Add project files.

PiPiano.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 15
+VisualStudioVersion = 15.0.27130.2036
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "PiPiano", "PiPiano\PiPiano.csproj", "{34106E64-4347-425F-B96B-1ECC3E649328}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|ARM = Debug|ARM
+		Debug|x64 = Debug|x64
+		Debug|x86 = Debug|x86
+		Release|ARM = Release|ARM
+		Release|x64 = Release|x64
+		Release|x86 = Release|x86
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{34106E64-4347-425F-B96B-1ECC3E649328}.Debug|ARM.ActiveCfg = Debug|ARM
+		{34106E64-4347-425F-B96B-1ECC3E649328}.Debug|ARM.Build.0 = Debug|ARM
+		{34106E64-4347-425F-B96B-1ECC3E649328}.Debug|ARM.Deploy.0 = Debug|ARM
+		{34106E64-4347-425F-B96B-1ECC3E649328}.Debug|x64.ActiveCfg = Debug|x64
+		{34106E64-4347-425F-B96B-1ECC3E649328}.Debug|x64.Build.0 = Debug|x64
+		{34106E64-4347-425F-B96B-1ECC3E649328}.Debug|x64.Deploy.0 = Debug|x64
+		{34106E64-4347-425F-B96B-1ECC3E649328}.Debug|x86.ActiveCfg = Debug|x86
+		{34106E64-4347-425F-B96B-1ECC3E649328}.Debug|x86.Build.0 = Debug|x86
+		{34106E64-4347-425F-B96B-1ECC3E649328}.Debug|x86.Deploy.0 = Debug|x86
+		{34106E64-4347-425F-B96B-1ECC3E649328}.Release|ARM.ActiveCfg = Release|ARM
+		{34106E64-4347-425F-B96B-1ECC3E649328}.Release|ARM.Build.0 = Release|ARM
+		{34106E64-4347-425F-B96B-1ECC3E649328}.Release|ARM.Deploy.0 = Release|ARM
+		{34106E64-4347-425F-B96B-1ECC3E649328}.Release|x64.ActiveCfg = Release|x64
+		{34106E64-4347-425F-B96B-1ECC3E649328}.Release|x64.Build.0 = Release|x64
+		{34106E64-4347-425F-B96B-1ECC3E649328}.Release|x64.Deploy.0 = Release|x64
+		{34106E64-4347-425F-B96B-1ECC3E649328}.Release|x86.ActiveCfg = Release|x86
+		{34106E64-4347-425F-B96B-1ECC3E649328}.Release|x86.Build.0 = Release|x86
+		{34106E64-4347-425F-B96B-1ECC3E649328}.Release|x86.Deploy.0 = Release|x86
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {8F6E9781-B406-4875-B524-39B02C751DC8}
+	EndGlobalSection
+EndGlobal

PiPiano/App.xaml

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+<Application
+    x:Class="PiPiano.App"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="using:PiPiano"
+    RequestedTheme="Light">
+
+</Application>

PiPiano/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;
+
+namespace PiPiano
+{
+    /// <summary>
+    /// Provides application-specific behavior to supplement the default Application class.
+    /// </summary>
+    sealed partial class App : Application
+    {
+        /// <summary>
+        /// Initializes the singleton application object.  This is the first line of authored code
+        /// executed, and as such is the logical equivalent of main() or WinMain().
+        /// </summary>
+        public App()
+        {
+            this.InitializeComponent();
+            this.Suspending += OnSuspending;
+        }
+
+        /// <summary>
+        /// Invoked when the application is launched normally by the end user.  Other entry points
+        /// will be used such as when the application is launched to open a specific file.
+        /// </summary>
+        /// <param name="e">Details about the launch request and process.</param>
+        protected override void OnLaunched(LaunchActivatedEventArgs e)
+        {
+            Frame rootFrame = Window.Current.Content as Frame;
+
+            // Do not repeat app initialization when the Window already has content,
+            // just ensure that the window is active
+            if (rootFrame == null)
+            {
+                // Create a Frame to act as the navigation context and navigate to the first page
+                rootFrame = new Frame();
+
+                rootFrame.NavigationFailed += OnNavigationFailed;
+
+                if (e.PreviousExecutionState == ApplicationExecutionState.Terminated)
+                {
+                    //TODO: Load state from previously suspended application
+                }
+
+                // Place the frame in the current Window
+                Window.Current.Content = rootFrame;
+            }
+
+            if (e.PrelaunchActivated == false)
+            {
+                if (rootFrame.Content == null)
+                {
+                    // When the navigation stack isn't restored navigate to the first page,
+                    // configuring the new page by passing required information as a navigation
+                    // parameter
+                    rootFrame.Navigate(typeof(MainPage), e.Arguments);
+                }
+                // Ensure the current window is active
+                Window.Current.Activate();
+            }
+        }
+
+        /// <summary>
+        /// Invoked when Navigation to a certain page fails
+        /// </summary>
+        /// <param name="sender">The Frame which failed navigation</param>
+        /// <param name="e">Details about the navigation failure</param>
+        void OnNavigationFailed(object sender, NavigationFailedEventArgs e)
+        {
+            throw new Exception("Failed to load Page " + e.SourcePageType.FullName);
+        }
+
+        /// <summary>
+        /// Invoked when application execution is being suspended.  Application state is saved
+        /// without knowing whether the application will be terminated or resumed with the contents
+        /// of memory still intact.
+        /// </summary>
+        /// <param name="sender">The source of the suspend request.</param>
+        /// <param name="e">Details about the suspend request.</param>
+        private void OnSuspending(object sender, SuspendingEventArgs e)
+        {
+            var deferral = e.SuspendingOperation.GetDeferral();
+            //TODO: Save application state and stop any background activity
+            deferral.Complete();
+        }
+    }
+}

