如何基于ookii-dialogs-wpf配置多文件夹/文件选择对话框？

Hey there! Let's break down how to handle selecting multiple folders with your current setup.

First, the straight answer: Ookii.Dialogs.WPF's VistaFolderBrowserDialog doesn't support multi-selection natively. That component is built on Windows' Vista-style folder browser, which doesn't include a multi-select feature. But we can work around this using either another tool from the same library or a native WPF dialog trick.

Option 1: Use Ookii's OpenFileDialog to Select Folders #

You can repurpose the library's OpenFileDialog to act as a folder picker with multi-select enabled. Here's how to implement it:

private void Btn_select_multiple_folders_Click(object sender, RoutedEventArgs e)
{
    var dialog = new Ookii.Dialogs.Wpf.OpenFileDialog
    {
        Filter = "Folders|*.none", // Triggers folder-focused display
        CheckFileExists = false,
        CheckPathExists = true,
        Multiselect = true,
        Title = "Select multiple folders to save processed clips",
        FileName = "Select folders" // Ensures the dialog defaults to folder view
    };

    // Enable folder selection mode via the underlying Windows API
    if (dialog is IFileDialog fileDialog)
    {
        fileDialog.GetOptions(out var currentOptions);
        fileDialog.SetOptions(currentOptions | FOS.FOS_PICKFOLDERS);
    }

    if (dialog.ShowDialog(Application.Current.MainWindow).GetValueOrDefault())
    {
        // dialog.FileNames contains all selected folder paths
        foreach (var folderPath in dialog.FileNames)
        {
            // Handle each folder (e.g., update your storage variable)
            // m_SelectedFolders.Add(folderPath);
        }
    }
}

You'll need these COM interface definitions to interact with the Windows file dialog API (add them to your project):

using System.Runtime.InteropServices;

[ComImport]
[Guid("42f85136-db7e-439c-85f1-e4075d135fc8")]
[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
private interface IFileDialog
{
    [PreserveSig]
    int Show(IntPtr parent);
    void SetOptions(FOS fos);
    void GetOptions(out FOS pfos);
    // We only need these two methods for this use case
}

[Flags]
private enum FOS
{
    FOS_PICKFOLDERS = 0x00000020, // Flag to enable folder selection
}

Option 2: Use Native WPF OpenFileDialog (No Extra COM Setup) #

If you prefer to avoid the COM interface setup, you can use WPF's built-in OpenFileDialog and tweak it to select folders:

private void Btn_select_multiple_folders_Click(object sender, RoutedEventArgs e)
{
    var dialog = new Microsoft.Win32.OpenFileDialog
    {
        Multiselect = true,
        Title = "Select multiple folders",
        Filter = "Folders|*.none",
        CheckFileExists = false,
        CheckPathExists = true
    };

    // Use reflection to enable folder selection mode
    typeof(Microsoft.Win32.OpenFileDialog)
        .GetMethod("SetOption", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance)
        .Invoke(dialog, new object[] { 0x20, true });

    if (dialog.ShowDialog() == true)
    {
        foreach (var folderPath in dialog.FileNames)
        {
            // Process each selected folder
        }
    }
}

Key Notes #

• Both approaches work by tricking the file dialog into displaying folders instead of files, while keeping multi-select enabled.
• The returned paths are full folder paths, just like you'd get from VistaFolderBrowserDialog, so your existing processing logic should work seamlessly.

内容的提问来源于stack exchange，提问作者Sirop4ik