static public KeyValuePair <K, V> GetAt <V, K>(this IL9 <K, V> il9, int index) where K : IComparable
{
if (index >= il9.Count || index < 0)
{
throw new IndexOutOfRangeException();
}
int i = 0;
foreach (var pair in il9.Elements())
{
if (i == index)
{
return(pair);
}
i++;
}
return(new KeyValuePair <K, V>());
}
static public V Last <V, K>(this IL9 <K, V> il9) where K : IComparable
{
return(il9.GetAt(il9.Count - 1).Value);
}
