treeview添加节点

        private void tsbAdd_Click(object sender, EventArgs e)
        {
            try
            {
                if (trv.LabelEdit)
                {
                    return;
                }

            TreeNode tn = new TreeNode();
            trv.SelectedNode.Nodes.Add(tn);
            trv.SelectedNode.Expand();
            trv.LabelEdit = true;
            tn.BeginEdit();
               //
            }
            catch (Exception ex)
            {
                StackFrame fr = new StackFrame(true);
                Log.WriteLine(fr.GetMethod().ReflectedType.FullName + "_" + fr.GetMethod().Name, ex.Message, LogLevel.Error);
            }
        }

        private void trv_AfterLabelEdit(object sender, NodeLabelEditEventArgs e)
        {
            try
            {
                if (e.Label == null || e.Label.Trim().Equals(string.Empty))
                {
                    if (e.Node.Level != ROOT_LEVEL && e.Node.Tag == null)
                    {
                        e.Node.Parent.Nodes.Remove(e.Node);
                    }
                    return;
                }
                else
                {
                    if (e.Node.Tag != null && e.Node.Text.Trim().Equals(string.Empty))
                    {
                        e.Node.Parent.Nodes.Remove(e.Node);
                        return;
                    }
                }

               //
            }
            catch (Exception ex)
            {
                StackFrame fr = new StackFrame(true);
                Log.WriteLine(fr.GetMethod().ReflectedType.FullName + "_" + fr.GetMethod().Name, ex.Message, LogLevel.Error);
            }
            finally
            {
                trv.LabelEdit = false;
            }
        }