internal void GenerateNewListOfNodesFromTreeViewControl(TreeNode CurrentNode, ref int nodeCount,
ref List <Topic> generatedList) // the 2 ref parameters must be passed for recursion
{
// visits all the childrens of CurrentNode in the Treeview.
// with the Modified Tree Traversal algorithm
// add a new element for the List that we will save to the database
Topic ct = ((Topic)CurrentNode.Tag);
ct.LeftNodeNew = nodeCount++;
// manages left node number
generatedList.Add((Topic)CurrentNode.Tag);
if (ct.Id == null || ct.Id == 0)
{
// if CurrentNode is a new node, then we create it in the database,
// so that it will have its Id. It will be saved with correct data
// in the following because new and old values will differ
ct.Id = db.CreateNewTopic(ct);
}
int brotherNo = 1;
foreach (TreeNode sonNode in CurrentNode.Nodes)
{
// calls passing the updated count and the list under construction
GenerateNewListOfNodesFromTreeViewControl(sonNode, ref nodeCount, ref generatedList);
((Topic)sonNode.Tag).ParentNodeNew = ct.Id;
((Topic)sonNode.Tag).ChildNumberNew = brotherNo++;
}
// If brothers are finished saves data of itself and returns.
// right node management
((Topic)CurrentNode.Tag).RightNodeNew = nodeCount++;
}