How I can convert System.Collection.IEnumerable to List in c#?

Question

How I can convert System.Collection.IEnumerable to list in c#? Actually I am executing a store procedure that is giving me ResultSets in System.Collection.IEnumerable and I want to convert that result set to c# List<User>.

Note I don't want to use any loop. Is there a way of type casting!

@CircleHsiao This is not a duplicate. Be aware of author ask for IEnumerable and not IEnumerable here. — Sebi, Feb 24 '17 at 10:00
@CircleHsiao This is not an duplicate, because your question mention IEnumerable but the author means IEnumerable. — Sebi, Feb 24 '17 at 10:00

Sebi · Accepted Answer · 2017-02-24T06:04:09.807

23

You can use the following:

IEnumerable myEnumerable = GetUser();
List<User> myList = myEnumerable.Cast<User>().ToList();

As Lasse V. Karlsen suggest in his comment instead of Cast<User> you can also use OfType<User>();

If your IEnumerable is generic by default which I don't think because of your namespace in question: System.Collection.IEnumerable you could easily use:

IEnumerable<User> myEnumerable = GetUser();
List<User> myList = myEnumerable.ToList();

edited Feb 24 '17 at 06:04

answered Feb 24 '17 at 05:56

Sebi

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Or he could use OfType – Lasse V. Karlsen Feb 24 '17 at 05:57
@LasseV.Karlsen Thank you for suggestion I update my answer. – Sebi Feb 24 '17 at 05:59

score 0 · Answer 2 · answered Feb 24 '17 at 05:54

0

You should be able to just use Linq's ToList() method.

List<string> collection = myEnumCollection.ToList();

answered Feb 24 '17 at 05:54

Chris Cruz

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This won't work because the OP ask for System.Collection.IEnumerable and not using System.Collections.Generic.IEnumerable – Sebi Feb 24 '17 at 06:05

How I can convert System.Collection.IEnumerable to List in c#?

2 Answers2