.NET 8 … and first glimpse at .NET 9

1. .NET 8
… and first glimpse at .NET 9
Codetherapist (aka Olivier Giss)
@code_therapist
Jürgen Gutsch
.NET junkie, addicted to web and software development, clean coder,
MVP for Developer Technologies
@sharpcms

2. Agenda
• .NET 8
• C# 12
• ASP.NET 8
• EF Core 8
• All about .NET 9
• Q&A

3. .NET 8
• Released at 14.11.2023
• Last: 8.0.3 14.03.2024
• LTS (Long Term Support, 3 years)
• End of Support: 10. November 2026
• .NET 7 End of Support: 14. May
2024
• .NET 6 End of Support: 12.
November 2024

4. Documentation
https://learn.microsoft.com/en-
us/dotnet/core/whats-new/dotnet-8
Breaking Changes:
https://learn.microsoft.com/en-
us/dotnet/core/compatibility/8.0
.NET 8
• New Projects should be started with .NET 8
• Performance improvements
• .NET Aspire – An opinionated stack to build production-ready
cloud-native applications
• .NET 8 Container – More secure, compact and productive
• Native AOT

5. .NET 8 Performance

6. .NET 8 Performance – AOT

7. https://learn.microsoft.com/en-
us/dotnet/core/whats-new/dotnet-
8/runtime
.NET 8 - Runtime • Arm64 performance improvements
• SIMD improvements
• Support for AVX-512 ISA extensions (see Vector512 and AVX-
512)
• Cloud-native improvements
• JIT throughput improvements
• Loop and general optimizations
• Optimized access for fields marked with ThreadStaticAttribute
• Consecutive register allocation. Arm64 has two instructions for
table vector lookup, which require that all entities in their tuple
operands are present in consecutive registers.
• JIT/NativeAOT can now unroll and auto-vectorize some memory
operations with SIMD, such as comparison, copying, and
zeroing, if it can determine their sizes at compile time.

8. https://learn.microsoft.com/en-
us/dotnet/core/whats-new/dotnet-
8/runtime
.NET 8 - SDK
• CLI-based project evaluation
• Terminal build output
• Simplified output paths
• 'dotnet workload clean' command
• 'dotnet publish' and 'dotnet pack' assets
• Template engine
• Source Link
• Source-build SDK

9. https://learn.microsoft.com/en-
us/aspnet/core/release-
notes/aspnetcore-
8.0?view=aspnetcore-8.0
.NET 8 – ASP.NET • Full-stack web UI
• New Blazor Web App template
• Render Razor components outside of ASP.NET Core
• SignalR stateful reconnect
• Antiforgery with minimal APIs
• Native AOT
• New project template
• New CreateSlimBuilder / CreateEmptyBuilder methods
• Securing Swagger UI endpoints
• Keyed services support in Dependency Injection
• Support for generic attributes

10. https://learn.microsoft.com/en-
us/ef/core/what-is-new/ef-core-
8.0/whatsnew
.NET 8 – EF Core
• Value objects using Complex Types
• Primitive collection properties
• Enhancements to JSON column mapping
• JSON Columns for SQLite
• HierarchyId in .NET and EF Core
• Raw SQL queries for unmapped types
• DateOnly/TimeOnly supported on SQL Server

11. https://learn.microsoft.com/en-
us/dotnet/maui/whats-new/dotnet-
8?view=net-maui-8.0
https://learn.microsoft.com/en-
us/dotnet/desktop/winforms/whats-
new/net80?view=netdesktop-8.0
https://learn.microsoft.com/en-
us/dotnet/desktop/wpf/whats-
new/net80?view=netdesktop-8.0
.NET 8 – MAUI,
WinForms & WPF • MAUI
• Controls
• Performance
• Gesture recognizers
• WinForms
• Data binding improvements
• Button Commands
• Visual Studio DPI improvements
• WPF
• Hardware acceleration
• OpenFolderDialog

12. • Primary constructors
C# 12

13. • Primary constructors
C# 12

14. • Default lambda parameters
C# 12

15. • Default lambda parameters
C# 12

16. • Alias any type
C# 12

17. https://learn.microsoft.com/en-
us/dotnet/core/whats-
new/dotnet-9/overview
.NET 9 is an STS Release
(Standard-term Support)
.NET 9 Preview 1 • LINQ
• CountBy
• AggregatedBy
• GroupBy
• Index
• Crypto
• KMAC algorithm
• CryptographicOperations.HashData() method
• Reflection
• Save Dynamic Assembly from AssemblyBuilder
• Performance
• Inlining improvements for Native AOT
• PGO improvements: Type checks and casts
• Arm64 vectorization in .NET libraries

18. • https://learn.microsoft.co
m/en-
us/dotnet/csharp/whats-
new/csharp-13
C# 13 • C# 13 is included in the .NET 9 Preview SDK and can
be used in the latest VS2022 preview

19. Q&A