Value cannot be null.Parameter name: key

Question

Hi,

Value cannot be null.Parameter name: key

I have started to get this error since i ve implemented the StructureMapControllerFactory as my DefaultControllerFactory.

Actually i copied the code from MVC Sample App StoreFront, but i couldn't figure out why this error keeps popping up. Even this error show up the application still runs.

What might be the reason of this error ?

Thanks for your time

Answer 1

System.ArgumentNullException was unhandled by user code
  Message="Value cannot be null.\r\nParameter name: key"
  Source="mscorlib"
  ParamName="key"
  StackTrace:
       at System.ThrowHelper.ThrowArgumentNullException(ExceptionArgument argument)
       at System.Collections.Generic.Dictionary`2.FindEntry(TKey key)
       at System.Collections.Generic.Dictionary`2.ContainsKey(TKey key)
       at StructureMap.Util.Cache`2.get_Item(KEY key)
       at StructureMap.BuildSession.CreateInstance(Type pluginType)
       at StructureMap.Container.GetInstance(Type pluginType)
       at StructureMap.ObjectFactory.GetInstance(Type pluginType)
       at Yacht.Web.Controllers.StructureMapControllerFactory.GetControllerInstance(RequestContext requestContext, Type controllerType) in D:\Documents\WebSites\JOBS\Yacht\Yacht.Web\Controllers\StructureMapControllerFactory.cs:line 16
       at System.Web.Mvc.DefaultControllerFactory.CreateController(RequestContext requestContext, String controllerName)
       at System.Web.Mvc.MvcHandler.ProcessRequestInit(HttpContextBase httpContext, IController& controller, IControllerFactory& factory)
       at System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContextBase httpContext, AsyncCallback callback, Object state)
       at System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContext httpContext, AsyncCallback callback, Object state)
       at System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.BeginProcessRequest(HttpContext context, AsyncCallback cb, Object extraData)
       at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
       at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
  InnerException:

and this is the StructureMapControllerFactory class

public class StructureMapControllerFactory : DefaultControllerFactory
    {
        protected override IController GetControllerInstance(System.Web.Routing.RequestContext requestContext, Type controllerType)
        {
            return ObjectFactory.GetInstance(controllerType) as Controller;
        }
    }

Answer 2

See anurse's answer to StructureMap error when invalid controller.