So, this question was just asked on SO:

http://stackoverflow.com/questions/2740001/how-to-handle-an-infinite-ienumerable

My sample code:

public static void Main(string[] args)
{
    foreach (var item in Numbers().Take(10))
        Console.WriteLine(item);
    Console.ReadKey();
}

public static IEnumerable<int> Numbers()
{
    int x = 0;
    while (true)
        yield return x++;
}

Can someone please explain why this is lazy evaluated? I've looked up this code in Reflector, and I'm more confused than when I began.

Reflector outputs:

public static IEnumerable<int> Numbers()
{
    return new <Numbers>d__0(-2);
}

For the numbers method, and looks to have generated a new type for that expression:

[DebuggerHidden]
public <Numbers>d__0(int <>1__state)
{
    this.<>1__state = <>1__state;
    this.<>l__initialThreadId = Thread.CurrentThread.ManagedThreadId;
}

This makes no sense to me. I would have assumed it was an infinite loop until I put that code together and executed it myself.