public IEnumerable <TValue> LessThanOrEqual(TKey ltKey)
{
int compare = comparer.Compare(theKey, ltKey);
if (compare > 0)
{
foreach (var value in Left.LessThanOrEqual(ltKey))
{
yield return(value);
}
yield break;
}
foreach (var value in Left.LessThanOrEqual(ltKey))
{
yield return(value);
}
yield return(Value);
if (compare == 0)
{
yield break;
}
foreach (var value in Right.LessThanOrEqual(ltKey))
{
yield return(value);
}
}