public void deleteAt(int index)
{
if (index < 0 || index > Size && Size != 0)
{
throw new InvalidOperationException();
}
else if (index == 0)
{
if (First == null)
{
throw new InvalidOperationException();
}
else
{
DLLNode <T> temp = First;
if (First.Next != null)
{
First.Next.Previous = null;
}
First = First.Next;
temp = null;
Size--;
}
}
else if (index == Size - 1)
{
if (Last == null)
{
throw new InvalidOperationException();
}
else
{
DLLNode <T> temp = Last;
if (Last.Previous != null)
{
Last.Previous.Next = null;
}
Last = Last.Previous;
temp = null;
Size--;
}
}
else
{
int count = 0;
Current = First;
while (Current != null && count != index)
{
Current = Current.Next;
count++;
}
Current.Previous.Next = Current.Next;
Current.Next.Previous = Current.Previous;
Size--;
}
}
public void insertAt(T newElement, int index)
{
if (index < 0 || index > Size && Size != 0)
{
throw new InvalidOperationException();
}
else if (index == 0)
{
DLLNode <T> newNode = new DLLNode <T>(newElement);
if (First == null)
{
First = Last = newNode;
}
else
{
newNode.Next = First;
First = newNode;
newNode.Next.Previous = First;
}
Size++;
}
else if (index == Size)
{
DLLNode <T> newNode = new DLLNode <T>(newElement);
if (First == null)
{
First = Last = newNode;
}
else
{
Last.Next = newNode;
newNode.Previous = Last;
Last = newNode;
}
Size++;
}
else
{
int count = 0;
Current = First;
while (Current != null && count != index)
{
Current = Current.Next;
count++;
}
DLLNode <T> newNode = new DLLNode <T>(newElement);
Current.Previous.Next = newNode;
newNode.Previous = Current.Previous;
Current.Previous = newNode;
newNode.Next = Current;
Size++;
}
}
public void clear()
{
while (!isEmpty())
{
DLLNode <T> temp = First;
if (First.Next != null)
{
First.Next.Previous = null;
}
First = First.Next;
temp = null;
Size--;
}
}
public void display()
{
if (First == null)
{
Console.WriteLine("empty");
return;
}
Current = First;
int count = 1;
while (Current != null)
{
Console.WriteLine("Element {0}: {1}", count, Current.Value);
count++;
Current = Current.Next;
}
}
public bool contains(T value)
{
Current = First;
int index = 0;
while (Current != null && !Current.Value.Equals(value))
{
Current = Current.Next;
index++;
}
if (index != Size)
{
return(true);
}
else
{
return(false);
}
}
public int getIndex(T value)
{
Current = First;
int index = 0;
while (Current != null && !Current.Value.Equals(value))
{
Current = Current.Next;
index++;
}
if (index != Size)
{
return(index);
}
else
{
return(0);
}
}
public T getValue(int index)
{
Current = First;
int count = 0;
while (Current != null && count != index)
{
Current = Current.Next;
count++;
}
if (Current != null)
{
return(Current.Value);
}
else
{
return(default(T));
}
}
public DoublyLinkedList()
{
Size = 0;
First = Current = Last = null;
}
