wpf 配置文件属性 1

 public MainWindow()
        {
            InitializeComponent();
            this.WindowState = Properties.Settings.Default.WindowState;//初始化窗体状态  Properties：配置文件的命名空间

            Rect rect = Properties.Settings.Default.WindowRect; //初始化窗体位置
            this.Top = rect.Top;
            this.Left = rect.Left;
            this.Width = rect.Width;
            this.Height = rect.Height;
        }

        private void Button_Click_1(object sender, RoutedEventArgs e)//显示坐标及大小
        {
            MessageBox.Show(this.RestoreBounds.ToString()); //RestoreBounds窗体坐标及大小
        }

        private void Window_Closing_1(object sender, System.ComponentModel.CancelEventArgs e)//窗体关闭前触发
        {
            Properties.Settings.Default.WindowState = this.WindowState;//初始化窗体状态

            Properties.Settings.Default.WindowRect = this.RestoreBounds;
            Properties.Settings.Default.Save();
            //e.Cancel = true;//不能点击关闭按钮
            //隐藏之后f便不为空了，所以点击主窗体的时候小窗体已经弹出来了，但是只是隐藏了还没有关闭，所有要关闭它
            if (f != null)
            {
                f.Close();
            }
        }
        Window1 f;
        private void Button_Click_2(object sender, RoutedEventArgs e)
        {   
            //加if条件是为了保证唯一实例化
            if (f == null)
            {
                f = new Window1();
                f.Show();
            }
            else
            {
                f.Show();
            }

        }

        private void Button_Click_3(object sender, RoutedEventArgs e)
        {
            //加if条件是为了保证唯一实例化,杜绝资源的浪费
            if (f != null)
            {
                f.Hide();
            }
            else
            {
                MessageBox.Show("请先打开窗口再执行隐藏"); 
            }
        }