NullReferenceException MVC4 C# Most likely beginner fail

Question

I have been following

http://pluralsight.com/training/Courses/TableOfContents/mvc4-building

to learn some MVC C# for my Company, btw completely amazing Video.

I am populating a View with a SQL source.

In Debug I can definitely tell all my connections work, and I get to my foreach loop that should display all the data in that table

On my @Foreach( var item in Model ) it throws the NullRefException on my Model... here's the code I have

this is my complete view

@model IEnumerable<OilNGasWeb.ModelData.Clients>

@{
    ViewBag.Title = "CLS-Group";
}


@foreach(var item in Model)

{
    <div>
        <h4>@item.Client</h4>
        <div>@item.Address</div>
        <div>@item.City</div>
        <div>@item.State</div>
        <div>@item.Zip</div>
        <div>@item.ContactName</div>
        <div>@item.ContactEmail</div>
        <div>@item.County</div>
        <div>@item.Authorized</div>
        <hr />
    </div>
}

So I'm thinking it is instantiated here

@model IEnumerable<OilNGasWeb.ModelData.Clients>

but just incase I was wrong maybe it's instantiated in the Home controller in the Index Action?

 public ActionResult Index()
    {
        var Model = _db.Clients.ToList();

        return View();
    }

Please help me figure out why it's throwing this exception thanks. I wouldn't think you needed more code. but if you do let me know what M , V , C to post for you, as said above the data part works great.

You'll need to pass the Model to the View as a parameter of the View() Method. — mboldt, Jun 19 '13 at 17:46
Almost all cases of `NullReferenceException` are the same. Please see "[What is a NullReferenceException in .NET?](http://stackoverflow.com/questions/4660142/what-is-a-nullreferenceexception-in-net)" for some hints. — John Saunders, Jun 19 '13 at 17:50
Sry John, it wasnt that i didnt know what it was , but rather where to find the dang thing... but thanks — Pakk, Jun 19 '13 at 20:22

score 6 · Accepted Answer · answered Jun 19 '13 at 17:46

6

public ActionResult Index()
{
    var model = _db.Clients.ToList();

    return View(model);
}

You need to pass the model to the view, otherwise it will be null.

answered Jun 19 '13 at 17:46

glosrob

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Awesome .... thanks, atleast i didn't waste too much time on that issue :) thanks again will set as answered in about 3 min when it lets me – Pakk Jun 19 '13 at 17:55
There any way you would be able to tell me if I had a model with countys that are one-to-many with Clients model, if i can pass them both or atleast pass the client id with the county model? – Pakk Jun 24 '13 at 15:18
1

It's beyond the scope of this question but: short answer yes. Longer answer: review the concept of ViewModels https://www.google.co.uk/search?q=view+models+asp+net+3 – glosrob Jun 24 '13 at 16:33

NullReferenceException MVC4 C# Most likely beginner fail

1 Answers1