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Added code and tested for Android and Windows.
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‎LukeMauiFilePicker.Demo/App.xaml

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<?xml version = "1.0" encoding = "UTF-8" ?>
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<Application xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
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xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
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xmlns:local="clr-namespace:LukeMauiFilePicker.Demo"
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x:Class="LukeMauiFilePicker.Demo.App">
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<Application.Resources>
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<ResourceDictionary>
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<ResourceDictionary.MergedDictionaries>
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<ResourceDictionary Source="Resources/Styles/Colors.xaml" />
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<ResourceDictionary Source="Resources/Styles/Styles.xaml" />
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</ResourceDictionary.MergedDictionaries>
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</ResourceDictionary>
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</Application.Resources>
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</Application>

‎LukeMauiFilePicker.Demo/App.xaml.cs

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namespace LukeMauiFilePicker.Demo;
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public partial class App : Application
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{
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public App()
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{
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InitializeComponent();
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MainPage = new AppShell();
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}
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}

‎LukeMauiFilePicker.Demo/AppShell.xaml

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<?xml version="1.0" encoding="UTF-8" ?>
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<Shell
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x:Class="LukeMauiFilePicker.Demo.AppShell"
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xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
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xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
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xmlns:local="clr-namespace:LukeMauiFilePicker.Demo"
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Shell.FlyoutBehavior="Disabled">
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<ShellContent
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Title="Home"
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ContentTemplate="{DataTemplate local:MainPage}"
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Route="MainPage" />
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</Shell>

‎LukeMauiFilePicker.Demo/AppShell.xaml.cs

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namespace LukeMauiFilePicker.Demo;
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public partial class AppShell : Shell
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{
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public AppShell()
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{
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InitializeComponent();
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}
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}

‎LukeMauiFilePicker.Demo/LukeMauiFilePicker.Demo.csproj

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<TargetFrameworks>net7.0-android;net7.0-ios;net7.0-maccatalyst</TargetFrameworks>
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<TargetFrameworks Condition="$([MSBuild]::IsOSPlatform('windows'))">$(TargetFrameworks);net7.0-windows10.0.19041.0</TargetFrameworks>
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<OutputType>Exe</OutputType>
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<RootNamespace>LukeMauiFilePicker.Demo</RootNamespace>
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<UseMaui>true</UseMaui>
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<SingleProject>true</SingleProject>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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<!-- Display name -->
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<ApplicationTitle>LukeMauiFilePicker.Demo</ApplicationTitle>
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<!-- App Identifier -->
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<ApplicationId>com.lukevo.lukemauifilepicker</ApplicationId>
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<ApplicationIdGuid>1e8dbbec-f2da-4025-b895-1b019d4ace88</ApplicationIdGuid>
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<!-- Versions -->
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<ApplicationDisplayVersion>1.0</ApplicationDisplayVersion>
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<ApplicationVersion>1</ApplicationVersion>
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<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'ios'">11.0</SupportedOSPlatformVersion>
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<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'maccatalyst'">13.1</SupportedOSPlatformVersion>
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<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'android'">21.0</SupportedOSPlatformVersion>
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<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'windows'">10.0.17763.0</SupportedOSPlatformVersion>
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<TargetPlatformMinVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'windows'">10.0.17763.0</TargetPlatformMinVersion>
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<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'tizen'">6.5</SupportedOSPlatformVersion>
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</PropertyGroup>
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<ItemGroup>
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<!-- App Icon -->
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<MauiIcon Include="Resources\AppIcon\appicon.svg" ForegroundFile="Resources\AppIcon\appiconfg.svg" Color="#512BD4" />
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<!-- Splash Screen -->
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<MauiSplashScreen Include="Resources\Splash\splash.svg" Color="#512BD4" BaseSize="128,128" />
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<!-- Images -->
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<MauiImage Include="Resources\Images\*" />
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<MauiImage Update="Resources\Images\dotnet_bot.svg" BaseSize="168,208" />
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<!-- Custom Fonts -->
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<MauiFont Include="Resources\Fonts\*" />
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<!-- Raw Assets (also remove the "Resources\Raw" prefix) -->
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<MauiAsset Include="Resources\Raw\**" LogicalName="%(RecursiveDir)%(Filename)%(Extension)" />
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</ItemGroup>
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<ItemGroup>
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<PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="7.0.0" />
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</ItemGroup>
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<ItemGroup>
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<ProjectReference Include="..\LukeMauiFilePicker\LukeMauiFilePicker.csproj" />
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</ItemGroup>
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</Project>

