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INTRODUCING .NET MAUI – ONE CODEBASE, MANY PLATFORMS
David Ortinau
May 23rd, 2022134
Welcome to .NET Multi-platform App UI. This release marks a new milestone in our
multi-year journey to unify the .NET platform. Now you and over 5 million other
.NET developers have a first-class, cross-platform UI stack targeting Android,
iOS, macOS, and Windows to complement the .NET toolchain (SDK) and base class
library (BCL). You can build anything with .NET.
> Join us at Microsoft Build 2022 where we’ll give you a tour of all the updates
> for building native apps for any device with .NET and Visual Studio. » Learn
> more.
This is just the beginning of our journey to create a desktop and mobile app
experience that delights .NET developers. For the next phase, the foundation is
now established for the broader .NET ecosystem to bring plugins, libraries, and
services from .NET Framework and the old project system to .NET 6 and SDK style
projects. Among those available today are:
AndroidX AlohaKit CommunityToolkit.MVVM CommunityToolkit.Maui CommunityToolkit
MauiCompat CommunityToolkit Markup.MauiCompat DevExpress Facebook FreshMvvm.Maui
Google APIs for iOS Google Play Services Client Libraries GrialKit MauiAnimation
Microsoft.Maui.Graphics MR.Gestures Prism.Maui Plugin.Fingerprint
Plugin.InAppBilling Plugin.StoreReview Plugin.ValidationRules ReactiveUI.Maui
Shiny SkiaSharp Syncfusion Telerik UI for .NET MAUI TemplateUI User Dialogs
> For help moving libraries to .NET 6, check out the recent guest blog posts
> detailing experiences shipping .NET MAUI libraries from Michael Rumpler
> (MR.Gestures) and Luis Matos (Plugin.ValidationRules).
The .NET MAUI workload is fully supported under the Current release schedule of
18 months, and will be serviced at the same monthly cadence as .NET. Our ongoing
focus for .NET MAUI continues to be quality, resolving known issues and
prioritizing issues based on your feedback. This also includes the workloads we
ship for building applications that exclusively target Android, Android Wear,
CarPlay, iOS, macOS, and tvOS directly using the native toolkits from .NET, and
the supporting libraries AndroidX, Facebook, Firebase, Google Play Services, and
SkiaSharp.
With .NET MAUI you can achieve no-compromise user experiences while sharing more
code than ever before. .NET MAUI uses native UI via the premier app toolkits
provided by each platform, modern developer productivity, and our fastest mobile
platform yet.
NATIVE UI, NO COMPROMISE
The primary goal of .NET MAUI is to enable you to deliver the best app
experience as designed specially by each platform (Android, iOS, macOS, Windows,
and Tizen thanks to collaboration with Samsung), while enabling you to craft
consistent brand experiences through rich styling and graphics. Out of the box,
each platform looks and behaves the way it should without any additional widgets
or styling required to mimic. For example, .NET MAUI on Windows is backed by
WinUI 3 the premier native UI component that ships with the Windows App SDK.
Use C# and XAML to build your apps from a rich toolkit of more than 40 controls,
layouts, and pages. Upon the Xamarin shoulders of mobile controls, .NET MAUI
adds support for multi-window desktop applications, menu bars, and new animation
capabilities, borders, corners, shadows, graphics, and more. Oh, and the new
BlazorWebView which I’ll highlight below.
Read more in the .NET MAUI documentation about controls: pages, layouts, and
views.
ACCESSIBILITY FIRST
One major advantage of using native UI is the inherited accessibility support
that we can build upon with semantic services to make it easier than ever to
create highly accessible applications. We have worked closely with customers to
redesign how we develop for accessibility. From these conversations we have
designed .NET MAUI semantic services for controlling:
* Properties such as description, hint, and heading level
* Focus
* Screen reader
* Automation properties
Read more in the .NET MAUI documentation about semantic services for
accessibility.
BEYOND UI
.NET MAUI provides simple APIs to access services and features of each platform
such as accelerometer, app actions, file system, notifications, and so much
more. In this example, we configure “app actions” that add menu options to the
app icon on each platform:
AppActions.SetAsync(
new AppAction("current_info", "Check Current Weather", icon: "current_info"),
new AppAction("add_location", "Add a Location", icon: "add_location")
);
Read more in the .NET MAUI documentation about accessing platform services and
features.
