List() class's extension methods not accessible

Question

I am writing a Windows 8.1 Universal app. In the shared project, I have an object of List class and want to access the ElementAt() extension method.

But the method is not showing up in the Visual Studio 2013's suggestions. If I ignore this and enter it myself, the red squiggly lines showing error appear below ElementAt and the project doesn't build. Can anyone help?

You have to add `using System.Linq;`. It's in `System.Linq.Enumerable`. — Tim Schmelter, Jun 05 '14 at 09:02
@avinash Install ReSharper, it solves more than a few irritations ;-) — Adam Houldsworth, Jun 05 '14 at 09:04
I'm pretty sure this is a duplicate of multiple other questions, but I can't find them... — Thomas Levesque, Jun 05 '14 at 09:08
If you have `List` you can use `list[index]`. Why to go behind linq? — Sriram Sakthivel, Jun 05 '14 at 09:08

Sajeetharan · Accepted Answer · 2014-06-05T09:11:27.447

3

If you want to use Linq Extension methods make sure you include the System.Linq namespace.

edited Jun 05 '14 at 09:11

answered Jun 05 '14 at 09:04

Sajeetharan

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If you have System.Linq imported or VS is not giving you the suggestion to import System.Linq you probably forgot to use await on an async method that returns Task> as you were assigning to a dynamic var? var myList = _myAsyncMethod(); Should be var myList = await _myAsyncMethod(); – Sean Anderson Jan 18 '19 at 23:47

score 2 · Answer 2 · answered Jun 05 '14 at 09:07

Add using System.Linq. What you are trying to use is what is known as an extension method and that is located in a differnt namespace as it is not actually a method on the List object itself.

You have linked the documentation yourself. Have a look at then namespaces and you will see where you have gone wrong.

List() class's extension methods not accessible

2 Answers2