添加项目文件。

App.xaml

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+<Application
+    x:Class="MicaApps.Upw.Mail.App"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="using:MicaApps.Upw.Mail">
+
+</Application>

App.xaml.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Runtime.InteropServices.WindowsRuntime;
+using Windows.ApplicationModel;
+using Windows.ApplicationModel.Activation;
+using Windows.Foundation;
+using Windows.Foundation.Collections;
+using Windows.UI.Xaml;
+using Windows.UI.Xaml.Controls;
+using Windows.UI.Xaml.Controls.Primitives;
+using Windows.UI.Xaml.Data;
+using Windows.UI.Xaml.Input;
+using Windows.UI.Xaml.Media;
+using Windows.UI.Xaml.Navigation;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace MicaApps.Upw.Mail
+{
+    /// <summary>
+    /// 提供特定于应用程序的行为，以补充默认的应用程序类。
+    /// </summary>
+    sealed partial class App : Application
+    {
+        /// <summary>
+        /// 注入依赖
+        /// </summary>
+        public static IServiceProvider Services { get; private set; } = new ServiceCollection()
+            .AddSingleton<Services.LoginStatus>()
+            .BuildServiceProvider();
+
+
+
+        /// <summary>
+        /// 初始化单一实例应用程序对象。这是执行的创作代码的第一行，
+        /// 已执行，逻辑上等同于 main() 或 WinMain()。
+        /// </summary>
+        public App()
+        {
+            this.InitializeComponent();
+            this.Suspending += OnSuspending;
+        }
+
+
+        /// <summary>
+        /// 在应用程序由最终用户正常启动时进行调用。
+        /// 将在启动应用程序以打开特定文件等情况下使用。
+        /// </summary>
+        /// <param name="e">有关启动请求和过程的详细信息。</param>
+        protected override void OnLaunched(LaunchActivatedEventArgs e)
+        {
+            Frame rootFrame = Window.Current.Content as Frame;
+
+            // 不要在窗口已包含内容时重复应用程序初始化，
+            // 只需确保窗口处于活动状态
+            if (rootFrame == null)
+            {
+                // 创建要充当导航上下文的框架，并导航到第一页
+                rootFrame = new Frame();
+
+                rootFrame.NavigationFailed += OnNavigationFailed;
+
+                if (e.PreviousExecutionState == ApplicationExecutionState.Terminated)
+                {
+                    //TODO: 从之前挂起的应用程序加载状态
+                }
+
+                // 将框架放在当前窗口中
+                Window.Current.Content = rootFrame;
+            }
+
+            if (e.PrelaunchActivated == false)
+            {
+                if (rootFrame.Content == null)
+                {
+                    // 当导航堆栈尚未还原时，导航到第一页，
+                    // 并通过将所需信息作为导航参数传入来配置
+                    // 参数
+                    rootFrame.Navigate(typeof(MainPage), e.Arguments);
+                }
+                // 确保当前窗口处于活动状态
+                Window.Current.Activate();
+            }
+        }
+
+        /// <summary>
+        /// 导航到特定页失败时调用
+        /// </summary>
+        ///<param name="sender">导航失败的框架</param>
+        ///<param name="e">有关导航失败的详细信息</param>
+        void OnNavigationFailed(object sender, NavigationFailedEventArgs e)
+        {
+            throw new Exception("Failed to load Page " + e.SourcePageType.FullName);
+        }
+
+        /// <summary>
+        /// 在将要挂起应用程序执行时调用。  在不知道应用程序
+        /// 无需知道应用程序会被终止还是会恢复，
+        /// 并让内存内容保持不变。
+        /// </summary>
+        /// <param name="sender">挂起的请求的源。</param>
+        /// <param name="e">有关挂起请求的详细信息。</param>
+        private void OnSuspending(object sender, SuspendingEventArgs e)
+        {
+            var deferral = e.SuspendingOperation.GetDeferral();
+            //TODO: 保存应用程序状态并停止任何后台活动
+            deferral.Complete();
+        }
+    }
+}

