public bool MoveNext()
{
if (CurrentNode == null)
{
CurrentNode = Head;
return(true);
}
else if (Head.Element != null && Head.NextElement != null)
{
Head = (TwoLinkedNode <T>)Head.NextElement;
return(true);
}
else
{
return(false);
}
}
public override void Delete(T value)
{
TwoLinkedNode <T> previousfirst = null;
TwoLinkedNode <T> first = (TwoLinkedNode <T>)Head;
TwoLinkedNode <T> last = (TwoLinkedNode <T>)Tail;
TwoLinkedNode <T> previouslast = null;
while (first != null || last != null)
{
if (first.Element.Equals(value))
{
if (previousfirst != null)
{
previousfirst.NextElement = first.NextElement;
last = first;
last.PreviousElement = (TwoLinkedNode <T>)last.NextElement;
{
if (first.NextElement == null)
{
Tail = first;
}
}
return;
}
else
{
Head = (TwoLinkedNode <T>)Head.NextElement;
((TwoLinkedNode <T>)Head).PreviousElement = (((TwoLinkedNode <T>)Head).PreviousElement).PreviousElement;
if (Head == null)
{
Tail = null;
}
return;
}
}
if (last.Element.Equals(value))
{
if (previouslast != null)
{
previouslast.PreviousElement = last.PreviousElement;
first = last;
first.PreviousElement = (TwoLinkedNode <T>)first.NextElement;
{
if (last.PreviousElement == null)
{
Tail = previouslast;
}
}
return;
}
else
{
Tail = ((TwoLinkedNode <T>)Tail).PreviousElement;
((TwoLinkedNode <T>)Tail).NextElement = Tail.NextElement.NextElement;
if (Tail == null)
{
Head = null;
}
return;
}
}
previouslast = last;
last = last.PreviousElement;
previousfirst = first;
first = (TwoLinkedNode <T>)first.NextElement;
}
}
public void Reset()
{
Head = null;
}
public TwoLinkedCustomListEnumerator(TwoLinkedNode <T> head)
{
Head = head;
CurrentNode = null;
}