EASILY CUSTOMIZED
Whether you’re extending the capabilities of .NET MAUI controls or establishing
new platform functionality, .NET MAUI is architected for extensibility, so you
never hit a wall. Take, for example, the Entry control – a canonical example of
a control that renders differently on one platform. Android draws an underline
below the text field, and developers often want to remove that underline. With
.NET MAUI, customizing every Entry in your entire project is just a few lines of
code:
#if ANDROID
Microsoft.Maui.Handlers.EntryHandler.Mapper.ModifyMapping("NoUnderline", (h, v) =>
{
h.PlatformView.BackgroundTintList = ColorStateList.ValueOf(Colors.Transparent.ToPlatform());
});
#endif
Here is a great recent example of creating a new Map platform control by Cayas
Software. The blog post demonstrates creating a handler for the control,
implementation for each platform, and then making the control available by
registering it in .NET MAUI.
.ConfigureMauiHandlers(handlers =>
{
handlers.AddHandler(typeof(MapHandlerDemo.Maps.Map),typeof(MapHandler));
})
Read more in the .NET MAUI documentation about customizing controls with
handlers
MODERN DEVELOPER PRODUCTIVITY
More than being a technology that can build anything, we want .NET to also
accelerate your productivity using common language features, patterns and
practices, and tooling.
.NET MAUI uses the new C# 10 features introduced in .NET 6, including global
using statements and file scoped namespaces – great for reducing clutter and
cruft in your files. And .NET MAUI takes multi-targeting to a new level with
“single project” focus.
In new .NET MAUI projects, the platforms are nestled away in a subfolder giving
focus to your application where you spend the majority of your effort. Within
your project’s Resources folder you have a single place to manage your app’s
fonts, images, app icon, splash screen, raw assets, and styling. .NET MAUI will
do the work to optimize them for each platform’s unique requirements.
> Multi-project vs Single project Structuring your solution with Individual
> projects for each platform is still supported, so you can choose when the
> single project approach is appropriate for your applications.
.NET MAUI uses the builder pattern made popular with Microsoft.Extensions
libraries in ASP.NET and Blazor applications as a single place to initialize and
configure your app. From here, you can provide .NET MAUI with your fonts, tap
into platform specific lifecycle events, configure dependencies, enable specific
features, enable vendor control toolkits, and more.
public static class MauiProgram
{
public static MauiApp CreateMauiApp()
{
var builder = MauiApp.CreateBuilder();
builder
.UseMauiApp<App>()
.ConfigureServices()
.ConfigureFonts(fonts =>
{
fonts.AddFont("Segoe-Ui-Bold.ttf", "SegoeUiBold");
fonts.AddFont("Segoe-Ui-Regular.ttf", "SegoeUiRegular");
fonts.AddFont("Segoe-Ui-Semibold.ttf", "SegoeUiSemibold");
fonts.AddFont("Segoe-Ui-Semilight.ttf", "SegoeUiSemilight");
});
return builder.Build();
}
}
public static class ServicesExtensions
{
public static MauiAppBuilder ConfigureServices(this MauiAppBuilder builder)
{
builder.Services.AddMauiBlazorWebView();
builder.Services.AddSingleton<SubscriptionsService>();
builder.Services.AddSingleton<ShowsService>();
builder.Services.AddSingleton<ListenLaterService>();
#if WINDOWS
builder.Services.TryAddSingleton<SharedMauiLib.INativeAudioService, SharedMauiLib.Platforms.Windows.NativeAudioService>();
#elif ANDROID
builder.Services.TryAddSingleton<SharedMauiLib.INativeAudioService, SharedMauiLib.Platforms.Android.NativeAudioService>();
#elif MACCATALYST
builder.Services.TryAddSingleton<SharedMauiLib.INativeAudioService, SharedMauiLib.Platforms.MacCatalyst.NativeAudioService>();
builder.Services.TryAddSingleton< Platforms.MacCatalyst.ConnectivityService>();
#elif IOS
builder.Services.TryAddSingleton<SharedMauiLib.INativeAudioService, SharedMauiLib.Platforms.iOS.NativeAudioService>();
#endif
builder.Services.TryAddTransient<WifiOptionsService>();
builder.Services.TryAddSingleton<PlayerService>();
builder.Services.AddScoped<ThemeInterop>();
builder.Services.AddScoped<ClipboardInterop>();
builder.Services.AddScoped<ListenTogetherHubClient>(_ =>
new ListenTogetherHubClient(Config.ListenTogetherUrl));
return builder;
}
}
Read more in the .NET MAUI documentation about app startup with MauiProgram and
single project.
