Question

For example, there are .Name, .Text fields. What if I need Type, Path and Direction fields, how can I add them to class TreeNode ?

Answer 1

Does this satisfy what you intended? I’ve shown these as properties, but omit the {get;set;} and you’ll have fields.

  class myTreeNode : System.Windows.Forms.TreeNode
  {
    public string NodeType { get; set; }
    public string NodePath { get; set; }
    public string Direction { get; set; }
  }

To add myTreeNode instances to a TreeView, you’d do this:

myTreeNode node = new myTreeNode();  
treeview1.Nodes.Add(node);

If you want to use the Tag property instead of storing these directly in an inherited node, (showing just two properties instead of 3)

class NodeTag
{  
  public NodeTag(string path, string direction)
  {
     NodePath = path;
     Direction = direction;
  }
  public string Direction {get;set;}
}

Then, in your code that creates the tree, you’ll do this:

TreeNode node = new TreeNode();
node.Tag = new NodeTag("my path", "South");
treeView1.Nodes.Add(node);