Open directory dialog

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You can use the built-in FolderBrowserDialog class for this. Don’t mind that it’s in the System.Windows.Forms namespace.

using (var dialog = new System.Windows.Forms.FolderBrowserDialog())
{
    System.Windows.Forms.DialogResult result = dialog.ShowDialog();
}

If you want the window to be modal over some WPF window, see the question How to use a FolderBrowserDialog from a WPF application.

EDIT: If you want something a bit more fancy than the plain, ugly Windows Forms FolderBrowserDialog, there are some alternatives that allow you to use the Vista dialog instead:

  • Third-party libraries, such as Ookii dialogs (.NET 4.5+)

  • The Windows API Code Pack-Shell:

      using Microsoft.WindowsAPICodePack.Dialogs;

  ...

  var dialog = new CommonOpenFileDialog();
  dialog.IsFolderPicker = true;
  CommonFileDialogResult result = dialog.ShowDialog();

    Note that this dialog is not available on operating systems older than Windows Vista, so be sure to check CommonFileDialog.IsPlatformSupported first.

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