public MainWindow() { InitializeComponent(); MouseLeftButtonDown += (o, args) => { var hwnd = new WindowInteropHelper(this).Handle; ReleaseCapture(); SendMessage(hwnd, WM_NCLBUTTONDOWN, HT_CAPTION, 0); }; fileOP createDir = new fileOP(); createDir.createFileRootDir("CarpNote"); List<string> bookNameList = createDir.traBook(); for (int i = 0; i < bookNameList.Count;i++ ) { TreeViewItem tvi = new TreeViewItem(); tvi.Header=bookNameList[i].ToString(); tv_book_book.Items.Add(tvi); } ConfigXML userInfo = new ConfigXML(); UserName = userInfo.getUserID(); UserPW = userInfo.getUserPW(); }