Where is TreeView tree data stored in Visual Studio and can the entire tree be serialized?

Question

.NET

Good afternoon, dear .net gurus,
I'm trying to make a two-level list based on TreeView (WinForms). Through the interface of the form designer, you can edit the nodes of the tree, but I could not figure out how to access them programmatically. In addition, after editing in the application form, I would like to save the entire list of nodes to a file (database). Do visual components, and specifically TreeView, have a built-in ability to save the state of an object to external storage, or what method can be used to do this?

Answer 1

Nodes are accessed through Nodes. You can serialize. TreeView does not have a built-in load / save function.
I use these functions for this:

public void SaveTree(TreeView tree, string filename)
        {
            using (Stream file = File.Open(filename, FileMode.Create))
            {
                BinaryFormatter bf = new BinaryFormatter();
                bf.Serialize(file, tree.Nodes.Cast<TreeNode>().ToList());
            }
        }

        public void LoadTree(TreeView tree, string filename)
        {
            using (Stream file = File.Open(filename, FileMode.Open))
            {
                BinaryFormatter bf = new BinaryFormatter();
                IEnumerable<TreeNode> obj = (IEnumerable<TreeNode>)bf.Deserialize(file);
                if (obj==null )
                {
                    obj = new TreeNode[0];
                }
                if (obj.Count()>0)
                {
                    TreeNode[] nodeList = (obj as IEnumerable<TreeNode>).ToArray();
                    tree.Nodes.AddRange(nodeList);
                }
            }
        }