// 把子目录和文件添加到文件列表视图中             lvFiles.BeginUpdate();             lvFiles.Clear();    // 首先清除列表视图中的所有内容             // 添加4个列表头             lvFiles.Columns.AddRange(                 new System.Windows.Forms.ColumnHeader[] {                         chName,                         chSize,                         chType,                         chTime});             // 首先把子目录添加到列表视图中             for( int i=0;i<dirs.Length;i++)             {                 items[0] = Path.GetFileName(dirs[i]);                 items[1] = "";                 items[2] = "文件夹";                 items[3] = Directory.GetLastWriteTime(dirs[i]). ToLong DateString() + " " +Directory.GetLastWriteTime(dirs[i]). ToLongTimeString();                 lvi = new ListViewItem(items,3);                 lvFiles.Items.Add(lvi);             }             // 然后再把文件添加到列表视图中             for( int i=0;i<files.Length;i++)             {                 string ext = (Path.GetExtension( files[i] )).ToLower();                     // 根据不同的扩展名，来设定列表项的图标                 if( ext == ".txt")                 {                     nImgIndex = 5;                 }                 else if( ext == ".bmp")                 {                     nImgIndex = 6;                 }                 else if( ext == ".hlp")                 {                     nImgIndex = 7;                 }                 else if( ext == ".exe")                 {                     nImgIndex = 8;                 }                 else                 {                     nImgIndex = 9;                 }                   items[0] = Path.GetFileName(files[i]);                 FileInfo fi = new FileInfo( files[i] );                 items[1] = fi.Length.ToString();                 items[2] = ext + "文件";                 items[3] = fi.LastWriteTime.ToLongDateString() + "  " +                             fi.LastWriteTime.ToLongTimeString();                   lvi = new ListViewItem( items,nImgIndex );                 lvFiles.Items.Add( lvi );                               }             lvFiles.EndUpdate();         }   // <summary>         // 打开列表视图中当前选择的文件         // </summary>         private void OpenFile()         {             if( lvFiles.SelectedItems.Count <=0 )             { MessageBox.Show(this,"请先选择要打开的文件！","打开文件",MessageBoxButtons.OK,MessageBoxIcon.Exclamation);                 return;             }             ListViewItem lvi = lvFiles.SelectedItems[0];               if( (Path.GetExtension( lvi.Text )).ToLower() != ".txt" )             { MessageBox.Show(this,"只能打开文本文件！","打开文件错误",MessageBoxButtons.OK,MessageBoxIcon.Exclamation);                 return;             }                         ContentForm fileForm = new ContentForm();             fileForm.Text = "查看文件内容-" + lvi.Text; string filename = tvDir.SelectedNode.FullPath + "\\" + lvFiles.SelectedItems[0].Text;             StreamReader sr = new StreamReader( filename );             ArrayList lines = new ArrayList();             // 从文件中读取内容并把它们赋给显示文件内容对象框中的             // txtContent文本框。             while( sr.Peek() != -1 )             {                 lines.Add( sr.ReadLine() ); // 一次读取一行数据             } fileForm.txtContent.Lines = (string[])lines.ToArray(Type. GetType("System.String"));             sr.Close();             fileForm.txtContent.Select(0,0);             fileForm.ShowDialog(this);  // 显示对话框         }           // <summary>         // 在当前选择的目录中创建一个新的文本文件         // </summary>         private void NewFile()         {             InputFileName formFileName = new InputFileName();             if( formFileName.ShowDialog(this) == DialogResult.OK )             {                 string filename = tvDir.SelectedNode.FullPath +                     "\\" + formFileName.txtFileName.Text + ".txt";                 StreamWriter sw = new StreamWriter( filename );                 if( sw != null )                 {                     // 创建新文件后，向其中写入测试内容 sw.Write("新创建的文本文件\n演示基本的文件输入/输出操作");                     sw.Close();                     ListDirsAndFiles( tvDir.SelectedNode.FullPath );                 }             }           }           // <summary>         // 删除当前选择的文件         // </summary>         private void DeleteFile()         {             if( lvFiles.SelectedItems.Count <=0 )             { MessageBox.Show(this,"请先选择要删除的文件！","删除文件",MessageBoxButtons.OK,MessageBoxIcon.Exclamation);                 return;             }             string filename = tvDir.SelectedNode.FullPath +                     "\\" + lvFiles.SelectedItems[0].Text;             if( lvFiles.SelectedItems[0].ImageIndex == 3 )             { MessageBox.Show(this,"当前所选择的是目录，不是文件，不能进行删除！","删除文件",MessageBoxButtons.OK,MessageBoxIcon. Exclamation);                 return;             }             else                    File.Delete( filename );             ListDirsAndFiles( tvDir.SelectedNode.FullPath );         }           // <summary>         // 在当前选择的目录中创建一个新的子目录         // </summary>         private void NewDirectory()         {             InputFileName formDir = new InputFileName();             formDir.Text = "输入目录名称";             formDir.label1.Text = "请输入新目录的名称：";             if( formDir.ShowDialog(this) == DialogResult.OK )             {                 Directory.CreateDirectory( tvDir.SelectedNode.FullPath +                     "\\" + formDir.txtFileName.Text );

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