C# Migration: Initially migrated C# codebase by Han

src/Calculator/AboutFlyout.xaml

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+<UserControl x:Class="CalculatorApp.AboutFlyout"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:local="using:CalculatorApp.Common"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             mc:Ignorable="d">
+    <UserControl.Transitions>
+        <TransitionCollection>
+            <EdgeUIThemeTransition Edge="Left"/>
+        </TransitionCollection>
+    </UserControl.Transitions>
+    <Grid>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto"/>
+            <RowDefinition Height="Auto"/>
+            <RowDefinition Height="Auto"/>
+        </Grid.RowDefinitions>
+        <Grid.ColumnDefinitions>
+            <ColumnDefinition Width="Auto"/>
+            <ColumnDefinition Width="*"/>
+        </Grid.ColumnDefinitions>
+
+        <TextBlock x:Name="Header"
+                   Grid.Column="1"
+                   Margin="12,10,12,0"
+                   Style="{ThemeResource SubtitleTextBlockStyle}"/>
+        <StackPanel Grid.Row="1"
+                    Grid.ColumnSpan="2"
+                    Margin="0,12,0,0"
+                    Orientation="Vertical">
+            <RichTextBlock x:Name="AboutContentBody"
+                           MaxWidth="292"
+                           Margin="12,0,12,18"
+                           HorizontalAlignment="Left"
+                           Foreground="{ThemeResource SystemControlPageTextBaseHighBrush}"
+                           FontSize="{ThemeResource BodyFontSize}">
+                <Paragraph>
+                    <Run x:Name="AboutFlyoutVersion"/>
+                    <LineBreak/>
+                    <Run x:Name="AboutControlCopyrightRun"/>
+                </Paragraph>
+            </RichTextBlock>
+            <HyperlinkButton x:Name="AboutFlyoutEULA"
+                             Margin="12,0,12,6"
+                             NavigateUri="https://go.microsoft.com/fwlink/?LinkID=529064"
+                             ToolTipService.ToolTip="https://go.microsoft.com/fwlink/?LinkID=529064">
+                <TextBlock x:Uid="AboutFlyoutEULA"
+                           FontSize="{ThemeResource BodyFontSize}"
+                           TextWrapping="Wrap"/>
+            </HyperlinkButton>
+            <HyperlinkButton Margin="12,0,12,6"
+                             NavigateUri="https://go.microsoft.com/fwlink/?LinkID=822631"
+                             ToolTipService.ToolTip="https://go.microsoft.com/fwlink/?LinkID=822631">
+                <TextBlock x:Uid="AboutControlServicesAgreement"
+                           FontSize="{ThemeResource BodyFontSize}"
+                           TextWrapping="Wrap"/>
+            </HyperlinkButton>
+            <HyperlinkButton Margin="12,0,12,6"
+                             NavigateUri="https://go.microsoft.com/fwlink/?LinkID=521839"
+                             ToolTipService.ToolTip="https://go.microsoft.com/fwlink/?LinkID=521839">
+                <TextBlock x:Uid="AboutControlPrivacyStatement"
+                           FontSize="{ThemeResource BodyFontSize}"
+                           TextWrapping="Wrap"/>
+            </HyperlinkButton>
+            <Button x:Name="FeedbackButton"
+                    x:Uid="FeedbackButton"
+                    MinWidth="120"
+                    Margin="12,12,0,0"
+                    HorizontalAlignment="Left"
+                    VerticalAlignment="Top"
+                    Style="{StaticResource ButtonRevealStyle}"
+                    Click="FeedbackButton_Click"/>
+
+        </StackPanel>
+        <RichTextBlock x:Name="AboutFlyoutContribute"
+                       Grid.Row="2"
+                       Grid.ColumnSpan="2"
+                       Margin="12,18,12,6"
+                       HorizontalAlignment="Left"
+                       Foreground="{ThemeResource SystemControlPageTextBaseHighBrush}"
+                       FontSize="{ThemeResource BodyFontSize}"
+                       TextWrapping="Wrap">
+            <Paragraph>
+                <Run x:Name="ContributeRunBeforeLink"/>
+                <Hyperlink NavigateUri="https://go.microsoft.com/fwlink/?linkid=2099939"
+                           TextDecorations="None"
+                           ToolTipService.ToolTip="https://go.microsoft.com/fwlink/?linkid=2099939">
+                    <Run x:Name="ContributeRunLink"/>
+                </Hyperlink>
+                <Run x:Name="ContributeRunAfterLink"/>
+            </Paragraph>
+        </RichTextBlock>
+    </Grid>
+</UserControl>

