public void Add(T element, int?position = null)
{
position = position ?? this.Length;
if ((position < 0) || (position > this.Length))
{
throw new ArgumentOutOfRangeException();
}
if (position == 0)
{
this.first = new DoublyLinkedElement <T>(element, next: first);
this.Length++;
return;
}
DoublyLinkedElement <T> pointer = this.first;
for (int i = 1; i < position; i++)
{
pointer = pointer.Next;
}
if (pointer.Next == null)
{
pointer.Next = new DoublyLinkedElement <T>(element, previous: pointer);
}
else
{
DoublyLinkedElement <T> inserted = new DoublyLinkedElement <T>(element, previous: pointer, next: pointer.Next);
pointer.Next.Previous = inserted;
pointer.Next = inserted;
}
this.Length++;
}
public void Remove(int num)
{
if ((num < 0) || (num >= this.Length))
{
return;
}
if (num == 0)
{
if (this.first.Next != null)
{
this.first.Next.Previous = null;
}
this.first = first.Next;
this.Length--;
return;
}
DoublyLinkedElement <T> pointer = this.first;
for (int i = 0; i < num; i++)
{
pointer = pointer.Next;
}
if (pointer.Next != null)
{
pointer.Next.Previous = pointer.Previous;
}
pointer.Previous.Next = pointer.Next;
this.Length--;
}
public T[] ToArray()
{
T[] result = new T[this.Length];
DoublyLinkedElement <T> pointer = this.first;
for (int i = 0; i < this.Length; i++)
{
result[i] = pointer.content;
pointer = pointer.Next;
}
return(result);
}
public override string ToString()
{
string s = "";
DoublyLinkedElement <T> pointer = this.first;
for (int i = 0; i < this.Length - 1; i++)
{
s += String.Format("{0}<->", pointer.content.ToString());
pointer = pointer.Next;
}
s += String.Format("{0}", pointer.content.ToString());
return(s);
}
public int IndexOf(T element)
{
DoublyLinkedElement <T> pointer = this.first;
int num = 0;
while (pointer != null)
{
if (pointer.content.Equals(element))
{
return(num);
}
pointer = pointer.Next;
num++;
}
return(-1);
}
public DoublyLinkedElement(T el, DoublyLinkedElement <T> previous = null, DoublyLinkedElement <T> next = null)
{
content = el;
this.Previous = previous;
this.Next = next;
}
