private void SetPrevNode(MyLinkedListItem <T> item, MyLinkedListItem <T> prev)
{
try
{
item.Prev = prev;
}
catch (NullReferenceException)
{
}
}
private void SetNextNodeOrRoot(MyLinkedListItem <T> item, MyLinkedListItem <T> next)
{
try
{
item.Next = next;
}
catch (NullReferenceException)
{
this._root = next;
}
}
public void Add(T item)
{
try
{
var last = this.GetLast();
var newItem = new MyLinkedListItem <T>(item);
this.SetNextNodeOrRoot(last, newItem);
this.SetPrevNode(newItem, last);
}
catch (NullReferenceException)
{
this.SetRoot(new MyLinkedListItem <T>(item));
}
}
public void AddAfter(T existing, T newElement)
{
try
{
var existingItem = this.Find(existing);
var nextItem = existingItem.Next;
var newItem = new MyLinkedListItem <T>(newElement);
this.SetNextNodeOrRoot(newItem, nextItem);
this.SetPrevNode(newItem, existingItem);
this.SetNextNodeOrRoot(existingItem, newItem);
this.SetPrevNode(nextItem, newItem);
}
catch (NullReferenceException)
{
throw new InvalidOperationException();
}
}
private void SetRoot(MyLinkedListItem <T> item)
{
this._root = item;
}
public MyLinkedList()
{
this._root = null;
}
