Hello,

My name is Alex, it's nice to join the community. I'm a graphic designer in Plymouth UK that also does some light Umbraco Development work on the side. I say light because most of my working knowledge of Umbraco (and c# for that matter) is hacked together from different places and tutorials.

I've come up against a problem when trying to follow the documentation here.

When trying to view Profile.cshtml through the site I get the error:

No parameterless constructor defined for this object. Exception Details: System.MissingMethodException: No parameterless constructor defined for this object.

I've put the full stack trace at the bottom.

My intention is to have Profile.csthml use a custom model that inherits USNBaseViewModel. So that Profile template can be used with the layout components in the uSkinned theme.

I'm really stumped as to why this doesn't work, my model has a constructor that follows the documentation and other models in my own project. Why do those models when used by the site not return 'No parameterless constructor defined'? Any help or advice on how to go about resolving it would be great! Also are there any tips of beginner guides to understanding the stack trace outputs?

Many thanks for any and all help/pointers/clues. :)

My Code:

WtdMemberProfileController.cs - Controller

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Umbraco.Core.Models;

namespace gy_ccg_local.App_Code.WTDControllers
{
    public class WtdMemberProfileController : Umbraco.Web.Mvc.RenderMvcController
    {
        // GET: WtdMemberProfile
        public ActionResult Profile(WTDModels.WtdMemberProfileModel model)
        {
            var _profileModel = new WTDModels.WtdMemberProfileModel((IPublishedContent)model);

            //return CurrentTemplate(_profileModel);

            return CurrentTemplate(_profileModel);
        }
    }
}

WtdMemberProfile.cs - Model

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using Umbraco.Core.Models;
using Umbraco.Web.Models;
using USN.USNModels;

namespace gy_ccg_local.App_Code.WTDModels
{
    public class WtdMemberProfileModel : USNBaseViewModel
    {
        public WtdMemberProfileModel(IPublishedContent content) 
            : base(content)
        {

        }
    }
}

Profile.cshtml - View

@inherits Umbraco.Web.Mvc.UmbracoViewPage<gy_ccg_local.App_Code.WTDModels.WtdMemberProfileModel>


@using ContentModels = Umbraco.Web.PublishedContentModels;
@using USN.USNModels
@using gy_ccg_local.App_Code.WTDModels

@{
    Layout = "USNMaster.cshtml";
    WtdMemberProfileModel profilePage = (WtdMemberProfileModel)Model.Content;
}

Stack Trace

[MissingMethodException: No parameterless constructor defined for this object.]
   System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor, Boolean& bNeedSecurityCheck) +0
   System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark) +119
   System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark) +232
   System.Activator.CreateInstance(Type type, Boolean nonPublic) +83
   System.Activator.CreateInstance(Type type) +11
   System.Web.Mvc.DefaultModelBinder.CreateModel(ControllerContext controllerContext, ModelBindingContext bindingContext, Type modelType) +197

[MissingMethodException: No parameterless constructor defined for this object. Object type 'gy_ccg_local.App_Code.WTDModels.WtdMemberProfileModel'.]
   System.Web.Mvc.DefaultModelBinder.CreateModel(ControllerContext controllerContext, ModelBindingContext bindingContext, Type modelType) +233
   System.Web.Mvc.DefaultModelBinder.BindComplexModel(ControllerContext controllerContext, ModelBindingContext bindingContext) +531
   System.Web.Mvc.DefaultModelBinder.BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext) +330
   System.Web.Mvc.ControllerActionInvoker.GetParameterValue(ControllerContext controllerContext, ParameterDescriptor parameterDescriptor) +331
   System.Web.Mvc.ControllerActionInvoker.GetParameterValues(ControllerContext controllerContext, ActionDescriptor actionDescriptor) +105
   System.Web.Mvc.Async.<>c__DisplayClass21.<BeginInvokeAction>b__19(AsyncCallback asyncCallback, Object asyncState) +743
   System.Web.Mvc.Async.WrappedAsyncResult`1.CallBeginDelegate(AsyncCallback callback, Object callbackState) +14
   System.Web.Mvc.Async.WrappedAsyncResultBase`1.Begin(AsyncCallback callback, Object state, Int32 timeout) +128
   System.Web.Mvc.Async.AsyncControllerActionInvoker.BeginInvokeAction(ControllerContext controllerContext, String actionName, AsyncCallback callback, Object state) +343
   System.Web.Mvc.Controller.<BeginExecuteCore>b__1c(AsyncCallback asyncCallback, Object asyncState, ExecuteCoreState innerState) +25
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallBeginDelegate(AsyncCallback callback, Object callbackState) +30
   System.Web.Mvc.Async.WrappedAsyncResultBase`1.Begin(AsyncCallback callback, Object state, Int32 timeout) +128
   System.Web.Mvc.Controller.BeginExecuteCore(AsyncCallback callback, Object state) +465
   System.Web.Mvc.Controller.<BeginExecute>b__14(AsyncCallback asyncCallback, Object callbackState, Controller controller) +18
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallBeginDelegate(AsyncCallback callback, Object callbackState) +20
   System.Web.Mvc.Async.WrappedAsyncResultBase`1.Begin(AsyncCallback callback, Object state, Int32 timeout) +128
   System.Web.Mvc.Controller.BeginExecute(RequestContext requestContext, AsyncCallback callback, Object state) +374
   System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.BeginExecute(RequestContext requestContext, AsyncCallback callback, Object state) +16
   System.Web.Mvc.MvcHandler.<BeginProcessRequest>b__4(AsyncCallback asyncCallback, Object asyncState, ProcessRequestState innerState) +52
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallBeginDelegate(AsyncCallback callback, Object callbackState) +30
   System.Web.Mvc.Async.WrappedAsyncResultBase`1.Begin(AsyncCallback callback, Object state, Int32 timeout) +128
   System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContextBase httpContext, AsyncCallback callback, Object state) +369
   System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContext httpContext, AsyncCallback callback, Object state) +48
   System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.BeginProcessRequest(HttpContext context, AsyncCallback cb, Object extraData) +16
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +103
   System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +48
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +159