Windows 7 公用檔案夾對話方塊

     在Windows 7 中有些我們經常使用的庫（Libraries），例如：音樂庫、文件庫、視頻庫、圖片庫等。還有幾十個系統已知檔案夾（Known Folders），System、Windows、My Music等。本篇將介紹如何通過Windows API Code Pack 在應用程式中調用這些公用檔案夾。

     將Microsoft.WindowsAPICodePack.dll、Microsoft.WindowsAPICodePack.Shell.dll 加入項目中，編寫如下XAML 代碼，兩個<ComboBox> 用來顯示Known Folders 和Libraries 選項。

<Grid>    <Label Content="Know Folders:" Height="30" Width="100" Margin="47,70,356,211" />    <Label Content="Libraries:" Height="30" Width="100" Margin="48,191,355,90" />    <ComboBox x:Name="knowFolders" Width="200" Height="25" Margin="186,70,117,211" />    <ComboBox x:Name="libraries" Width="200" Height="25" Margin="186,190,117,90" />    <Button x:Name="openKF" Click="openKF_Click" Content="Open Dialog"            Height="30" Width="90" Margin="296,126,116,155" />    <Button x:Name="openLB" Click="openLB_Click" Content="Open Dialog"            Height="30" Width="90" Margin="296,250,117,31" /></Grid>

在C# 中加入如下命名空間，Shell 用於支援載入公用檔案夾，Dialogs用於調用檔案夾對話方塊。

using Microsoft.WindowsAPICodePack.Shell;using Microsoft.WindowsAPICodePack.Dialogs;

     接下了編寫一個ComboBox 載入方法填充上面提到的兩個<ComboBox> 內容，通過IKnownFolder 介面擷取所有KnownFolders 類中的系統已知檔案夾。

private void LoadCombox(){    knowFolders.Items.Clear();    foreach (IKnownFolder kf in KnownFolders.All)    {        if (kf != null && kf.CanonicalName != null)        {            knowFolders.Items.Add(kf.CanonicalName);        }    }        if (knowFolders.Items.Count > 0)    {        SortDescription kfSort = new SortDescription();        knowFolders.Items.SortDescriptions.Add(kfSort);        knowFolders.SelectedIndex = 0;    }    libraries.Items.Clear();    libraries.Items.Add("Documents");    libraries.Items.Add("Music");    libraries.Items.Add("Pictures");    libraries.Items.Add("Videos");    libraries.SelectedIndex = 0;}

     Known Foloder “Open Dialog” 按鈕Click 事件，通過CommonOpenFileDialog 類建立對話方塊，將KnowFolder 初始化為ShellContainer。

private void openKF_Click(object sender, RoutedEventArgs e){    CommonOpenFileDialog cfd = new CommonOpenFileDialog();    string kfString = knowFolders.SelectedItem as string;    IKnownFolder kf = KnownFolderHelper.FromCanonicalName(kfString);    cfd.InitialDirectoryShellContainer = kf as ShellContainer;    cfd.ShowDialog();}

Libraries “Open Dialog” 按鈕Click 事件：

private void openLB_Click(object sender, RoutedEventArgs e){    string selection = libraries.SelectedItem as string;    ShellContainer selectedFolder = null;    switch (selection)    {        case "Documents":            selectedFolder = KnownFolders.DocumentsLibrary as ShellContainer;            break;        case "Music":            selectedFolder = KnownFolders.MusicLibrary as ShellContainer;            break;        case "Pictures":            selectedFolder = KnownFolders.PicturesLibrary as ShellContainer;            break;        case "Videos":            selectedFolder = KnownFolders.VideosLibrary as ShellContainer;            break;    }    CommonOpenFileDialog cfd = new CommonOpenFileDialog();    cfd.EnsureReadOnly = true;    cfd.InitialDirectoryShellContainer = selectedFolder;    cfd.ShowDialog();}

編譯測試：

原始碼

CommonFileDialog.zip