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。
 1 public partial class Form1 : Form
 2     {
 3         public Form1()
 4         {
 5             InitializeComponent();
 6         }
 7 
 8         private void Form1_Load(object sender, EventArgs e)
 9         {
10             BindTreeView1();            
11         }
12 
13         private void BindTreeView1() {
14             //添加我的电脑
15             TreeNode rootNode = new TreeNode("我的电脑");
16             rootNode.Tag = "我的电脑";
17             rootNode.Text = "我的电脑";
18             this.directoryTree.Nodes.Add(rootNode);
19 
20             //我的文档
21             string myDocuments = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
22             TreeNode DocNode = new TreeNode(myDocuments);
23             DocNode.Text = "我的文档";
24             DocNode.Tag = "我的文档";
25             rootNode.Nodes.Add(DocNode);
26             DocNode.Nodes.Add("");
27 
28             //循环便利计算机中所以的逻辑驱动器
29             foreach (string drive in Environment.GetLogicalDrives())
30             {
31                 DriveInfo dir = new DriveInfo(drive);
32                 switch (dir.DriveType)
33                 {
34                     case DriveType.Fixed:
35                         TreeNode tNode = new TreeNode(dir.Name.Split(':')[0]);
36                         tNode.Name = dir.Name;
37                         tNode.Tag = tNode.Name;
38                         directoryTree.Nodes.Add(tNode);
39                         tNode.Nodes.Add("");
40                         break;
41                 }
42             }
43             rootNode.Expand();
44         }
45 
46         private void directoryTree_AfterExpand(object sender, TreeViewEventArgs e)
47         {
48             e.Node.Expand();
49         }
50 
51         private void directoryTree_BeforeExpand(object sender, TreeViewCancelEventArgs e)
52         {
53             TreeViewItems.Add(e.Node);
54         }
55     }
56 
57     public static class TreeViewItems {
58 
59         public static void Add(TreeNode e) {
60         
61             if(e.Tag.ToString() != "我的电脑"){
62 
63                 e.Nodes.Clear();
64 
65                 TreeNode tNode = e;
66                 string path = tNode.Name;
67 
68                 if (e.Tag.ToString() == "我的文档")
69                 {
70                     path = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
71                 }
72 
73                string [] dics=  Directory.GetDirectories(path);
74                 foreach (string dic in dics)
75                 {
76                     TreeNode subNode = new TreeNode(new DirectoryInfo(dic).Name);
77                     subNode.Name = new DirectoryInfo(dic).FullName;
78                     subNode.Tag = subNode.Name;
79                     tNode.Nodes.Add(subNode);
80                     subNode.Nodes.Add("");
81                 }
82             }
83         }
84     }
显示文件夹