using System;

using System.Drawing;

using System.Collections;

using System.ComponentModel;

using System.Windows.Forms;

using System.Data;

using System.IO ;

using System .Runtime .InteropServices ;

在mainForm_Load事件中添加以下代码，用于在treeView控件中显示目录树：

private void mainForm_Load(object sender, System.EventArgs e)

//获取逻辑驱动器

string[] LogicDrives=System.IO .Directory .GetLogicalDrives();

TreeNode[] cRoot =new TreeNode[LogicDrives.Length];

for (int i=0;i< LogicDrives.Length ;i++)

{

　TreeNode drivesNode=new TreeNode(LogicDrives[i]);

　treeView.Nodes .Add (drivesNode);

　if (LogicDrives[i]!="A:\\" && LogicDrives[i]!="B:\\" )

　　getSubNode(drivesNode,true);

}

}

private void getSubNode(TreeNode PathName,bool isEnd)

{

　if(!isEnd)

　　return; //exit this

　　TreeNode curNode;

　　DirectoryInfo[] subDir;

　　DirectoryInfo curDir=new DirectoryInfo (PathName.FullPath);

　　try

　　{

　　　subDir=curDir.GetDirectories();

　　}

　　catch{}

　　　foreach(DirectoryInfo d in subDir)

　　　{

　　　　curNode=new TreeNode(d.Name);

　　　　PathName.Nodes .Add (curNode);

　　　　getSubNode(curNode,false);

　　　}

}

private void treeView_AfterExpand(object sender, System.Windows.Forms.TreeViewEventArgs e)

{

　try

　{

　　foreach(TreeNode tn in e.Node .Nodes )

　　{

　　　if (!tn.IsExpanded)

　　　　getSubNode(tn,true);

　　　}

　　}

　catch{;}

}

private void treeView_AfterSelect(object sender,System.Windows.Forms.TreeViewEventArgs e)

{

　listView.Items.Clear();

　DirectoryInfo selDir=new DirectoryInfo(e.Node.FullPath );

　DirectoryInfo[] listDir;

　FileInfo[] listFile;

　try

　{

　　listDir=selDir.GetDirectories();

　　listFile=selDir.GetFiles();

　}

　catch{}

　foreach (DirectoryInfo d in listDir)

　　listView.Items .Add (d.Name,6);

　foreach (FileInfo d in listFile)

　　listView.Items .Add (d.Name);

}