public void AddBefore(IBaseNode <T> node, T data)
{
IBaseNode <T> newNode = new Node <T>(data);
if (Count != 0)
{
IBaseNode <T> prev = null;
IBaseNode <T> current = Head;
while (current != null)
{
if (current.Equals(node))
{
if (prev == null)
{
newNode.Next = Head;
Head = newNode;
IncrementIndex();
}
else
{
prev.Next = newNode;
newNode.Next = current;
DecrementIndex();
}
}
prev = current;
current = current.Next;
}
}
}
protected bool TreeNodeContains(TreeNode treeNode, IBaseNode obj)
{
IBaseNode tag = treeNode.Tag as IBaseNode;
if (tag != null && tag.Equals(obj))
{
return(true);
}
foreach (TreeNode node in treeNode.Nodes)
{
if (TreeNodeContains(node, obj))
{
return(true);
}
}
return(false);
}