How do I use LINQ in an ASP.NET Razor MVC4 view?

Question

I have an ASP.NET Razor MVC4 view with the following @using statement at the top to include LINQ in the page.

@using System.Linq

Then I have a loop where I want to access specific elements of the contents of a System.Collections.Generic.Dictionary object (@Model.content). In this case,

element 1->last.

    @for (int i = 1; i < @Model.content.Count; i++)
    {
        <li class="bullet">
          @Model.content.ElementAt(i)
        </li>
    }

I am receiving the following error.

'System.Collections.Generic.Dictionary' does not contain a definition for 'ElementAt'

What do I need to do to utilize LINQ in this Razor view?

I know I could use a foreach to iterate all the elements, but in this situation need to access specific elements.

This one is for MVC3, but it's probably still relevant: stackoverflow.com/questions/5896842/… — valverij
– valverij, Commented Apr 29, 2013 at 16:27

Justin Niessner · Accepted Answer · 2013-04-29 16:22:33Z

4

You could make System.Linq work for your purpose, but I would strongly suggest against it.

You'll wind up iterating your collection multiple times over using ElementAt. As your collection grows, performance will be terrible.

You'd be far better off using a foreach loop and tracking the index yourself (please excuse the razor syntax if it's a bit off):

@{ var counter = 0; }

@foreach(var kvp in @Model.content)
{
    @if(counter > 0){
        <li class="bullet">
            @kvp.Value
        </li>
    }
    @{ counter++; }
}

answered Apr 29, 2013 at 16:22

Justin Niessner

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