/// <summary>
/// returns item at <paramref name="index"/> in <paramref name="array"/>
/// if <paramref name="index"/>.HasValue, null otherwise.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="array"></param>
/// <param name="index"></param>
/// <returns>
/// item at <paramref name="index"/> in <paramref name="array"/>
/// if <paramref name="index"/>.HasValue
/// else null
/// </returns>
public static T GetItemAtIndexOrNull <T>(this T[] array, int?index) where T : class
{
T itemAtIndex;
if (index.HasValue)
{
int indexValue = index.GetValueOrDefault();
ListUtils.AssertItemIndexValid(indexValue, array, "index");
itemAtIndex = array[indexValue];
}
else
{
itemAtIndex = null;
}
return(itemAtIndex);
}