Controls/LoginButton.xaml

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+<Button
+    x:Class="MicaApps.Upw.Mail.Controls.LoginButton"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="using:MicaApps.Upw.Mail.Controls"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    Background="White"
+    mc:Ignorable="d">
+    <Grid>
+        <Grid.ColumnDefinitions>
+            <ColumnDefinition Width="50"/>
+            <ColumnDefinition Width="*"/>
+            <ColumnDefinition Width="50"/>
+        </Grid.ColumnDefinitions>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="*"/>
+        </Grid.RowDefinitions>
+        <!-- Left Icon -->
+        <Image Grid.Column="0" x:Name="LeftIcon" VerticalAlignment="Center" HorizontalAlignment="Center" Margin="5"/>
+        <!-- Right Icon -->
+        <Image Grid.Column="2" x:Name="RightIcon" VerticalAlignment="Center" HorizontalAlignment="Center" Margin="5"/>
+        <!-- Content Grid -->
+        <Grid Grid.Column="1" MinWidth="200">
+            <Grid.RowDefinitions>
+                <RowDefinition Height="3*"/>
+                <RowDefinition Height="2*"/>
+            </Grid.RowDefinitions>
+            <Grid.ColumnDefinitions>
+                <ColumnDefinition Width="*"/>
+            </Grid.ColumnDefinitions>
+            <!-- Title -->
+            <TextBlock Grid.Row="0" FontSize="20" x:Name="textblock_title" HorizontalAlignment="Left" VerticalAlignment="Center"/>
+            <!-- Subtitle -->
+            <TextBlock Grid.Row="1" FontSize="12" x:Name="textblock_subTitle"  HorizontalAlignment="Left" VerticalAlignment="Center"/>
+        </Grid>
+    </Grid>
+</Button>

Controls/LoginButton.xaml.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Runtime.InteropServices.WindowsRuntime;
+using Windows.Foundation;
+using Windows.Foundation.Collections;
+using Windows.UI.Xaml;
+using Windows.UI.Xaml.Controls;
+using Windows.UI.Xaml.Controls.Primitives;
+using Windows.UI.Xaml.Data;
+using Windows.UI.Xaml.Input;
+using Windows.UI.Xaml.Media;
+using Windows.UI.Xaml.Navigation;
+
+//https://go.microsoft.com/fwlink/?LinkId=234236 上介绍了“用户控件”项模板
+
+namespace MicaApps.Upw.Mail.Controls
+{
+    public sealed partial class LoginButton : Button
+    {
+        public LoginButton()
+        {
+            this.InitializeComponent();
+        }
+
+        /// <summary>
+        /// 主标题
+        /// </summary>
+        public string title { set=>this.textblock_title.Text = value; }
+        /// <summary>
+        /// 副标题
+        /// </summary>
+        public string subTitle { set => this.textblock_subTitle.Text = value; }
+
+
+
+    }
+}

MainPage.xaml

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+<Page
+    x:Class="MicaApps.Upw.Mail.MainPage"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="using:MicaApps.Upw.Mail"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    mc:Ignorable="d"
+    Loaded="Page_Loaded"
+    Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
+
+    <Grid>
+        <Frame x:Name="frame_main" />
+    </Grid>
+</Page>

MainPage.xaml.cs

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+using Microsoft.Extensions.DependencyInjection;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Runtime.InteropServices.WindowsRuntime;
+using System.Threading.Tasks;
+using Windows.Foundation;
+using Windows.Foundation.Collections;
+using Windows.UI.Xaml;
+using Windows.UI.Xaml.Controls;
+using Windows.UI.Xaml.Controls.Primitives;
+using Windows.UI.Xaml.Data;
+using Windows.UI.Xaml.Input;
+using Windows.UI.Xaml.Media;
+using Windows.UI.Xaml.Navigation;
+
+// https://go.microsoft.com/fwlink/?LinkId=402352&clcid=0x804 上介绍了“空白页”项模板
+
+namespace MicaApps.Upw.Mail
+{
+    /// <summary>
+    /// 可用于自身或导航至 Frame 内部的空白页。
+    /// </summary>
+    public sealed partial class MainPage : Page
+    {
+        public MainPage()
+        {
+            this.InitializeComponent();
+
+        }
+
+
+
+        private void Page_Loaded(object sender, RoutedEventArgs e)
+        {
+            this.frame_main.Navigate(typeof(Pages.LoginPage));
+        }
+    }
+}