The non-generic type 'System.Collections.IEnumerable' cannot be used with type arguments

c# .net generics queue nodes
Danpe picture Danpe · Aug 3, 2011 · Viewed 38.9k times · Source 
using System.Collections.Generic;

public sealed class LoLQueue<T> where T: class
{
    private SingleLinkNode<T> mHe;
    private SingleLinkNode<T> mTa;

    public LoLQueue()
    {
        this.mHe = new SingleLinkNode<T>();
        this.mTa = this.mHe;
    }
}

Error:

The non-generic type 'LoLQueue<T>.SingleLinkNode' cannot be used with type arguments

Why do i get this?

Answer

David Yaw picture David Yaw · Aug 3, 2011

If you want to use IEnumerable<T>, as your post's title suggests, you need to include using System.Collections.Generic;.

As for the SingleLinkNode class, I don't know where you got it, it's not part of the .NET framework that I can see. I'd guess that it isn't implemented using generics, and you'll need to add a bunch of casts from object to T everywhere.

Related questions

How to get the type of T from a member of a generic class or method?

Let say I have a generic member in a class or method, so: public class Foo<T> { public List<T> Bar { get; set; } public void Baz() { // get type of T } } When I instantiate the class, the …

Read More
ArrayList vs List<> in C#

What is the difference between ArrayList and List<> in C#? Is it only that List<> has a type while ArrayList doesn't?

Read More
A generic list of anonymous class

In C# 3.0 you can create anonymous class with the following syntax var o = new { Id = 1, Name = "Foo" }; Is there a way to add these anonymous class to a generic list? Example: var o = new { Id = 1, Name = "Foo" }; var o1 = new { …

Read More