MVC5 Razor NullReferenceException in Model

Question

For some reason I'm getting a NullReferenceException whenever I try to access my model.

Here is the code from my controller:

public async Task<ActionResult> Bar(string fooSlug, int barId)
{
    var foo = await mediaService.GetFoo(fooSlug);
    var bar = await barService.GetBarFromFooByTitleId(foo.TitleId, barId);
    var viewModel = new ViewModels.BarViewModel(foo, bar);
    return View(viewModel);
}

Code from the ViewModel:

public class BarViewModel
{
    public Models.Sub.FooDetails Foo{ get; set; }
    public Models.Sub.BarDetails Bar { get; set; }

    public BarViewModel(Models.Sub.FooDetails foo, Models.Sub.BarDetails bar) 
    {
        this.Foo = foo;
        this.Bar = bar;
    }
}

And my View:

@model FooBar.ViewModels.BarViewModel

@{
    ViewBag.Title = "Bar";
}

<h2>@Model.Bar.Name</h2>

It keeps returning a NullReferenceException When I try to use it inside the h2 tag. I've debugged it and the .Name property has the correct value, but when I press continue it will just throw the error.

Does anyone have a solution for this problem?

Step through the code in a debugger to ensure all objects are initialized. Looks like maybe Bar is null on the Model object — TGH, Mar 14 '14 at 17:58
That is the problem. It's not null, but it still throws an error. When I step through the code and hover over the ".Name" it will show the proper value. — sgtfrankieboy, Mar 14 '14 at 18:01
Not sure about this. Try to check the next C# statement using quick watch. — Sandeep Kumar, Mar 14 '14 at 18:03
When I return the statement through QuickWatch, It returns the proper value. — sgtfrankieboy, Mar 14 '14 at 18:06
Did you checked the C# statement coming after
@Model.Bar.Name
Post the stack trace it will surely help to resolve the issue. — Sandeep Kumar, Mar 14 '14 at 18:09
It was using a Lambda but I removed it anyways and tried it again. Everything loads properly now. It looks like that it was returning null but showing the exception in the previous statement. — sgtfrankieboy, Mar 14 '14 at 18:12
Does it run without errors outside debugger? Try doing a build. — shahkalpesh, Mar 14 '14 at 18:14

score 46 · Accepted Answer · answered Mar 14 '14 at 18:52

46

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.

answered Mar 14 '14 at 18:52

Sandeep Kumar

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This helped me so much with my issue! Thank you! -- http://stackoverflow.com/questions/26491175/system-nullreferenceexception-in-app-web-dll/26536270#26536270 – MaylorTaylor Oct 23 '14 at 19:54

MVC5 Razor NullReferenceException in Model

@Model.Bar.Name

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