.NET 9 has been released, so it's time to start porting our projects to the new version! In this article, we'll look at new features and enhancements: C# 13, performance, BuildCheck, GC, LINQ, NuGet Audit, and much more.
, where we've discussed partial properties and indexers, params collections, the new Lock class, object initialization using the "from the end" index, and much more. It's a joy to see that C# 13 brings more updates this year than last year. However, not all of them are really handy. What do you think of the update? Our team instantly came up with some fresh ideas for enhancing the C# analyzer rules.
Just like we always do, we're adding support for the latest .NET and C# versions. We'll introduce them in PVS-Studio 7.34, scheduled for early December. Subscribe to the to keep up with the latest updates.
Libraries
LINQ
In .NET 9, the , and . This is a more flexible analog of the common for , we'd used . .NET 9 has fixed it and introduced
Parallel test running
Now dotnet test enables us to run tests in parallel across various target frameworks for the same project. This is compatible with the new Terminal Logger.
and try the analyzer on your code base.
BuildCheck
.NET 9 has received a new feature to protect against bugs during the build process. To run a new mode, use the /check flag. Now .NET 9 includes several checks—though the number of checks will increase over time. Plus, we can write our ;
), introduced in .NET 8, is now enabled by default. DATAS adjusts the GC heap size depending on the application load.
JIT compilation enhancement
.NET 9 has brought tons of JIT-related enhancements, including better loop optimization, refined PGO, enhanced embedded methods, and more. It'd be incredibly challenging to list and explain all of these improvements here, those interested in the JIT-related improvements can check out the . If I've any noteworthy feature, please share them in the comments.
That's it. Now we set the alarm for one year and wait for the next .NET 10 release—it'll be a milestone anniversary :) As we look forward to .NET 10, tell us what features are you hoping to see?
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