BRINGING BLAZOR TO DESKTOP AND MOBILE
.NET MAUI is also great for web developers looking to get in on the action with
native client apps. .NET MAUI integrates with Blazor, so you can reuse existing
Blazor web UI components directly in native mobile and desktop apps. With .NET
MAUI and Blazor, you can reuse your web development skills to build
cross-platform native client apps, and build a single UI that spans mobile,
desktop, and web.
.NET MAUI executes your Blazor components natively on the device (no WebAssembly
needed) and renders them to an embedded web view control. Because your Blazor
components compile and execute in the .NET process, they aren’t limited to the
web platform and can leverage any native platform feature, like notifications,
Bluetooth, geo-location and sensors, filesystem, and so much more. You can even
add native UI controls alongside your Blazor web UI. This is an all new kind of
hybrid app: Blazor Hybrid!
Getting started with .NET MAUI and Blazor is easy: just use the included .NET
MAUI Blazor App project template.
This template is all setup so you can start building a .NET MAUI Blazor app
using HTML, CSS, and C#. The Blazor Hybrid tutorial for .NET MAUI will walk you
through building and running your first .NET MAUI Blazor app.
Or add a BlazorWebView control to an existing .NET MAUI app wherever you want to
start using Blazor components:
<BlazorWebView HostPage="wwwroot/index.html">
<BlazorWebView.RootComponents>
<RootComponent Selector="#app" ComponentType="{x:Type my:Counter}" />
</BlazorWebView.RootComponents>
</BlazorWebView>
Blazor Hybrid support is also now available for WPF and Windows Forms so you can
start modernizing your existing desktop apps to run on the web or to run cross
platform with .NET MAUI. The BlazorWebView controls for WPF and Windows Forms
are available on NuGet. Check out the Blazor Hybrid tutorials for WPF and
Windows Forms to learn how to get started.
To learn more about Blazor Hybrid support for .NET MAUI, WPF, and Windows forms,
check out the Blazor Hybrid docs.
OPTIMIZED FOR SPEED
.NET MAUI is designed for performance. You have told us how critical it is for
your applications to start as quickly as possible, especially on Android. The UI
controls in .NET MAUI implement a thin, decoupled handler-mapper pattern over
the native platform controls. This reduces the number of layers in the rendering
of UI and simplifies control customization.
The layouts in .NET MAUI have been architected to use a consistent manager
pattern that optimizes the measure and arrange loops to more quickly render and
update your UI. We have also surfaced layouts pre-optimized for specific
scenarios such as HorizontalStackLayout and VerticalStackLayout in addition to
StackLayout.
From the very beginning of this journey, we set a goal to improve startup
performance and maintain or reduce app size as we transitioned to .NET 6. At the
time of GA, we’ve achieved a 34.9% improvement for .NET MAUI and 39.4%
improvement in .NET for Android. Those gains extend to complex apps as well; the
.NET Podcast sample application began with a startup of 1299ms and at GA
measures 814.2ms, a 37.3% improvement since Preview 13.
The settings are enabled by default to provide a release build with these
optimizations.
Stay tuned for a deep-dive blog post on what we have done to achieve these
results.
GET STARTED TODAY
To get started using .NET MAUI on Windows, install or update Visual Studio 2022
Preview to version 17.3 Preview 1.1. In the installer, choose the workload “.NET
Multi-platform App UI development”.
To use .NET MAUI on Mac, install the new Visual Studio 2022 preview for Mac
(17.3 Preview 1).
