Does Class need to implement IEnumerable to use Foreach

Question

This is in C#, I have a class that I am using from some else\'s DLL. It does not implement IEnumerable but has 2 methods that pass back a IEnumerator. Is there a way I can u

Answer 1

No, you don't and you don't even need an GetEnumerator method, e.g.:

class Counter
{
    public IEnumerable Count(int max)
    {
        int i = 0;
        while (i <= max)
        {
            yield return i;
            i++;
        }
        yield break;
    }
}

which is called this way:

Counter cnt = new Counter();

foreach (var i in cnt.Count(6))
{
    Console.WriteLine(i);
}