public void Del(int index)
{
DoublyNode <T> inode = GetNode(index);
inode.Prev.Next = inode.Next;
inode.Next.Prev = inode.Prev;
if (index == 0)
{
_linkHead = inode.Next;
}
_count--;
}
public void AppendEnd(T data)
{
if (_count == 0)
{
_linkHead = new DoublyNode <T>(data, null, null);
goto endAddCount;
}
else
{
var node = GetNode(_count - 1);
var newNode = new DoublyNode <T>(data, _linkHead, node);
_linkHead.Prev = newNode;
node.Next = newNode;
goto endAddCount;
}
endAddCount:
_count++;
}
public void Insert(int index, T data)
{
if (index == 0 && _count == 0)
{
AppendEnd(data);
return;
}
if (index == 0)
{
var prevNode = GetNode(_count - 1);
var nextNode = GetNode(index);
var newNode = new DoublyNode <T>(data, nextNode, prevNode);
prevNode.Next = newNode;
nextNode.Prev = newNode;
goto endAddCount;
}
else
{
//末尾
if (index == _count - 1)
{
var prevNode = GetNode(index);
var nextNode = _linkHead;
var newNode = new DoublyNode <T>(data, nextNode, prevNode);
prevNode.Next = newNode;
_linkHead.Prev = newNode;
goto endAddCount;
}
else
{
var prevNode = GetNode(index - 1);
var nextNode = GetNode(index);
var newNode = new DoublyNode <T>(data, nextNode, prevNode);
prevNode.Next = newNode;
nextNode.Prev = newNode;
goto endAddCount;
}
}
endAddCount:
_count++;
}
public DoublyNode(T data, DoublyNode <T> next, DoublyNode <T> prev)
{
Data = data;
Next = next;
Prev = prev;
}