Obtain the index of the maximum element

Question

Given such a list:

        List intList = new List();
        intList.Add(5);
        intList.Add(10);
        intList.Add(15);
                


        

Answer 1

public static class Extensions
{
    public static int MaxIndex(this IEnumerable TSource)
    {
        int i = -1;
        using (var iterator = TSource.GetEnumerator())
            while (iterator.MoveNext())
                i++;
        return i;
    }
}

Here is my crack at this problem. I returned -1 instead of throwing an exception because this is what the FindIndex function does and I find it very convenient.