public IEnumerator <T> GetEnumerator()
=> RangeStartIndex < 0
? Reverse
? ViewedCollection.GetReverseEnumerator()
: ViewedCollection.GetEnumerator()
: Reverse
? ViewedCollection.GetReverseEnumerator(
RangeStartIndex + Math.Max(0, RangeCount - 1),
RangeCount)
: ViewedCollection.GetEnumerator(RangeStartIndex, RangeCount);
public IEnumerator <T> GetReverseEnumerator(int startIndex, int rangeCount)
{
if (RangeStartIndex >= 0)
{
checkThisRangeCount(rangeCount, startIndex + 1);
}
return(RangeStartIndex < 0
? Reverse
? ViewedCollection.GetEnumerator(
Math.Max(0, ViewedCollection.Count - 1) - startIndex,
rangeCount)
: ViewedCollection.GetReverseEnumerator(startIndex, rangeCount)
: Reverse
? ViewedCollection.GetEnumerator(
(RangeStartIndex + Math.Max(0, RangeCount - 1)) - startIndex,
rangeCount)
: ViewedCollection.GetReverseEnumerator(RangeStartIndex + startIndex, rangeCount));
}