FolderBrowseDialog in WPF

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.IO;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;

using WPF_Dialogs; // Dadurch kann direkt auf IDialog und EDialogResult zugegriffen werden
using WPF_Dialogs.Custom_Controls; //Beinhaltet bisher nur den DialogButton

namespace WPF_Dialogs.Dialogs
{
    public partial class FolderBrowseDialog : Window, IDialog
    {
        public new EDialogResult DialogResult { set; get; }
        public string SelectedPath { get; private set; }

        public FolderBrowseDialog()
        {
            InitializeComponent();
            loadFolders();
        }

        private void DialogButton_clicked(object sender, RoutedEventArgs e)
        {
            DialogButton o = (DialogButton)sender;
            this.DialogResult = o.DialogResult;
            if (this.DialogResult == EDialogResult.OK && this.treeViewFolders.SelectedItem != null)
                this.SelectedPath = ((TreeViewItem)this.treeViewFolders.SelectedItem).ToolTip.ToString();
            this.Close();
        }

        /// <summary>
        /// Zeigt den Dialog an. Kann auch so verwendet werden als ob es keinen Rückgabetyp hätte
        /// </summary>
        /// <returns></returns>
        public EDialogResult showDialog()
        {
            this.ShowDialog();
            return this.DialogResult;
        }

        private void loadFolders() //Laden der Ordner beim initialisieren
        {
            string desktop = Environment.GetFolderPath(Environment.SpecialFolder.Desktop); //Liest den Pfad zum Desktop
            treeViewFolders.Items.Add(loadDirectories(desktop));
            ((TreeViewItem)treeViewFolders.Items[0]).IsExpanded = true;
        }

        private TreeViewItem loadDirectories(string path) //lädt alle Dateien vom path (nur dekstop) aus
        {
            TreeViewItem tvi = new TreeViewItem();
            string[] folders = Directory.GetLogicalDrives();
            tvi.Header = path.Remove(0, path.LastIndexOf("\\") + 1);
            tvi.ToolTip = path;
            tvi.Items.Add(createTreeVieItem(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments)));
            for (int i = 0; i < folders.Length; i++) //Ausgeben der verfügbaren laufwerk(e/sbuchstaben)
            {
                try
                {
                    tvi.Items.Add(createTreeVieItem(folders[i]));
                    tvi.Expanded += new RoutedEventHandler(tvi_Expanded);
                }
                catch (Exception e) //The Drive is not ready, bad solution but best now
                { }
            }
            folders = Directory.GetDirectories(path);
            for (int i = 0; i < folders.Length; i++) //ausgeben der Ordner
            {
                tvi.Items.Add(createTreeVieItem(folders[i]));
                tvi.Expanded +=new RoutedEventHandler(tvi_Expanded);
            }

            return tvi;
        }

        private TreeViewItem createTreeVieItem(string path) //hilfsfunktion zum erstellen der treeviewitems
        {
            TreeViewItem tvi = new TreeViewItem();
            string header = path.Remove(0, path.LastIndexOf("\\") + 1);
            if (header == "") //The Path is a Drive (e.g. C\, after removing \ -> "")
            {
                header = path.Remove(path.Length - 1);
            }
            tvi.Header = header;
            tvi.ToolTip = path;
            if (path != "")
            {
                if (Directory.GetDirectories(path).Length > 0)
                    tvi.Items.Add(new TreeViewItem());
            }
            return tvi;
        }

        private void tvi_Expanded(object sender, RoutedEventArgs e) //nachladen der unterordner beim expandieren
        {
            var tvi = e.OriginalSource as TreeViewItem;
            if (tvi.Items.Count <= 1 && tvi.IsExpanded)
            {
                tvi.Items.Clear();
                string[] folders = Directory.GetDirectories(tvi.ToolTip.ToString());
                for (int i = 0; i < folders.Length; i++)
                {
                    try
                    {
                        tvi.Items.Add(createTreeVieItem(folders[i]));
                        tvi.Expanded += new RoutedEventHandler(tvi_Expanded);
                    }
                    catch (Exception ex) //If there are no rights for the folder, bad solution but best now
                    { }
                }
            }
        }
    }
}