TreeView 递归列出电脑所有盘符

 private void FormTreeView_Load(object sender, EventArgs e)
        {
            FilltvwDirectory();
        }

        private void FilltvwDirectory()
        {
            //获取当前设备盘符，并添加到数组dires[i]里面
            string[] dires = Environment.GetLogicalDrives();

            int diresLength = dires.Length;
            for (int i = 0; i < diresLength; i++)
            {
                TreeNode cRoot = new TreeNode(dires[i]);
                tvwDirectory.Nodes.Add(cRoot);
                AddDirectories(cRoot);
            }
        }

        private void AddDirectories(TreeNode node)
        {
            try
            {
                //获取当前节点路径
                DirectoryInfo dir = new DirectoryInfo(GetPathFromNode(node));
                DirectoryInfo[] e = dir.GetDirectories();
                int eLength = e.Length;
                for (int i = 0; i < eLength; i++)
                {
                    string name = e[i].Name;
                    //判断是否是上级目录
                    if (!name.Equals(".") && !name.Equals(".."))
                    {
                        node.Nodes.Add(name);
                    }
                }
            }
            catch (Exception e)
            {
                // MessageBox.Show(e.Message);
            }
        }

        private string GetPathFromNode(TreeNode node)
        {
            if (node.Parent == null)
            {
                return node.Text;
            }

            //递归调用产生节点对应文件夹的路径
            //Path.Combine组合产生路径，如Path.Combine("A","B")则生成"A\\B"
            return Path.Combine(GetPathFromNode(node.Parent), node.Text);
        }

        private void AddSubDirectories(TreeNode node)
        {
            int nodesCount = node.Nodes.Count;
            for (int i = 0; i < nodesCount; i++)
            {
                AddDirectories(node.Nodes[i]);
            }
        }
        //在将要展开节点时发生
        private void tvwDirectory_BeforeExpand(object sender, TreeViewCancelEventArgs e)
        {
            TreeNode nodeExpanding = (TreeNode)e.Node;
            AddSubDirectories(nodeExpanding);
        }