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System.NullReferenceException in App_Web_*.dll

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I am having an odd issue.

My MVC application seems to be working perfectly fine except for one view page.

The view page in question (Organization/Edit) gets a 'NullReferenceException' on every code item on the page. Whether it is Html.TextBoxFor() or HTML.AntiForgeryToken().

I have my model, view, and controller laid out here on another question that i think is related -- https://stackoverflow.com/questions/26475866/dropdownlistfor-null-reference-error

As you can see below, my model does have information inside of it. This screen capture was taken at the "Return View("Edit", model)" inside the controller.

Exception Details

- Source = App_Web_zu4jlld0 - StackTrace =    at ASP._Page_Views_Organization_Edit_vbhtml.Execute() in C:\Users\mtaylor\Projects\Check Im Here\mtaylor-branch\CheckImHere_v2\CheckImHereMVC\Views\Organization\Edit.vbhtml:line 16    at System.Web.WebPages.WebPageBase.ExecutePageHierarchy()    at System.Web.Mvc.WebViewPage.ExecutePageHierarchy()    at System.Web.WebPages.StartPage.RunPage()    at System.Web.WebPages.StartPage.ExecutePageHierarchy()    at System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage)    at System.Web.Mvc.RazorView.RenderView(ViewContext viewContext, TextWriter writer, Object instance)    at System.Web.Mvc.BuildManagerCompiledView.Render(ViewContext viewContext, TextWriter writer)    at System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context)    at System.Web.Mvc.ControllerActionInvoker.InvokeActionResult(ControllerContext controllerContext, ActionResult actionResult)    at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass1a.<InvokeActionResultWithFilters>b__17()    at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation) 

enter image description here

View

@ModelType CheckImHereMVC.OrganizationEditViewModel  @Using Html.BeginForm("Edit", "Organization", FormMethod.Post)  @Html.AntiForgeryToken() 'get errors here  @Html.ValidationSummary(True) 'get errors here  @Html.TextBoxFor(Function(model) model.organizationSub.subName, New With {.class = "span12"}) 'and errors here End Using 

One thing i notice is that if i comment out my 'textboxfor', my error will occur at the 'ValidationSummary()', if i comment out my 'ValidationSummary()', then my error will occur at 'AntiForgeryToken()'.

So it seems that the error just happens at the last possible code area.

like image 486
MaylorTaylor Avatar asked Oct 21 '14 16:10

MaylorTaylor


People also ask

How do I fix NullReferenceException in C #?

You can eliminate the exception by declaring the number of elements in the array before initializing it, as the following example does. For more information on declaring and initializing arrays, see Arrays and Arrays. You get a null return value from a method, and then call a method on the returned type.

What is System NullReferenceException?

The runtime throwing a NullReferenceException always means the same thing: you are trying to use a reference, and the reference is not initialized (or it was once initialized, but is no longer initialized). This means the reference is null , and you cannot access members (such as methods) through a null reference.

Can NullReferenceException be caught?

Find out which exception you're receiving, and either catch that specific exception, or else prevent it from occurring in the first place. You should never catch NullReferenceException.


1 Answers

I found the answer to my problem here

For anyone finding this:

Try commenting out the next code line AFTER the error.

@ModelType CheckImHereMVC.OrganizationEditViewModel  @Using Html.BeginForm("Edit", "Organization", FormMethod.Post)    @Html.AntiForgeryToken()     @Html.ValidationSummary(True)     @Html.TextBoxFor(Function(model) model.organizationSub.subName, New With {.class = "span12"})    @Html.TextBoxFor(Function(model) model.organizationSub.subTitle, New With {.class = "span12"})    <img src="@Url.Content(Model.img.imgPath)" alt="IMAGES"/> 'commenting out this line fixed my issue End Using 

In the case above, i would get errors on the model.organizationSub.subTitle. If i commented that line out, i would get errors on the model.organizationSub.subName line. I then found the link mentioned and commented out the line AFTER all of my TextBoxFors. That fixed my issue.

From link: "Some times compiler could not point on exact lines having specific kind of errors in razor view may be because it could not keep their line number in stack trace or somewhere. I have found this case with Null Reference Exception and when null is passed in Url.Content.

So it helps to check the next C# statement in razor view when you did not get any error on the line shown by stack trace."

like image 56
MaylorTaylor Avatar answered Oct 19 '22 08:10

MaylorTaylor