public void Add(DoublyLinkedListNode <T> node)
{
if (node == null)
{
throw new ArgumentNullException();
}
if (IsEmpty())
{
this.FirstNode = this.LastNode = node;
}
else
{
this.LastNode.Next = node;
node.Prev = this.LastNode;
this.LastNode = this.LastNode.Next;
}
this.Count++;
}
public void Remove(DoublyLinkedListNode <T> node)
{
if (node == null || IsEmpty())
{
throw new InvalidOperationException();
}
if (this.FirstNode == node)
{
this.FirstNode = this.FirstNode.Next;
this.FirstNode.Prev = this.FirstNode ?? null;
}
else if (this.LastNode == node)
{
this.LastNode = this.LastNode.Prev;
this.LastNode.Next = this.LastNode ?? null;
}
else
{
node.Prev.Next = node.Next;
node.Next.Prev = node.Prev;
}
this.Count--;
}
