Overview of .NET 9 Preview: New Features and Updates

.NET

NET 9, the successor to .NET 8, ushers in a new era of cloud-native application development and performance optimization. As a Standard Term Support (STS) release, it will be supported for 18 months. Here's what you need to know.

.NET Runtime

Several performance enhancements are included in the .NET 9 runtime, including.

Exception handling is faster.
Inline improvements for native AOT (Ahead of Time Compilation).
Improvements to looping and profile-guided optimization (PGO).
For more details, check out What’s new in the .NET 9 runtime.

.NET Libraries

The .NET 9 Libraries have improved in several areas, including the following.

Serialization.
Cryptography.
LINQ.
Reflection emit.
New TimeSpan.From* overloads
ActivatorUtilities.CreateInstance constructor
And more! Explore further What’s new in the .NET 9 libraries.

.NET SDK

The .NET 9 SDK introduces improvements such as,

Enhancements to the terminal logger.
Tool roll-forward capabilities.
Enhanced unit testing support.
Dive deeper into the details with What’s new in the SDK for .NET 9.

.NET Aspire

NET Aspire is a self-contained, cloud-ready stack for building observable, production-ready, distributed applications.
It’s delivered through a collection of NuGet packages that address the specific concerns of the cloud-native developer.
Currently available in preview for .NET 9. Learn more about .NET Aspire (Preview).

ASP.NET Core 9.0

ASP.NET Core continues to evolve with improvements.
Blazor
SignalR
Minimal APIs
Authentication and authorization
Dictionary debugging improvements
Discover them in What’s new in ASP.NET Core 9.0.

.NET MAUI

.NET MAUI (Multi-platform App UI) also receives updates. Explore them in What’s new in .NET MAUI for .NET 9.

Entity Framework Core 9

EF Core gets better with enhancements.
LINQ and SQL translation
ExecuteUpdate and ExecuteDelete
Migrations
Model building
SQL Server HierarchyId
Tooling
Learn about them in What’s New in EF Core 9.

C# 13

C# 13 ships with the .NET 9 SDK.
New escape sequence
Method group natural type
Implicit index access
Discover the latest features in What’s New in C# 13.

Remember, with a focus on productivity enhancements, streamlined deployments, and accelerated AI integration, .NET 9 elevates cloud-native and intelligent application development. For developers across a wide range of applications, it’s an exciting release!