Visual Studio 2022 will GA .NET MAUI tooling support later this year. On Windows
today you can accelerate your dev loop with XAML and .NET Hot Reload, and
powerful editors for XAML, C#, Razor, and CSS among others. Using the XAML Live
Preview and Live Visual Tree, you can preview, align, inspect your UI, and edit
it while debugging. .NET MAUI’s new single project experience now includes
project property pages for a visual editing experience to configure your apps
with multi-platform targeting.
On Mac, you can today load single project and multi-project .NET MAUI solutions
to debug with a beautiful, new native Visual Studio 2022 for Mac experience.
Other features for enhancing your productivity developing .NET MAUI applications
will ship in subsequent previews.
We recommend getting started updating your libraries to .NET MAUI and creating
new .NET MAUI projects today. Before diving headlong into converting Xamarin
projects to .NET MAUI, review your dependencies, the state of Visual Studio
support for .NET MAUI, and the published known issues to identify the right time
to transition. Keep in mind that Xamarin will continue to be supported under the
modern lifecycle policy, which states 2 years from the last major release.
RESOURCES
* .NET MAUI – Workshop
* Building your first .NET MAUI app
* Documentation
* Known Issues
* Microsoft Learn Path
* Q&A Forums
* Release Notes
* Samples
* Support Policy – .NET MAUI
* Support Policy – Xamarin
WE NEED YOUR FEEDBACK
We’d love to hear from you! As you encounter any issues, file a report on GitHub
at dotnet/maui.
SUMMARY
With .NET MAUI, you can build native applications for Android, iOS, macOS,
Tizen, and Windows from a single codebase using the same productivity patterns
practiced all across .NET. The thin and decoupled UI and layout architecture of
.NET MAUI together with single project features enable you to stay focused on
one application instead of juggling the unique needs of multiple platforms. And
with .NET 6, we’re shipping performance improvements not only for Android, but
all across the breadth of platform targets.
Less platform code, more shared code, consistent standards and patterns,
lightweight and performant architecture, mobile and desktop native experiences –
this is just the beginning. We look forward to seeing libraries and the broader
ecosystem come alongside .NET MAUI in the following months to define a new era
of cross-platform application development for .NET developers that empowers you
and your organization to achieve more.
Get Started
DAVID ORTINAU PRINCIPAL PRODUCT MANAGER, .NET MULTI-PLATFORM APP UI
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Posted in .NET .NET MAUITagged .net maui releases
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134 COMMENTS
LEAVE A COMMENTCANCEL REPLY
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* Page 1of comments
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* Next comment
* Siggi Ullrich May 23, 2022 12:46 pm
collapse this comment
Just great
Log in to Reply
* Yahor Sinkevich May 23, 2022 1:02 pm
collapse this comment
web?
Log in to Reply
* David Ortinau May 23, 2022 1:53 pm
collapse this comment
If you’re targeting web, we recommend Blazor for that, and then bringing
those components to desktop and mobile with .NET MAUI and BlazorWebView.
Today for taking a mobile or desktop UI to web, we’d recommend considering
Uno.
I’d be interested in learning more about your interest and need. Shoot me a
message if you’ve like to discuss. david.ortinau@microsoft.com
Log in to Reply
* Erick Filzek May 23, 2022 9:51 pm
collapse this comment
Savid we have sent an email today and posted a comment we really need
your help! Please take a look and let make Maui happen and suceed !!!
Log in to Reply
* Peter N. Moore May 24, 2022 3:52 am
collapse this comment
https://github.com/dotnet/maui/discussions/62
One of the earliest and most upvoted discussions in the repo. You guys
know exactly what we all want and you know how to make it happen. As
impressive as your work here has been it’s simply impossible to take any
app framework seriously that doesn’t directly target web.
Log in to Reply
* Santiago Estrada Rubio May 25, 2022 11:34 pm
collapse this comment
I agree. Wise words, Peter.
Log in to Reply
* Omar Rodriguez May 24, 2022 4:27 am
collapse this comment
“Today for taking a mobile or desktop UI to web, we’d recommend
considering Uno”
Uno? What is that? Please share more info
Log in to Reply
* Peter N. Moore May 24, 2022 4:38 am
collapse this comment
Are you seriously asking Microsoft to Google something for you?
