在窗体中加入一个TreeView、RichTextBox、TextBox，布局随便调整吧，双击TreeView加入AfterSelect事件。

用如下代码相应替代，一个简单的资源管理器就有了。

 

using System; 
using System.Collections.Generic; 
using System.ComponentModel; 
using System.Data; 
using System.Drawing; 
using System.Text; 
using System.Windows.Forms; 
using System.IO; 
 

 

namespace MyExplore 
{ 
    /// <summary> 
    /// Description of Form1. 
    /// </summary> 
    public partial class Form1 : Form 
    { 
 
        TreeNode rootnode = new TreeNode(); 
        string str = ""; 
 
        public Form1() 
        { 
            InitializeComponent(); 
            rootnode.Text = ""; 
 
            //获得整个系统磁盘驱动 
            DriveInfo[] drivers = DriveInfo.GetDrives(); 
 
            //将盘符名加载到TreeView的顶级节点 
            foreach (DriveInfo driver in drivers) 
            { 
                TreeNode treenode = new TreeNode(); 
                treenode.Text = driver.Name; 
                rootnode.Nodes.Add( treenode); 
            } 
 
            rootnode.Text = "System"; 
            this.treeView1.Nodes.Add(rootnode); 
        } 
 
        void TreeView1AfterSelect(object sender, TreeViewEventArgs e) 
        { 
            if( e.Node.Text != "System") 
            { 
                str = e.Node.FullPath.Replace(@"System",string.Empty).Replace(@"\\",@"\"); 
                this.textBox1.Text = str; 

                DirectoryInfo directoryInfo = new DirectoryInfo(str); 
                try 
                { 
                   foreach (DirectoryInfo childDirectoryInfo in directoryInfo.GetDirectories()) 
                   { 
                     TreeNode directoryNode = new TreeNode(childDirectoryInfo.Name.ToString()); 
                     directoryNode.Tag = childDirectoryInfo.Name.ToString(); 
                     e.Node.Nodes.Add(directoryNode); 
                  } 
                  this.treeView1.Refresh(); 
                } 
                catch ( System.IO.DirectoryNotFoundException ee ) 
                { 
                   this.textBox1.Text = ee.ToString(); 
                } 
          

                try { 
                    StringBuilder sb = new StringBuilder(); 
                    DirectoryInfo directoryInfo1 = new DirectoryInfo(str); 
                    foreach (FileInfo fileInfo in directoryInfo1.GetFiles("*.*")) 
                    { 
                       sb.AppendLine(fileInfo.Name); 
                    } 
                    this.richTextBox1.Text = sb.ToString(); 
               } 
               catch( System.IO.FileNotFoundException ee ) 
               { 
                   this.textBox1.Text = ee.ToString(); 
               } 
         } 
       } 
     } 
}