‎LukeMauiFilePicker.Demo/MainPage.xaml

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<?xml version="1.0" encoding="utf-8" ?>
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<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
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xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
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x:Class="LukeMauiFilePicker.Demo.MainPage">
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<VerticalStackLayout>
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<Button Text="Pick a Single File" Clicked="PickOne" Margin="10" />
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<Button Text="Pick Multiple Files" Clicked="PickMany" Margin="10" />
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<Editor x:Name="TextEditor" HeightRequest="200" Margin="10" />
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<Button Text="Save" Clicked="Save" Margin="10" />
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</VerticalStackLayout>
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</ContentPage>

‎LukeMauiFilePicker.Demo/MainPage.xaml.cs

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using System.Text;
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namespace LukeMauiFilePicker.Demo;
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public partial class MainPage : ContentPage
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{
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static readonly Dictionary<DevicePlatform, IEnumerable<string>> FileType = new()
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{
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{ DevicePlatform.Android, new[] { "text/*" } } ,
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{ DevicePlatform.iOS, new[] { ".txt", ".json" } },
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{ DevicePlatform.WinUI, new[] { ".txt", ".json" } }
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};
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readonly IFilePickerService picker;
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public MainPage(IFilePickerService picker)
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{
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this.picker = picker;
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InitializeComponent();
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}
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async Task OnFilesPickedAsync(IEnumerable<IPickFile> files)
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{
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var str = new StringBuilder();
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foreach (var f in files)
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{
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using var s = await f.OpenReadAsync();
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using var reader = new StreamReader(s);
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str.AppendLine(await reader.ReadToEndAsync());
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}
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await MainThread.InvokeOnMainThreadAsync(() =>
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{
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TextEditor.Text = str.ToString();
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});
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}
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private async void PickOne(object sender, EventArgs e)
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{
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var file = await picker.PickFileAsync("Select a file", FileType);
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if (file is null) { return; }
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await OnFilesPickedAsync(new[] { file });
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}
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private async void PickMany(object sender, EventArgs e)
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{
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var files = await picker.PickFilesAsync("Select a file", FileType, true);
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if (files is null || !files.Any()) { return; }
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await OnFilesPickedAsync(files);
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}
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private async void Save(object sender, EventArgs e)
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{
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var bytes = Encoding.UTF8.GetBytes(TextEditor.Text ?? "");
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using var memory = new MemoryStream(bytes);
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await picker.SaveFileAsync(new("text.txt", memory)
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{
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AndroidMimeType = "text/plain",
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WindowsFileTypes = ("Text files", new() { ".txt", })
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});
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}
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}
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‎LukeMauiFilePicker.Demo/MauiProgram.cs

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using Microsoft.Extensions.Logging;
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using Microsoft.Maui.LifecycleEvents;
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namespace LukeMauiFilePicker.Demo;
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public static class MauiProgram
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{
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public static MauiApp CreateMauiApp()
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{
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var builder = MauiApp.CreateBuilder();
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builder
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.UseMauiApp<App>()
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.ConfigureFonts(fonts =>
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{
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fonts.AddFont("OpenSans-Regular.ttf", "OpenSansRegular");
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fonts.AddFont("OpenSans-Semibold.ttf", "OpenSansSemibold");
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})
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.ConfigureFilePicker(100);
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builder.Services
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.AddFilePicker()
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.AddSingleton<MainPage>();
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#if DEBUG
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builder.Logging.AddDebug();
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#endif
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return builder.Build();
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}
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}

‎LukeMauiFilePicker.Demo/Platforms/Android/AndroidManifest.xml

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<?xml version="1.0" encoding="utf-8"?>
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<manifest xmlns:android="http://schemas.android.com/apk/res/android">
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<application android:allowBackup="true" android:icon="@mipmap/appicon" android:roundIcon="@mipmap/appicon_round" android:supportsRtl="true"></application>
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<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
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<uses-permission android:name="android.permission.INTERNET" />
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</manifest>

‎LukeMauiFilePicker.Demo/Platforms/Android/MainActivity.cs

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using Android.App;
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using Android.Content.PM;
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using Android.OS;
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namespace LukeMauiFilePicker.Demo;
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[Activity(Theme = "@style/Maui.SplashTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation | ConfigChanges.UiMode | ConfigChanges.ScreenLayout | ConfigChanges.SmallestScreenSize | ConfigChanges.Density)]
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public class MainActivity : MauiAppCompatActivity
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{
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}

‎LukeMauiFilePicker.Demo/Platforms/Android/MainApplication.cs

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using Android.App;
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using Android.Runtime;
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namespace LukeMauiFilePicker.Demo;
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[Application]
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public class MainApplication : MauiApplication
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{
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public MainApplication(IntPtr handle, JniHandleOwnership ownership)
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: base(handle, ownership)
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{
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}
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protected override MauiApp CreateMauiApp() => MauiProgram.CreateMauiApp();
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}