Log in to Reply
* Rand Random May 25, 2022 8:19 am
collapse this comment
Are you seriously asking Microsoft to Bing something for you?
fixed that for you
* Peter N. Moore May 24, 2022 4:38 am
collapse this comment
So Blazor, Uno, and MAUI. Your motto should be Why use one framework when
you can use three for three times the cost?
Log in to Reply
* anonymous May 24, 2022 7:04 am
collapse this comment
this comment has been deleted.
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* Tim Wong May 27, 2022 2:11 am
collapse this comment
Agree, don’t know why Microsoft reinvents the wheel today. The
community already has some stable solutions for multi-platform
development (such as “Uno platform”), so there’s no point in
reinventing the wheel. Acquisition makes more sense, not only for the
developer but also for resource utilization and integration.
Log in to Reply
* Andrew Witte May 24, 2022 1:11 pm
collapse this comment
Unity3D is has a more portable UI than anything MS has come out with. It
would almost be easier to write a portable app with that game-engine.
The solution is a Skia like rendering layer and UI built on top.
Blazor is a ridiculous bloatware suggestion. (how to increase app size &
decrease performance for no reason)
Log in to Reply
* Lukas June 15, 2022 12:25 am
collapse this comment
I’d love to use Uno Platform for new projects! As opposed to MAUI it has
the full WinUI XAML Syntax and feature set. And it is truly
cross-platform, including WebAssembly and Linux as target platforms.
But the performance is so horrible that this is a no-go for any end user
app. The startup time of an empty app is a multitude of that of an empty
MAUI or .NET Android app. Also the runtime performance is also bad (page
switch times). I don’t know what they are doing wrong. They use Xamarin
technology underneath, so theoretically, they should be able to bring
similar performance. I filed an issue two years ago, but nothing really
happened in the performance area.
I’d wish Microsoft would buy Uno, and have their experts do some serious
work on the performance side of things. Then this would be the definitive
#1 cross-platform UI framework for me.
Log in to Reply
* Robert O'Brien June 18, 2022 5:02 pm
collapse this comment
Curious about recommendation of generating ones web app story using
blazor, i.e. web assembly. Why not just go the route of using one of the
leading transpiler, vs framework, based native html5/ccs3/es6 single page
web app development offerings like svelte?
It would appear that .net maui’s ability to generate native android, iOS,
macOS, tizen and windows apps is a preferred approach to x-platform
native mobile/desktop store application development than the apache
cordova effort aimed at converting single page web app implementations
into native mobile/desktop store application solutions using the platform
specific native app web control container host.
Log in to Reply
* Nathan Loum May 23, 2022 1:31 pm
collapse this comment
Congratulations, nicely done! Is there a schedule on when the MVU coding
style will be available? Are you guys still planning on making Comet the
official MVU option for .NET MAUI?
Log in to Reply
* David Ortinau May 23, 2022 1:56 pm
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Comet will be shipping a version based on .NET MAUI GA, and we will be
ramping up our activity there in the coming weeks. It’ll continue as an
experiment for the time being as we determine what investment we should
make based on developer usage and need.
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* Ashish Khanal May 23, 2022 4:20 pm
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Thank you and Congratulations on MAUI GA release!
All the developers I know (myself included) would love to have Comet come
to .NET MAUI.
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* radioActive DROID May 23, 2022 5:49 pm
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Really looking forward to comet being supported, it a real blocker for me
i like c# a lot but don’t want to write my UI in XAML
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* Revi June 14, 2022 11:09 am
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Feel exactly the same, really don’t know why they continue with
XAML….Comet is a must in the modern world….
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* Jin Park May 23, 2022 2:48 pm
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I think I somehow messed up my mac m1 while removing old dotnet versions.
With everything installed on todays version or even the last RC I can restore
and build any other template types such as web but when I do: dotnet new maui
-n “MauiProj” and do a “dotnet restore” in that directory I get a bunch of
nuget errors like below. Its like nuget is only looking for linux versions.
Anyone have any ideas?
