Add sample for using Folder Browser with multiselect

Co-authored-by: "C. Augusto Proiete" <[email protected]>

Author: dlozoya

sample/Ookii.Dialogs.Wpf.Sample/MainWindow.xaml

@@ -16,6 +16,7 @@
                 <ComboBoxItem>Progress Dialog</ComboBoxItem>
                 <ComboBoxItem>Credential Dialog</ComboBoxItem>
                 <ComboBoxItem>Vista-style Folder Browser Dialog</ComboBoxItem>
+                <ComboBoxItem>Vista-style Folder Browser Dialog (Select Multiple)</ComboBoxItem>
                 <ComboBoxItem>Vista-style Open File Dialog</ComboBoxItem>
                 <ComboBoxItem>Vista-style Save File Dialog</ComboBoxItem>
             </ComboBox.Items>

sample/Ookii.Dialogs.Wpf.Sample/MainWindow.xaml.cs

@@ -60,9 +60,12 @@ private void _showDialogButton_Click(object sender, RoutedEventArgs e)
                 ShowFolderBrowserDialog();
                 break;
             case 5:
-                ShowOpenFileDialog();
+                ShowFolderBrowserDialogSelectMultiple();
                 break;
             case 6:
+                ShowOpenFileDialog();
+                break;
+            case 7:
                 ShowSaveFileDialog();
                 break;
             }
@@ -162,13 +165,46 @@ private void ShowCredentialDialog()
 
         private void ShowFolderBrowserDialog()
         {
-            VistaFolderBrowserDialog dialog = new VistaFolderBrowserDialog();
+            var dialog = new VistaFolderBrowserDialog();
             dialog.Description = "Please select a folder.";
             dialog.UseDescriptionForTitle = true; // This applies to the Vista style dialog only, not the old dialog.
-            if( !VistaFolderBrowserDialog.IsVistaFolderDialogSupported )
+
+            if (!VistaFolderBrowserDialog.IsVistaFolderDialogSupported)
+            {
                 MessageBox.Show(this, "Because you are not using Windows Vista or later, the regular folder browser dialog will be used. Please use Windows Vista to see the new dialog.", "Sample folder browser dialog");
-            if( (bool)dialog.ShowDialog(this) )
-                MessageBox.Show(this, "The selected folder was: " + dialog.SelectedPath, "Sample folder browser dialog");            
+            }
+
+            if ((bool)dialog.ShowDialog(this))
+            {
+                MessageBox.Show(this, $"The selected folder was:{Environment.NewLine}{dialog.SelectedPath}", "Sample folder browser dialog");
+            }
+        }
+
+        private void ShowFolderBrowserDialogSelectMultiple()
+        {
+            var dialog = new VistaFolderBrowserDialog();
+            dialog.Multiselect = true;
+            dialog.Description = "Please select a folder.";
+            dialog.UseDescriptionForTitle = true; // This applies to the Vista style dialog only, not the old dialog.
+
+            if (!VistaFolderBrowserDialog.IsVistaFolderDialogSupported)
+            {
+                MessageBox.Show(this, "Because you are not using Windows Vista or later, the regular folder browser dialog will be used. Please use Windows Vista to see the new dialog.", "Sample folder browser dialog");
+            }
+
+            if ((bool)dialog.ShowDialog(this))
+            {
+                var selectedPaths = dialog.SelectedPaths;
+
+                if (selectedPaths.Length == 1)
+                {
+                    MessageBox.Show(this, $"The selected folder was:{Environment.NewLine}{selectedPaths[0]}", "Sample folder browser dialog");
+                }
+                else
+                {
+                    MessageBox.Show(this, $"The selected folders were:{Environment.NewLine}{string.Join(Environment.NewLine, selectedPaths)}", "Sample folder browser dialog");
+                }
+            }
         }
 
         private void ShowOpenFileDialog()