public void AddRangeFirst(IList <T> list)
{
if (list != null)
{
DoubleLinkedList <T> doubleList = DoubleLinkedList <T> .Create(list.ToArray());
if (Length == 0)
{
_root = doubleList._root;
_tail = doubleList._tail;
Length = doubleList.Length;
}
else if (doubleList.Length != 0)
{
_root.Previous = doubleList._tail;
doubleList._tail.Next = _root;
_root = doubleList._root;
Length += doubleList.Length;
}
}
else
{
throw new NullReferenceException("List is null");
}
}
public void AddRangeByIndex(int index, IList <T> list)
{
if (list != null)
{
DoubleLinkedList <T> doubleList = DoubleLinkedList <T> .Create(list.ToArray());
if (index >= 0 && index <= Length)
{
if (index == 0)
{
AddRangeFirst(list);
}
else if (index == Length)
{
AddRange(list);
}
else
{
DoubleLinkedListNode <T> currentNode = GetNodeByIndex(index - 1);
doubleList._root.Previous = currentNode;
currentNode.Next.Previous = doubleList._tail;
doubleList._tail.Next = currentNode.Next;
currentNode.Next = doubleList._root;
Length += doubleList.Length;
}
}
else
{
throw new IndexOutOfRangeException();
}
}
else
{
throw new NullReferenceException("List is null");
}
}