/Users/user/temp/MauiProj/MauiProj.csproj : error NU1102: Unable to find
package Microsoft.NETCore.App.Host.linux-arm with version (= 6.0.5)
[/Users/user/temp/MauiProj/MauiProj.sln]
/Users/user/temp/MauiProj/MauiProj.csproj : error NU1102: – Found 84
version(s) in nuget.org [ Nearest version: 7.0.0-preview.1.22076.8 ]
[/Users/user/temp/MauiProj/MauiProj.sln]
/Users/user/temp/MauiProj/MauiProj.csproj : error NU1102: – Found 0
version(s) in /usr/local/share/dotnet/library-packs
[/Users/user/temp/MauiProj/MauiProj.sln]
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* David Ortinau May 23, 2022 4:44 pm
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Try posting in the Q&A forum. I have guesses. Link back here to your forum
thread if you don’t get a solution.
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* anonymous May 24, 2022 1:59 am
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this comment has been deleted.
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* M San May 23, 2022 2:58 pm
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Teams desktop and Skype are excellent candidates for Blazor MAUI dogfooding
IMO.
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* Ashish Khanal May 23, 2022 4:22 pm
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Yes, Microsoft needs to use tools that they develop.
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* Roberto Mencia Franco May 25, 2022 3:58 am
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They should also create issues using their community portal and go
through the process to see what it feels like.
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* Rolf Kristensen May 26, 2022 12:56 pm
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Priceless
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* Daniel Smith May 23, 2022 3:57 pm
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Would it be possible to support Blazor WebAssembly PWAs as a target platform
in the future? You’d automatically have access to .NET with that, and it
would cover all the remaining gaps (Linux & web) with a single target.
I ask this because I’ve been playing with Blazor PWAs recently. You’ve got
complete flexibility to choose any web UI framework, however I couldn’t help
thinking that it would be great if there was a bunch of helper controls and
layouts like MAUI has.
If you can translate XAML to native controls on iOS and Android etc, then
surely it’s feasible to translate the visuals to HTML with bit of CSS magic
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* Andrew Beeman May 27, 2022 2:47 am
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I like this idea but I can assure you it’s fairly simple to share most of
the code now. I used interfaces for my services in Blazor that called data
from IndexedDB in the browser and I moved those to SQLite in Mobile /
Desktop. It only took a couple weeks to have a 90% shared code base.
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* Ashish Khanal May 23, 2022 4:31 pm
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Thank you and Congratulations on MAUI GA release! This is very exciting!
Few requests/ suggestions I can think of that will make MAUI even more
amazing:
1. Please bring C# markup to MAUI.
2. Dogfood MAUI in projects at Microsoft like Teams, Office, Visual Studio
for Mac etc. This will GREATLY build developer confidence.
3. Create great video tutorials and release them to freecodecamp YouTube
channel. This will expose MAUI to lot more developers.
Thank you!
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* Bret Johnson May 23, 2022 5:22 pm
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On C# markup, I’m curious to know more about what exactly you’d like to see
there – what syntax. Feel free to create a New Feature request here
https://github.com/dotnet/maui/issues and say more, to start a discussion
thread.
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* Yi Wang May 23, 2022 9:16 pm
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Do you have any idea about how huge those programs are? Rewritting them,
their supporting libs and all of their tool chain is insane. Why dont you
ask google to rewrite android studio using Flutter or Apple to rewrite
XCode with swfit?
This is good for mobile app level application.
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* Jarem Archer May 23, 2022 4:43 pm
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Acrylic support?
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* David Ortinau May 24, 2022 9:33 am
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Check out this example where Tim demonstrates using an Acrylic window and
Mica window.
https://github.com/drasticactions/DrasticMauiSamples/tree/main/MicaAcrylicWindows/Platforms/Windows
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* James Barton May 23, 2022 5:31 pm
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Love it; but I can’t get my MAUI app, when debugging on an android emulator,
to talk to my local API
https://stackoverflow.com/questions/72313635/net-maui-android-cant-talk-to-api-localhost
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* Emmanuel Adebiyi May 23, 2022 6:08 pm
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Congratulations to the community!
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