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

Here is my solution:

public static int IndexOfMax(this IList source)
{
    if (source == null)
        throw new ArgumentNullException("source");
    if (source.Count == 0)
        throw new InvalidOperationException("List contains no elements");

    int maxValue = source[0];
    int maxIndex = 0;
    for (int i = 1; i < source.Count; i++)
    {
        int value = source[i];
        if (value > maxValue)
        {
            maxValue = value;
            maxIndex = i;
        }
    }
    return maxIndex;
}