ApplicationSettingsBase： 关掉WPF 窗口后，再次打开，显示在上次关闭的位置

体验比较好的设计，用户再次打开程序的时候，还原到上次关闭前的位置。

当然了，用户上次设置的颜色，字体等信息，都可以用同样的办法搞定。

  /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        WindowApplicationSettings settings = new WindowApplicationSettings();

        public MainWindow()
        {
            InitializeComponent();
            this.Loaded += new RoutedEventHandler(MainWindow_Loaded);
            this.Closing += new CancelEventHandler(MainWindow_Closing);
        }

        void MainWindow_Closing(object sender, CancelEventArgs e)
        {
            settings.WinText = tb.Text;
            settings.WinLocation = new Point(this.Left, this.Top);
            settings.Save();
        }

        void MainWindow_Loaded(object sender, RoutedEventArgs e)
        {
            settings.Reload();
            tb.Text = settings.WinText;
            this.Left = settings.WinLocation.X;
            this.Top = settings.WinLocation.Y;
        }
    }

    /// <summary>
    /// Helper class used to save the settings in configuration file
    /// </summary>
    public class WindowApplicationSettings : ApplicationSettingsBase
    {
        [UserScopedSettingAttribute()]
        public String WinText
        {
            get { return (String)this["WinText"]; }
            set { this["WinText"] = value; }
        }

        [UserScopedSettingAttribute()]
        [DefaultSettingValueAttribute("0, 0")]
        public Point WinLocation
        {
            get { return (Point)(this["WinLocation"]); }
            set { this["WinLocation"] = value; }
        }

    }