public IEnumerable <T> BackEnumerator()
{
DoubleNode <T> current = this.tail;
while (current != null)
{
yield return(current.Data);
current = current.Previous;
}
}
public IEnumerator <T> GetEnumerator()
{
DoubleNode <T> current = this.head;
while (current != null)
{
yield return(current.Data);
current = current.Next;
}
}
public bool Contains(T data)
{
DoubleNode <T> current = this.head;
while (current != null)
{
if (current.Data.Equals(data))
{
return(true);
}
current = current.Next;
}
return(false);
}
public void Add(T data)
{
DoubleNode <T> node = new DoubleNode <T>(data);
if (this.head == null)
{
this.head = node;
}
else
{
this.tail.Next = node;
node.Previous = this.tail;
}
this.tail = node;
this.count++;
}
public void AddFirst(T data)
{
DoubleNode <T> node = new DoubleNode <T>(data);
DoubleNode <T> temp = this.head;
node.Next = temp;
this.head = node;
if (this.count == 0)
{
this.tail = this.head;
}
else
{
temp.Previous = node;
}
this.count++;
}
public void Clear()
{
this.head = null;
this.tail = null;
this.count = 0;
}