/// <summary>
/// 把某个节点移动到头部
/// </summary>
/// <param UIName="pNode"></param>
public void MoveToHead(DoubleLinkedListNode <T> pNode)
{
if (pNode == null || pNode == Head)
{
return;
}
if (pNode.Prev == null && pNode.Next == null)
{
return;
}
if (pNode == Tail)
{
Tail = pNode.Prev;
}
if (pNode.Prev != null)
{
pNode.Prev.Next = pNode.Next;
}
if (pNode.Next != null)
{
pNode.Next.Prev = pNode.Prev;
}
pNode.Prev = null;
pNode.Next = Head;
Head.Prev = pNode;
Head = pNode;
//如果只有两个节点
if (Tail == null)
{
Tail = Head;
}
}
/// <summary>
/// 添加一个节点到头部
/// </summary>
/// <param UIName="pNode"></param>
/// <returns></returns>
public DoubleLinkedListNode <T> AddToHeader(DoubleLinkedListNode <T> pNode)
{
if (pNode == null)
{
return(null);
}
pNode.Prev = null;
if (Head == null)
{
//头部为空 ,链表没有东西, 添加第一个元素 头部等于尾部
Head = Tail = pNode;
}
else
{
pNode.Next = Head;
Head.Prev = pNode;
Head = pNode;
}
_Count++;
return(Head);
}
/// <summary>
/// 添加节点到尾部
/// </summary>
/// <param UIName="pNode"></param>
/// <returns></returns>
public DoubleLinkedListNode <T> AddToTail(DoubleLinkedListNode <T> pNode)
{
if (pNode == null)
{
return(null);
}
pNode.Next = null;
if (Tail == null)
{
//尾部为空 ,链表没有东西, 添加第一个元素 头部等于尾部
Head = Tail = pNode;
}
else
{
pNode.Prev = Tail;
Tail.Next = pNode;
Tail = pNode;
}
_Count++;
return(Tail);
}
