/*15.6
(文件瀏覽器)以圖15.14、圖15.28 和圖15.31中的程序為基礎，創建一個( 類似於Windows Explorer 的文件瀏覽器。這個文件瀏覽器應具有TreeView,它使用戶能夠瀏覽文件夾。還應具有List-View,它用於顯示所瀏覽文件夾的內容( 全部子文件夾和文件)。在ListView 中雙擊文件應能打開它; 在ListView或TreeView 中雙擊文件夾應能瀏覽它。如果由於權限設置使文件或文件夾無法訪問，則應通知用戶。
*/
using System;
using System.Drawing;
using System.Windows.Forms;
using System.IO;
namespace Explorer
{
public partial class ExplorerForm : Form
{
private string directory;
public ExplorerForm()
{
InitializeComponent();
}
public void PopulateTreeView(
string directoryValue, TreeNode parentNode )
{
string[] directoryArray =
Directory.GetDirectories( directoryValue );
try
{
if ( directoryArray.Length != 0 )
{
foreach ( var directory in directoryArray )
{
TreeNode myNode = new TreeNode( directory );
parentNode.Nodes.Add( myNode );
PopulateTreeView( directory, myNode );
}
}
}
catch ( UnauthorizedAccessException )
{
parentNode.Nodes.Add( "Access denied" );
}
}
private void ExplorerForm_Load( object sender, EventArgs e )
{
Image folderImage = Properties.Resources.folder;
Image fileImage = Properties.Resources.file;
fileFolder.Images.Add( folderImage );
fileFolder.Images.Add( fileImage );
directoryTreeView.Nodes.Add( "C:" );
PopulateTreeView( @"C:\", directoryTreeView.Nodes[0] );
}
private void directoryTreeView_AfterSelect(
object sender, TreeViewEventArgs e )
{
TreeNode tempNode = directoryTreeView.SelectedNode;
if ( directoryTreeView.SelectedNode.Text == "C:" )
directory = directoryTreeView.SelectedNode.Text + @"\";
else
directory = directoryTreeView.SelectedNode.Text;
LoadFilesInDirectory( directory );
}
public void LoadFilesInDirectory( string currentDirectory )
{
DirectoryInfo DIcurrent;
DirectoryInfo[] DIArray;
FileInfo[] FIArray;
ListViewItem newDirectoryItem;
ListViewItem newFileItem;
try
{
browserListView.Items.Clear();
directory = currentDirectory;
DIcurrent = new DirectoryInfo( directory );
DIArray = DIcurrent.GetDirectories();
FIArray = DIcurrent.GetFiles();
foreach ( var directoryInformation in DIArray )
{
newDirectoryItem = browserListView.Items.Add(
directoryInformation.Name );
newDirectoryItem.ImageIndex = 0;
}
foreach ( var fileInformation in FIArray )
{
newFileItem =
browserListView.Items.Add( fileInformation.Name );
newFileItem.ImageIndex = 1;
}
}
catch ( UnauthorizedAccessException )
{
MessageBox.Show( "Warning: Some files may not be " +
"visible due to permission settings", "Attention",
MessageBoxButtons.OK, MessageBoxIcon.Warning );
}
}
private void browserListView_DoubleClick(
object sender, EventArgs e )
{
string chosen;
if ( browserListView.SelectedItems.Count != 0 )
{
chosen = browserListView.SelectedItems[0].Text;
System.Diagnostics.Process.Start( directory + "\\" +
browserListView.SelectedItems[0].Text );
}
}
}
}

C#大學課程(第五版)課後習題15.6文件瀏覽器