src/Calculator/AboutFlyout.xaml.cs

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+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+using CalculatorApp.Common;
+using System;
+using System.Diagnostics;
+using Windows.ApplicationModel;
+using Windows.System;
+using Windows.UI.Xaml;
+
+namespace CalculatorApp
+{
+    public sealed partial class AboutFlyout
+    {
+        // CSHARP_MIGRATION: TODO:
+        // BUILD_YEAR was a C++/CX macro and may update the value from the pipeline
+        private const string BUILD_YEAR = "2021";
+
+        public AboutFlyout()
+        {
+            var locService = LocalizationService.GetInstance();
+            var resourceLoader = AppResourceProvider.GetInstance();
+
+            InitializeComponent();
+
+            Language = locService.GetLanguage();
+
+            SetVersionString();
+
+            Header.Text = resourceLoader.GetResourceString("AboutButton/Content");
+
+            var copyrightText =
+                LocalizationStringUtil.GetLocalizedString(resourceLoader.GetResourceString("AboutControlCopyright"), BUILD_YEAR);
+            AboutControlCopyrightRun.Text = copyrightText;
+
+            InitializeContributeTextBlock();
+        }
+
+        public void SetDefaultFocus()
+        {
+            AboutFlyoutEULA.Focus(FocusState.Programmatic);
+        }
+
+        private void FeedbackButton_Click(object sender, RoutedEventArgs e)
+        {
+            PackageVersion version = Package.Current.Id.Version;
+            string versionNumber = "Version ";
+            versionNumber = versionNumber + version.Major + "." + version.Minor + "." + version.Build + "." + version.Revision;
+            _ = Launcher.LaunchUriAsync(new Uri("windows-feedback:?contextid=130&metadata=%7B%22Metadata%22:[%7B%22AppBuild%22:%22" + versionNumber + "%22%7D]%7D"));
+        }
+
+        private void SetVersionString()
+        {
+            PackageVersion version = Package.Current.Id.Version;
+            string appName = AppResourceProvider.GetInstance().GetResourceString("AppName");
+            AboutFlyoutVersion.Text = appName + " " + version.Major + "." + version.Minor + "." + version.Build + "." + version.Revision;
+        }
+
+        private void InitializeContributeTextBlock()
+        {
+            var resProvider = AppResourceProvider.GetInstance();
+            string contributeHyperlinkText = resProvider.GetResourceString("AboutFlyoutContribute");
+
+            // The resource string has the 'GitHub' hyperlink wrapped with '%HL%'.
+            // Break the string and assign pieces appropriately.
+            string delimiter = "%HL%";
+            int delimiterLength = delimiter.Length;
+
+            // Find the delimiters.
+            int firstSplitPosition = contributeHyperlinkText.IndexOf(delimiter, 0);
+            Debug.Assert(firstSplitPosition != -1);
+            int secondSplitPosition = contributeHyperlinkText.IndexOf(delimiter, firstSplitPosition + 1);
+            Debug.Assert(secondSplitPosition != -1);
+            int hyperlinkTextLength = secondSplitPosition - (firstSplitPosition + delimiterLength);
+
+            // Assign pieces.
+            var contributeTextBeforeHyperlink = contributeHyperlinkText.Substring(0, firstSplitPosition);
+            var contributeTextLink = contributeHyperlinkText.Substring(firstSplitPosition + delimiterLength, hyperlinkTextLength);
+            var contributeTextAfterHyperlink = contributeHyperlinkText.Substring(secondSplitPosition + delimiterLength);
+
+            ContributeRunBeforeLink.Text = contributeTextBeforeHyperlink;
+            ContributeRunLink.Text = contributeTextLink;
+            ContributeRunAfterLink.Text = contributeTextAfterHyperlink;
+        }
+    }
+}