RIT presentation on what's new and next for mobile development with .NET for Xamarin and .NET MAUI

1. What new & next for
mobile development
with .NET
James Montemagno (he/him)
Program Manager Lead, .NET Community
@jamesmontemagno

3. LIBRARIES
INFRASTRUCTURE
.NET
TOOLS
VISUAL STUDIO CODE
CLI
VISUAL STUDIO
VISUAL STUDIO FOR MAC
WEB CLOUD MOBILE GAMES IoT AI
DESKTOP

4. .NET ecosystem momentum
Top 30
40%
#1
Top 5
#1
2M
insights.stackoverflow.com/survey/2019#most-loved-dreaded-and-wanted & insights.stackoverflow.com/survey/2020#most-loved-dreaded-and-wanted
github.com/cncf/velocity/
octoverse.github.com/
https://www.techempower.com/benchmarks/#section=data-r19&hw=ph&test=plaintext

5. .NET adoption
200K
Windows developers migrated to .NET Core
230K
First time .NET developers in September 2020
2 million
Publishes per month to Linux from Visual Studio
WinForms & WPF
on .NET Core
.NET Core
.NET on Linux
5 million
.NET developers
Monthly active developers in Visual Studio Family

6. .NET
Framework
Mono /
Xamarin
.NET Core
.NET
Flexible deployment
Unparalleled performance
Reduced infrastructure & hosting costs
Modern, innovative languages and APIs
Why .NET 5?

7. .NET 5 performance improvements
 +30% socket performance improvement on Linux over .NET Core 3.1
 JSON serialization performance improved +19% over .NET Core 3.11
 Serialization of large collections & arrays improved 3x and are now zero-alloc
 gRPC server performance exceeds Go, C++ and Java2
1 All 104 JSON serialization benchmarks improved
2 https://github.com/LesnyRumcajs/grpc_bench/wiki/2020-08-11-bench-results
0
10000
20000
30000
40000
50000
60000
rust_tonic_mt dotnet_grpc go_grpc cpp_grpc_mt java_grpc
gRPC Server Performance Requests/Sec
(higher is better)

8.  .NET 5.0 released!
 Major releases every year in November
 LTS for even numbered releases
 Predictable schedule, minor releases as needed
.NET Schedule
Nov 2020
.NET 5.0
Nov 2021
.NET 6.0
LTS
Nov 2022
.NET 7.0
Nov 2023
.NET 8.0
LTS
Nov 2024
.NET 9.0

9. Mobile development

10. .NET
C# C#
Xamarin.Essentials
C#
Xamarin.Forms - UI
Delight Developers
Shared C# codebase • 100% native API access • High performance
Shared C#
Business Logic

11. Xamarin.Forms 5
• Beautiful Design with Brushes, Shapes, and Paths
• Control templating for native controls
• Improved XAML experience in Visual Studio
• Hot Reload 2.0
• Develop iOS apps on Windows

12. Demo
Xamarin.Forms 5

13. Xamarin.Forms 5
Gradients CarouselView Drag & Drop Paths & Shapes SwipeView

14. Flashlight
Geolocation
Preferences
Device Info
Device Display Info
Secure Settings
Accelerometer
Battery
Clipboard
Compass
Connectivity
Share
Email
File System
Geocoding
Gyroscope
Magnetometer
Phone Dialer
Screen Lock
Sms
Text to Speech
Vibration
Xamarin.Essentials
Email Attachments
Open Files Share File
Detect Shake

15. Xamarin Community Toolkit
github.com/xamarin/xamarincommunitytoolkit
Behaviors
• Animations
• Validators
• EventToCommand
• ImpliedOrderGrid
• Masked (input)
• UserStoppedTyping
Converters
• ByteArrayToImageSource
• ItemSelectedEventArgs
• MultiConverterParameter
• NotEqual
• TextCase
• MANY MORE!
Effects
• SafeArea
Extensions
• ImageResource
• Translate
• ValueConverter
Helpers
• Localization
• Subscription
• WeakEvent
ObjectModel
• AsyncCommand
• ObservableRangeCollection
Views
• CameraView
• Expander
• SideMenuView
• AvatarView
• RangeSlider

16. iOS macOS

17. iOS
Swift
Swift
Swift
Swift
Java
Java
Java
Java C++
C++
.NET
JS
Obj-C
Obj-C
Obj-C
Obj-C
macOS
JS
JS
JS
JS
Kotlin
Kotlin
Kotlin
Kotlin
JS
JS
JS
JS
iOS

18. iOS macOS
iOS
.NET
.NET .NET
.NET
.NET
.NET
.NET
.NET
.NET
.NET
.NET
.NET
.NET
.NET
.NET
.NET
.NET
.NET
.NET
.NET
.NET
.NET
.NET
.NET
.NET
.NET
.NET
.NET
.NET
.NET
.NET
.NET
.NET

19. Cross-platform, native UI
Single project system, single codebase
Deploy to multiple devices, mobile & desktop
General availability in .NET 6
.NET Multi-platform App UI
.NET 6
.NET Multi-platform App UI
github.com/dotnet/maui
WinUI Mac
Catalyst
Android
iOS
iOS
macOS

20. .NET Multi-platform App UI is the
evolution of Xamarin.Forms extended
from mobile to desktop scenarios with
UI controls rebuilt from the ground up
for performance and extensibility.

21. https://dotnet.microsoft.com/platform/customers

22. Native User Interfaces Native Performance
Native API Access
.NET

23. How is this native?
Android iOS macOS Windows
.NET for Android .NET for iOS / Mac Catalyst WinUI
.NET Multi-platform App UI
.NET Runtime (Mono or CoreCLR)
.NET BCL
App Code

24. Visual Design
MATERIAL DESIGN

25. AppThemes (Dark Mode)
Accessibility
Adaptive Triggers
Brushes – Solid & Gradient
Clipping
Cross-platform Lifecycle
CSS & Styles
Databinding (Compiled, Multi, Relative)
Dual Screen Support
Essentials (Sensors, Permissions, Sharing, etc.)
FontImageSource
Gestures
MessagingCenter
Microsoft.Extensions.*
Multi-Window
Navigation – URI based
Right-to-Left
Visual State Manager
XAML

28. Dec 2019
.NET Core 3.1
LTS
Nov 2020
.NET 5.0
Nov 2021
.NET 6.0
LTS
Nov 2022
.NET 7.0
Nov 2023
.NET 8.0
LTS
Yes, you should still create Xamarin apps until .NET MAUI ships!

29. More coming in .NET 6
https://themesof.net/

30. Thanks for joining!
Twitter - @jamesmontemagno