Question

I am trying to use NServiceBus with an ASP.NET MVC 2 website (using VS 2010 and the .NET 4.0 framework). However, when I run the site on my local machine, I get the following error:

Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.

Here are the relevant steps I have taken:

• Downloaded the NServiceBus.2.0.0.1145 binaries
• In my asp.net mvc app, I’ve added references to NServiceBus.dll and NServiceBus.Core.dll
• In Global.asax.cs I’ve added:

public static IBus Bus { get; private set; }
protected void Application_Start()
{
    AreaRegistration.RegisterAllAreas();
    RegisterRoutes(RouteTable.Routes);

    Bus = NServiceBus.Configure
        .WithWeb()
        .Log4Net()
        .DefaultBuilder()
        .XmlSerializer()
        .MsmqTransport()
            .IsTransactional(false)
            .PurgeOnStartup(false)
        .UnicastBus()
            .ImpersonateSender(false)
        .CreateBus()
        .Start();
}

• In web.config, I’ve added:

<MsmqTransportConfig 
  InputQueue="MyWebClient" 
  ErrorQueue="error" 
  NumberOfWorkerThreads="1" 
  MaxRetries="5"/>

<UnicastBusConfig>
  <MessageEndpointMappings>
    <add Messages="Messages" Endpoint="MyServerInputQueue"/>
  </MessageEndpointMappings>
</UnicastBusConfig>

The error indicates that the problem is with the first line in the Global.asax.cs file. Is it possible that there is a problem with NServiceBus running under .NET 4.0?

Answer 1

Check the LoaderExceptions and see which assembly it’s complaining about, then exclude it by calling Configure.With(AllAssemblies.Except(“problematicAssembly.dll”) instead of Configure.WithWeb() and leave the rest of the fluent initialization code the same.