public void RemoveLast()
{
if (Count == 0)
{
return;
}
if (Count == 1)
{
Head = null;
Tail = null;
}
else
{
var current = Head;
while (current.Next != Tail)
{
current = current.Next;
}
current.Next = null;
Tail = current;
}
Count--;
}
public IEnumerator <T> GetEnumerator()
{
CustomNode.LinkedListNode <T> current = Head;
while (current != null)
{
yield return(current.Value);
current = current.Next;
}
}
public void AddFirst(CustomNode.LinkedListNode <T> node)
{
node.Next = Head;
Head = node;
Count++;
if (Count == 1)
{
Tail = Head;
}
}
public void RemoveFirst()
{
if (Count != 0)
{
Head = Head.Next;
Count--;
if (Count == 0)
{
Tail = null;
}
}
}
public void AddLast(CustomNode.LinkedListNode <T> node)
{
if (Count == 0)
{
Head = node;
}
else
{
Tail.Next = node;
}
Tail = node;
Count++;
}
public bool Remove(T item)
{
var current = Head;
CustomNode.LinkedListNode <T> previous = null;
//1. Empty List - do nothing.
//2. Single Node: previous is null.
//3. Multiple Nodes:
// a. node to remove is first.
// b. note to remove is the middle or last.
while (current != null)
{
if (current.Value.Equals(item))
{
if (previous != null)
{
previous.Next = current.Next;
if (current.Next == null)
{
Tail = current;
}
Count--;
}
else
{
RemoveFirst(); //case 2, 3a
}
return(true);
}
previous = current;
current = current.Next;
}
return(false);
}
