C# 文件读取(二)

    将我的电脑中的文件夹信息显示到TreeView控件上。 方法很多种，下面这种方法添加了我的文档。

   

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            BindTreeView1();            
        }

        private void BindTreeView1() {
            //添加我的电脑
            TreeNode rootNode = new TreeNode("我的电脑");
            rootNode.Tag = "我的电脑";
            rootNode.Text = "我的电脑";
            this.directoryTree.Nodes.Add(rootNode);

            //我的文档
            string myDocuments = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
            TreeNode DocNode = new TreeNode(myDocuments);
            DocNode.Text = "我的文档";
            DocNode.Tag = "我的文档";
            rootNode.Nodes.Add(DocNode);
            DocNode.Nodes.Add("");

            //循环便利计算机中所以的逻辑驱动器
            foreach (string drive in Environment.GetLogicalDrives())
            {
                DriveInfo dir = new DriveInfo(drive);
                switch (dir.DriveType)
                {
                    case DriveType.Fixed:
                        TreeNode tNode = new TreeNode(dir.Name.Split(':')[0]);
                        tNode.Name = dir.Name;
                        tNode.Tag = tNode.Name;
                        directoryTree.Nodes.Add(tNode);
                        tNode.Nodes.Add("");
                        break;
                }
            }
            rootNode.Expand();
        }

        private void directoryTree_AfterExpand(object sender, TreeViewEventArgs e)
        {
            e.Node.Expand();
        }

        private void directoryTree_BeforeExpand(object sender, TreeViewCancelEventArgs e)
        {
            TreeViewItems.Add(e.Node);
        }
    }

    public static class TreeViewItems {

        public static void Add(TreeNode e) {
        
            if(e.Tag.ToString() != "我的电脑"){

                e.Nodes.Clear();

                TreeNode tNode = e;
                string path = tNode.Name;

                if (e.Tag.ToString() == "我的文档")
                {
                    path = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
                }

               string [] dics=  Directory.GetDirectories(path);
                foreach (string dic in dics)
                {
                    TreeNode subNode = new TreeNode(new DirectoryInfo(dic).Name);
                    subNode.Name = new DirectoryInfo(dic).FullName;
                    subNode.Tag = subNode.Name;
                    tNode.Nodes.Add(subNode);
                    subNode.Nodes.Add("");
                }
            }
        }
    }