Hello,

I have recently been experiencing with dnn MVC module as i am intersted in moving from vb net  asp webform to C#  dnn Mvc for future module creation.

However, i am having null reference exeption when i want to use @HtmlDisplayFor helper. Reading the doc, i did not see any unsupported mention about this helper.
I would like to know why this is happening but i dont realy know where and what to look for in order to diagnose this.

I am using Christoc MVC Module template generator, and my Test view look like this :

As you can see, exception happens when view is generated and a displayfor tag helper is present. Swaping to no helper or a DisplayTextFor helper works without any problem.

DemoItem class is pretty simple :

    [Cacheable("DemoItems", CacheItemPriority.Default, 20)]
    public class DemoItem
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public DateTime DateCreation { get; set; }
        public DateTime DateModification { get; set; }
    }

Controller too :

namespace Christoc.Modules.DNNModule1.Controllers
{
    [DnnHandleError]
    public class DemoItemController : DnnController
    {
        // GET: DemoItem
        public ActionResult Index()
        {
            var demoItems = new List
            {
                new DemoItem{Id = 1,Name = "DemoItem 1",DateCreation = DateTime.Now },
                new DemoItem{Id = 2,Name = "DemoItem 2",DateCreation = DateTime.Now },
                new DemoItem{Id = 3,Name = "DemoItem 3",DateCreation = DateTime.Now },
                new DemoItem{Id = 4,Name = "DemoItem 4",DateCreation = DateTime.Now } 
            };

}

StackTrace :

Ex.Message = Object reference not set to an instance of an object.
Ex.Source = DotNetNuke.Web.Mvc
Stacktrace =    at DotNetNuke.Web.Mvc.Framework.ModuleDelegatingViewEngine.RunAgainstModuleViewEngines(ControllerContext controllerContext, Func`2 engineRequest)
   at System.Web.Mvc.ViewEngineCollection.Find(Func`2 lookup, Boolean trackSearchedPaths)
   at System.Web.Mvc.ViewEngineCollection.FindPartialView(ControllerContext controllerContext, String partialViewName)
   at System.Web.Mvc.Html.TemplateHelpers.ExecuteTemplate(HtmlHelper html, ViewDataDictionary viewData, String templateName, DataBoundControlMode mode, GetViewNamesDelegate getViewNames, GetDefaultActionsDelegate getDefaultActions)
   at System.Web.Mvc.Html.TemplateHelpers.TemplateHelper(HtmlHelper html, ModelMetadata metadata, String htmlFieldName, String templateName, DataBoundControlMode mode, Object additionalViewData, ExecuteTemplateDelegate executeTemplate)
   at System.Web.Mvc.Html.TemplateHelpers.TemplateHelper(HtmlHelper html, ModelMetadata metadata, String htmlFieldName, String templateName, DataBoundControlMode mode, Object additionalViewData)
   at System.Web.Mvc.Html.TemplateHelpers.TemplateFor[TContainer,TValue](HtmlHelper`1 html, Expression`1 expression, String templateName, String htmlFieldName, DataBoundControlMode mode, Object additionalViewData)
   at System.Web.Mvc.Html.DisplayExtensions.DisplayFor[TModel,TValue](HtmlHelper`1 html, Expression`1 expression)
   at ASP._Page_DesktopModules_MVC_DNNModule1_Views_DemoItem_Index_cshtml.Execute() in c:\inetpub\wwwdnn\DesktopModules\MVC\DNNModule1\Views\DemoItem\Index.cshtml:line 21

Any help or hints is welcome.