PiPiano/MainPage.xaml

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+<Page
+    x:Class="PiPiano.MainPage"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="using:PiPiano"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    mc:Ignorable="d">
+
+    <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
+        <StackPanel Orientation="Horizontal" Spacing="20" HorizontalAlignment="Center">
+            <Button Tag="0" Height="200" Width="40" Click="Button_Click"></Button>
+            <Button Tag="1" Height="200" Width="40" Click="Button_Click"></Button>
+            <Button Tag="2" Height="200" Width="40" Click="Button_Click"></Button>
+            <Button Tag="3" Height="200" Width="40" Click="Button_Click"></Button>
+            <Button Tag="4" Height="200" Width="40" Click="Button_Click"></Button>
+            <Button Tag="5" Height="200" Width="40" Click="Button_Click"></Button>
+            <Button Tag="6" Height="200" Width="40" Click="Button_Click"></Button>
+            <Button Tag="7" Height="200" Width="40" Click="Button_Click"></Button>
+        </StackPanel>
+    </Grid>
+</Page>

PiPiano/MainPage.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.Devices.Gpio;
+using Windows.Foundation;
+using Windows.Foundation.Collections;
+using Windows.Media.Core;
+using Windows.Media.Playback;
+using Windows.Storage;
+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;
+
+// The Blank Page item template is documented at https://go.microsoft.com/fwlink/?LinkId=402352&clcid=0x409
+
+namespace PiPiano
+{
+    /// <summary>
+    /// An empty page that can be used on its own or navigated to within a Frame.
+    /// </summary>
+    public sealed partial class MainPage : Page
+    {
+        private const int PB_PIN_START = 5;
+        private GpioPin[] pushButtons = new GpioPin[8];
+        private bool[] downStates = new bool[8];
+        private DispatcherTimer timer;
+        private MediaPlayer player = new MediaPlayer();
+
+
+
+        public MainPage()
+        {
+            this.InitializeComponent();
+
+            var gpio = GpioController.GetDefault();
+            if (gpio != null)
+            {
+                InitGPIO(gpio);
+                timer = new DispatcherTimer();
+                timer.Interval = TimeSpan.FromMilliseconds(500);
+                timer.Tick += Timer_Tick;
+                timer.Start();
+            }
+        }
+
+        private void InitGPIO(GpioController gpio)
+        {
+            for (int i = 0; i < pushButtons.Length; i++)
+            {
+                pushButtons[i] = gpio.OpenPin(i + PB_PIN_START);
+                pushButtons[i].SetDriveMode(GpioPinDriveMode.Input);
+                downStates[i] = false;
+            }
+        }
+
+        private void Timer_Tick(object sender, object e)
+        {
+            CheckButtonState();
+        }
+
+        private void CheckButtonState()
+        {
+            for (int i = 0; i < pushButtons.Length; i++)
+            {
+                bool isPinOn = pushButtons[i].Read() == GpioPinValue.High;
+                if (downStates[i] != isPinOn && isPinOn)
+                    playNote(i);
+                downStates[i] = isPinOn;
+            }
+        }
+
+        private void playNote(int i)
+        {
+            MediaPlayer mediaPlayer = new MediaPlayer();
+            mediaPlayer.Source = MediaSource.CreateFromUri(new Uri($"ms-appx:///Assets/sound{i}.wav"));
+            mediaPlayer.Play();
+        }
+
+        private void Button_Click(object sender, RoutedEventArgs e)
+        {
+            playNote(int.Parse((e.OriginalSource as Button).Tag.ToString()));
+        }
+    }
+}

PiPiano/Package.appxmanifest

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+<?xml version="1.0" encoding="utf-8"?>
+
+<Package
+  xmlns="http://schemas.microsoft.com/appx/manifest/foundation/windows10"
+  xmlns:mp="http://schemas.microsoft.com/appx/2014/phone/manifest"
+  xmlns:uap="http://schemas.microsoft.com/appx/manifest/uap/windows10"
+  IgnorableNamespaces="uap mp">
+
+  <Identity
+    Name="6fc4e9b4-320f-4bba-a48f-cf8bce9a95b7"
+    Publisher="CN=julia"
+    Version="1.0.0.0" />
+
+  <mp:PhoneIdentity PhoneProductId="6fc4e9b4-320f-4bba-a48f-cf8bce9a95b7" PhonePublisherId="00000000-0000-0000-0000-000000000000"/>
+
+  <Properties>
+    <DisplayName>PiPiano</DisplayName>
+    <PublisherDisplayName>julia</PublisherDisplayName>
+    <Logo>Assets\StoreLogo.png</Logo>
+  </Properties>
+
+  <Dependencies>
+    <TargetDeviceFamily Name="Windows.Universal" MinVersion="10.0.0.0" MaxVersionTested="10.0.0.0" />
+  </Dependencies>
+
+  <Resources>
+    <Resource Language="x-generate"/>
+  </Resources>
+
+  <Applications>
+    <Application Id="App"
+      Executable="$targetnametoken$.exe"
+      EntryPoint="PiPiano.App">
+      <uap:VisualElements
+        DisplayName="PiPiano"
+        Square150x150Logo="Assets\Square150x150Logo.png"
+        Square44x44Logo="Assets\Square44x44Logo.png"
+        Description="PiPiano"
+        BackgroundColor="transparent">
+        <uap:DefaultTile Wide310x150Logo="Assets\Wide310x150Logo.png"/>
+        <uap:SplashScreen Image="Assets\SplashScreen.png" />
+      </uap:VisualElements>
+    </Application>
+  </Applications>
+
+  <Capabilities>
+    <Capability Name="internetClient" />
+  </Capabilities>
+</Package>