<Page.BottomAppBar>
        <AppBar>
            <Grid>
                <Button x:Name="Save" Style="{StaticResource SaveAppBarButtonStyle}" AutomationProperties.Name="保存课表"
                        HorizontalAlignment="Center" Click="Save_Click"/>
            </Grid>        
        </AppBar>
    </Page.BottomAppBar>
    <Page.TopAppBar>
        <AppBar>
            <Grid>
                <Button x:Name="About" Style="{StaticResource HelpAppBarButtonStyle}" AutomationProperties.Name="关于我们"
                        HorizontalAlignment="Center" Click="AboutClick"/>
            </Grid>
        </AppBar>
    </Page.TopAppBar>
</Page>

        private void AboutClick(object sender, RoutedEventArgs e)
        {
            this.Frame.Navigate(typeof(AboutPage));
        }

<Grid Background="{StaticResource AppBackgroundColor}">
        <StackPanel HorizontalAlignment="Center" VerticalAlignment="Center">
            <Grid>
                <Grid.RowDefinitions>
                    <RowDefinition Height="*" />
                    <RowDefinition Height="*" />
                    <RowDefinition Height="*" />
                </Grid.RowDefinitions>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="300"/>
                    <ColumnDefinition Width="*"/>
                </Grid.ColumnDefinitions>
                <TextBlock FontSize="42" TextWrapping="Wrap" Grid.RowSpan="2" Grid.Column="0" Grid.Row="0">
                    此教程由fengyun1989创作，仅供学习交流使用请勿用于商业用途。
                </TextBlock>
                <Image Source="/Assets/120.jpg" Grid.Column="1" Grid.RowSpan="2" Grid.Row="0" Height="200" Width="200"/>
                <Button Content="确定" Width="200" Height="60" HorizontalAlignment="Center" Grid.Row="2" Grid.ColumnSpan="2"
                        Grid.Column="0" Click="Button_Click_1"/>
            </Grid>
        </StackPanel>
    </Grid>

        private void Button_Click_1(object sender, RoutedEventArgs e)
        {
            this.Frame.Navigate(typeof(MainPage));
        }

private async void Save_Click(object sender, RoutedEventArgs e)
        {
            FileSavePicker openPicker = new FileSavePicker();
            openPicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
            openPicker.FileTypeChoices.Add("XML", new List<string>() { ".xml" });
            openPicker.FileTypeChoices.Add("TEXT", new List<string>() { ".txt" });
            openPicker.DefaultFileExtension = ".xml";
            openPicker.SuggestedFileName = "kebiao";
            openPicker.SuggestedStartLocation = PickerLocationId.DocumentsLibrary;
            StorageFile file = await openPicker.PickSaveFileAsync();
            if (file != null)
            {
                // Application now has read/write access to the picked file
                // Prevent updates to the remote version of the file until we finish making changes and call CompleteUpdatesAsync.
                CachedFileManager.DeferUpdates(file);
                // write to file
                await FileIO.WriteTextAsync(file, ConvertViewModel());
                // Let Windows know that we're finished changing the file so the other app can update the remote version of the file.
                // Completing updates may require Windows to ask for user input.
                FileUpdateStatus status = await CachedFileManager.CompleteUpdatesAsync(file);
                if (status == FileUpdateStatus.Complete)
                {
                    MessageDialog msgDlg = new MessageDialog("保存成功！");
                    await msgDlg.ShowAsync();
                }
            }
        }

        /// <summary>
        /// Convert ViewModel to XML string
        /// </summary>
        /// <returns></returns>
        string ConvertViewModel()
        {
            XDocument xml = new XDocument();
            XElement root = new XElement("root");
            foreach (var item in viewModel.WeekdayList)
            {
                XElement weekday = new XElement(item.Weekday);
                foreach (var scheduleItem in item.ScheduleList)
                {
                    XElement lessonName = new XElement(scheduleItem.LessonName);
                    lessonName.SetAttributeValue("clas-s-room", scheduleItem.ClassRoom);
                    lessonName.SetAttributeValue("starttime", scheduleItem.StartTime);
                    lessonName.SetAttributeValue("endtime", scheduleItem.EndTime);
                    weekday.Add(lessonName);
                }
                root.Add(weekday);
            }
            xml.Add(root);
            return xml.ToString();
        }

    <Grid Background="{StaticResource AppBackgroundColor}">
        <TextBlock Text="fengyun1989欢迎您！" FontSize="72" HorizontalAlignment="Center" 
                   VerticalAlignment="Center" x:Name="welcomeText">
            <TextBlock.RenderTransform>
                <RotateTransform />
            </TextBlock.RenderTransform>
        </TextBlock>
    </Grid>

        public SplashPage()
        {
            this.InitializeComponent();
            RotateTransform rotateTransform = welcomeText.RenderTransform as RotateTransform;
            DoubleAnimation anima = new DoubleAnimation();
            anima.From = 0;
            anima.To = 1080;
            anima.Duration = new Duration(TimeSpan.FromSeconds(2));
            Storyboard.SetTarget(anima, rotateTransform);
            Storyboard.SetTargetProperty(anima, "Angle");
            Storyboard storyboard = new Storyboard();
            storyboard.Children.Add(anima);
            storyboard.Completed += storyboard_Completed;
            storyboard.Begin();
        }
        void storyboard_Completed(object sender, object e)
        {
            this.Frame.Navigate(typeof(MainPage));
        }

            // Create a Frame to act navigation context and navigate to the first page
            //var rootFrame = new Frame();
            //if (!rootFrame.Navigate(typeof(MainPage)))
            //{
            //    throw new Exception("Failed to create initial page");
            //}

            //// Place the frame in the current Window and ensure that it is active
            //Window.Current.Content = rootFrame;
            if (Window.Current.Content == null)
            {
                Frame frame = new Frame();
                frame.Navigate(typeof(Pages.SplashPage), args.SplashScreen);
                Window.Current.Content = frame;
            }
            Window.Current.Activate();