System.ServiceModel.Activation, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
</handlers>