Question 87958 in ASP.NET Question posted in
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How to use List or IList in place of IEnumerable in Asp.NET MVC Views name spaces?

My understanding about IList is it implements both IEnumerable and ICollection.
and List is a concrete implementation of IList interface.

So I had used IEnumerable in the view namespaces many times to iterate over model objects.
But when using IList or List in the namespaces, I’m getting an

Server Error in ‘/’ Application

So,

  1. Why is this happening? and
  2. If I want to use List or IList what should be done?

Action in Controller :

private DummyProjectContext db = new DummyProjectContext();
  // GET: BankAccounts
    public ActionResult Index()
    {
        List<BankAccount> ba = db.BankAccounts.ToList();
        return View(ba);
    }

Index.cshtml :

@model IList<DummyProject.Models.BankAccount>

@{
    ViewBag.Title = "Index";
}

<h2>Index</h2>

<p>
    @Html.ActionLink("Create New", "Create")
</p>
<table class="table">
    <tr>
        <th>
            @Html.DisplayNameFor(model => model.Name)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.Amount)
        </th>
        <th></th>
    </tr>

@foreach (var item in Model) {
    <tr>
        <td>
            @Html.DisplayFor(modelItem => item.Name)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.Amount)
        </td>
        <td>
            @Html.ActionLink("Edit", "Edit", new { id=item.Id }) |
            @Html.ActionLink("Details", "Details", new { id=item.Id }) |
            @Html.ActionLink("Delete", "Delete", new { id=item.Id })
        </td>
    </tr>
}

</table>

Well, I know there IEnumerable is sufficient for this example and that should be used. I want to know why using IList or List , I’m getting this error?

Tags:

3

Answers


  1. 0

    I Created Asp.net Project And Added a Dummy List But I Have not gotten that error Maybe Your list Object Is Null.

    Controller:

    var s=new List<string>();
s.add("test");
return view(s);

view:
@model IList<string>

<ul>
  @foreach(var item in Model)
  {
   <li>item</li>
  }
</ul>

    For More trouble shooting:
    Please copy all the stack trace of an error when You run project for seeing complete error. It maybe occurred for other reason.

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  2. 0

    Your code in the question contains two errors and doesn’t compiling:

    @Html.DisplayNameFor(model => model.Name)
...

@Html.DisplayNameFor(model => model.Amount)
...

    You have to fix these errors.

    UPDATE:

    Just for test, try to replace two lines above by:

    @Html.DisplayNameFor(model => Model.FirstOrDefault().Name)

    and

    @Html.DisplayNameFor(model => Model.FirstOrDefault().Amount)

    Use @model IList<DummyProject.Models.BankAccount> and let me know if will be any changes.

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  3. 0

    You’ll get an error here. Use Inumerable will resolve this error.

    @Html.DisplayNameFor(model => model.Name)
...

@Html.DisplayNameFor(model => model.Amount)
...
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