‎LukeMauiFilePicker.Demo/Platforms/Android/Resources/values/colors.xml

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<?xml version="1.0" encoding="utf-8"?>
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<resources>
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<color name="colorPrimary">#512BD4</color>
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<color name="colorPrimaryDark">#2B0B98</color>
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<color name="colorAccent">#2B0B98</color>
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</resources>

‎LukeMauiFilePicker.Demo/Platforms/MacCatalyst/AppDelegate.cs

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using Foundation;
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namespace LukeMauiFilePicker.Demo;
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[Register("AppDelegate")]
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public class AppDelegate : MauiUIApplicationDelegate
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{
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protected override MauiApp CreateMauiApp() => MauiProgram.CreateMauiApp();
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}

‎LukeMauiFilePicker.Demo/Platforms/MacCatalyst/Info.plist

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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
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<plist version="1.0">
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<dict>
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<key>UIDeviceFamily</key>
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<array>
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<integer>1</integer>
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<integer>2</integer>
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</array>
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<key>UIRequiredDeviceCapabilities</key>
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<array>
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<string>arm64</string>
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</array>
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<key>UISupportedInterfaceOrientations</key>
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<array>
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<string>UIInterfaceOrientationPortrait</string>
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<string>UIInterfaceOrientationLandscapeLeft</string>
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<string>UIInterfaceOrientationLandscapeRight</string>
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</array>
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<key>UISupportedInterfaceOrientations~ipad</key>
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<array>
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<string>UIInterfaceOrientationPortrait</string>
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<string>UIInterfaceOrientationPortraitUpsideDown</string>
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<string>UIInterfaceOrientationLandscapeLeft</string>
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<string>UIInterfaceOrientationLandscapeRight</string>
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</array>
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<key>XSAppIconAssets</key>
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<string>Assets.xcassets/appicon.appiconset</string>
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</dict>
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</plist>

‎LukeMauiFilePicker.Demo/Platforms/MacCatalyst/Program.cs

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using ObjCRuntime;
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using UIKit;
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namespace LukeMauiFilePicker.Demo;
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public class Program
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{
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// This is the main entry point of the application.
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static void Main(string[] args)
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{
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// if you want to use a different Application Delegate class from "AppDelegate"
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// you can specify it here.
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UIApplication.Main(args, null, typeof(AppDelegate));
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}
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}

‎LukeMauiFilePicker.Demo/Platforms/Tizen/Main.cs

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using Microsoft.Maui;
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using Microsoft.Maui.Hosting;
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using System;
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namespace LukeMauiFilePicker.Demo;
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internal class Program : MauiApplication
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{
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protected override MauiApp CreateMauiApp() => MauiProgram.CreateMauiApp();
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static void Main(string[] args)
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{
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var app = new Program();
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app.Run(args);
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}
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}

‎LukeMauiFilePicker.Demo/Platforms/Tizen/tizen-manifest.xml

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<?xml version="1.0" encoding="utf-8"?>
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<manifest package="maui-application-id-placeholder" version="0.0.0" api-version="7" xmlns="http://tizen.org/ns/packages">
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<profile name="common" />
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<ui-application appid="maui-application-id-placeholder" exec="LukeMauiFilePicker.Demo.dll" multiple="false" nodisplay="false" taskmanage="true" type="dotnet" launch_mode="single">
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<label>maui-application-title-placeholder</label>
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<icon>maui-appicon-placeholder</icon>
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<metadata key="http://tizen.org/metadata/prefer_dotnet_aot" value="true" />
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</ui-application>
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<shortcut-list />
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<privileges>
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<privilege>http://tizen.org/privilege/internet</privilege>
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</privileges>
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<dependencies />
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<provides-appdefined-privileges />
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</manifest>

‎LukeMauiFilePicker.Demo/Platforms/Windows/App.xaml

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<maui:MauiWinUIApplication
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x:Class="LukeMauiFilePicker.Demo.WinUI.App"
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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xmlns:maui="using:Microsoft.Maui"
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xmlns:local="using:LukeMauiFilePicker.Demo.WinUI">
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</maui:MauiWinUIApplication>

‎LukeMauiFilePicker.Demo/Platforms/Windows/App.xaml.cs

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using Microsoft.UI.Xaml;
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// To learn more about WinUI, the WinUI project structure,
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// and more about our project templates, see: http://aka.ms/winui-project-info.
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namespace LukeMauiFilePicker.Demo.WinUI;
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/// <summary>
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/// Provides application-specific behavior to supplement the default Application class.
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/// </summary>
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public partial class App : MauiWinUIApplication
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{
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/// <summary>
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/// Initializes the singleton application object. This is the first line of authored code
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/// executed, and as such is the logical equivalent of main() or WinMain().
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/// </summary>
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public App()
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{
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this.InitializeComponent();
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}
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protected override MauiApp CreateMauiApp() => MauiProgram.CreateMauiApp();
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}
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