public void AddLast(T element)
{
var newTail = new CustomNode <T>(element);
if (this.Count == 0)
{
this.tail = this.head = newTail;
}
else
{
newTail.Previous = this.tail;
this.tail.Next = newTail;
this.tail = newTail;
}
this.Count++;
}
public void AddFirst(T element)
{
var newHead = new CustomNode <T>(element);
if (this.Count == 0)
{
this.head = this.tail = newHead;
}
else
{
newHead.Next = this.head;
this.head.Previous = newHead;
this.head = newHead;
}
this.Count++;
}
public T RemoveLast()
{
if (this.Count == 0)
{
throw new InvalidOperationException("The list is empty");
}
var removedElement = this.tail.Value;
var newTail = this.tail.Previous;
if (this.Count == 1)
{
this.tail = this.head = null;
}
else
{
newTail.Next = null;
this.tail = newTail;
}
this.Count--;
return(removedElement);
}
public T RemoveFirst()
{
if (this.Count == 0)
{
throw new InvalidOperationException("The list is empty");
}
T removedElement = this.head.Value;
var newHead = this.head.Next;
if (this.Count == 1)
{
this.head = this.tail = null;
}
else
{
newHead.Previous = null;
this.head = newHead;
}
this.Count--;
return(removedElement);
}