1. .NET7 Deep Dive
Udaiappa Ramachandran ( Udai )
https://udai.io

2. About me
• Udaiappa Ramachandran ( Udai )
• CTO-Akumina, Inc.
• Microsoft Azure MVP
• Cloud Expert
• Microsoft Azure, Amazon Web Services, and Google
• New Hampshire Cloud User Group (http://www.meetup.com/nashuaug )
• https://udai.io

3. Agenda
• .NET 7
• CLI & Documentation
• ASP.NET Core 7
• .NET MAUI
• Containers support
• Regular Expressions
• JSON Improvements
• AOT
• Demo…Demo…Demo…

4. .NET 6
https://udai.io/boston-net-6-deep-dive-virtual/

5. .NET 7 Downloads
https://dotnet.microsoft.com/en-us/download/dotnet/7.0

6. RoadMap
https://themesof.net/roadmap?product=.NET&release=7.0

7. CLI & Documentation
• Tab completion (PowerShell, bash, zsh, fish)
• dotnet add p<TAB>
• Tab completion for add will list the templates
• Angular, blazorserver, blazorwasm, classlib, console, editorconfig, gitignore, grpc, mstest, mvc,
nugetconfig, nunit, page, proto, razor, react, sln, tool-manifest, viewimports, viewstart, xunit,
web, webapi, webapp, webconfig, winforms, wpf, wpflib
• Documentation
• dotnet new--help

8. ASP.NET Core
• RateLimitter
• CacheOutput
• Minimal API Filters
• Binding QueryString to array of primitive types
• SignalR
• Nullable types support in MVC and Razor pages
• Blazor WebAssembly
• Access to Hardware API such as filesystem, webcam, etc.,
• Location changing Event
• JavaScript Interop to invoke .NET code
• HTTP 3 (preview)

9. Zero-to-Container
https://devblogs.microsoft.com/dotnet/announcing-builtin-container-support-for-the-dotnet-sdk/

10. .NET MAUI
• MAP Control
• Desktop UI improvements
• Context menu via the MenuFlyout control
• Tooltips
• Gestures
• Window size and position with size changed event
• Simplified IDE MAUI App

11. Regular Expressions
• Fast as compiled Regex
• Faster startup
• Better debugging
• New Regex source generator
• Regex Analyzers and Fixers
https://devblogs.microsoft.com/dotnet/regular-expression-improvements-in-dotnet-7/

12. JSON Improvements
• Serialize/Deserialize Object state to JSON Text
• System.Text.Json support polymorphic type hierarchy using JsonDerivedType
attributes
• JSON contract customization (automatic in .net 6 and earlier) using resolver
• Serialize private fields and properties
• Support multiple names for a property
• Ignore properties, based on name, type or value

13. AOT (Ahead-Of-Compilation)
• AOT generates machine code at build time
• Machine code is targeting specific OS and Hardware
• Multiple Executables against Win32, Win64, Linux64, etc.,
• Everything is platform native like Go, Swift and Rust are compiled
• .NET AOT Tools
• .NET 6
• CrossGen2
• ReadyToRun
• Mano AOT for Mobile
• .NET 7
• Native AOT
• Not a replacement of existing technologies but it adds new capabilities
• <publishAot>true</publishAot>

14. AOT (Ahead-Of-Compilation)
• Pros
• Faster startup time
• Smaller file size
• Smaller memory footprint on computer
• Cons
• Console apps only
• No reflection allowed
• No dynamic loading
• No runtime code generation

15. Central Package Management
• Create Directory.Packages.props with ManagePackageVersionsCentrally to
true and include Version
• Declare PackageReference items without Version attributes in project files
https://learn.microsoft.com/en-us/nuget/consume-packages/Central-Package-Management

16. Some of Other Improvements
• Brotli Compression
• Observability
• DateTime
• Tar Archives
• On-Stack Replacement (OSR)
• Profile-Guided Optimization (PGO)
• Much more……

17. Reference
• What’s new in .NET7: https://learn.microsoft.com/en-us/dotnet/core/whats-
new/dotnet-7
• Performance Improvements:
https://devblogs.microsoft.com/dotnet/performance_improvements_in_net_7
• YouTube Performance Improvements:
https://www.youtube.com/watch?v=yNPEdaxkTZw
• RoadMap: https://themesof.net/roadmap?product=.NET&release=7.0
• C#11: https://learn.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-11
• F#7: https://devblogs.microsoft.com/dotnet/announcing-fsharp-7
• Demo Samples: https://github.com/nhcloud/techtalk