public override string ToString()
{
string s = string.Empty;
if (tail == null)
{
return(s);
}
TWNode temp = head;
for (int i = 0; i < _count; i++)
{
s += temp.ToString() + " ";
temp = temp.next;
}
return(s);
}
public void AfterMove(int step)
{
if (step < 0)
{
throw new ArgumentOutOfRangeException("step", "setp < 0");
}
if (_count == 0)
{
throw new NullReferenceException("集合中元素为空!");
}
for (int i = 0; i < step; i++)
{
if (curr == curr.next)
{
continue;
}
curr = curr.next;
}
}
public void Add(object value)
{
TWNode node = new TWNode(value);
if (_count == 0)
{
head = node;
tail = node;
curr = node;
node.prev = node;
node.next = node;
}
else
{
tail.next = node;
node.prev = tail;
node.next = node;
tail = node;
}
_count++;
}
/// <summary>
/// 删除当前元素
/// </summary>
public void RemoveCurrNode()
{
//为空
if (tail == null)
{
throw new NullReferenceException("集合中元素为空!");
}
else if (_count == 1)
{
tail = null;
head = null;
curr = null;
}
else
{
if (curr.prev == curr)
{
head = curr.next;
head.prev = head;
curr = head;
}
else if (tail.next == tail)
{
tail = tail.prev;
tail.next = tail;
curr = tail;
}
else
{
curr.prev.next = curr.next;
curr.next.prev = curr.prev;
curr = curr.next;
}
}
_count--;
}
