public void DeleteLast()
{
if (_first == null)
{
throw new NullReferenceException("Collection is empty");
}
if (_first == _last)
{
_first = _last = null;
Count = 0;
return;
}
_last = _last.Previous;
_last.Next = null;
Count--;
}
public void AddLast(T value)
{
if (_first == null)
{
_last = new DoubleLinkedListNode <T>(value);
_first = _last;
}
else
{
var newNode = new DoubleLinkedListNode <T>(value)
{
Previous = _last
};
_last = newNode;
_last.Previous.Next = _last;
}
Count++;
}
