😙 🙄 👵🏼 Introducing .NET 5.0 Preview 3 💃🏾 👨🏽‍🔧 🧝🏻

Introducing the new version of .NET 5.0 Preview 3. It contains a set of new features and performance improvements. We continue to work on more fundamental features that will be contained in the final release of 5.0. The article about .NET 5.0 Preview 1 covers what we plan to implement in .NET 5.0. Please check out the dotnet / designs publication and repository and share your feedback. And of course, please install Preview 3 and test your tasks with the new version.

You can download .NET 5.0 Preview 3 for Windows, macOS and Linux:

ASP.NET Core and EF Core are also now available.

Details about the version under the cut.

You should use Visual Studio 2019 16.5 to work with .NET 5.0. Install the latest C # extension to use .NET 5.0 with Visual Studio Code. .NET 5.0 is not yet supported in Visual Studio for Mac.

Together with the release:

Let's look at some improvements in Preview 3.

Improving code quality in RyuJIT

Each release includes a set of changes that improve the machine code that the JIT generates (we call it “code quality”). Better code quality means better application performance.

Vectorise BitArray for ARM64 – dotnet/runtime #33749 — BitArray - ARM64 ARM64. BitArray . @Gnbrkm41.
Implement simple version of On Stack Replacement (OSR) – dotnet/runtime #32969. (OSR) , , « » (allows the code executed by currently running methods to be changed in the middle of method execution, while those methods are active «on stack»). . , , .
Dynamic generic dictionary expansion feature dotnet/runtime #32270 – ( , ) , ( ), . . @RealDotNetDave .
Implement Vector.Ceiling/Vector.Floor dotnet/runtime #31993 – Vector.Ceiling/Vector.Floor x64 ARM64. API. @Gnbrkm41.
JIT: allow CORINFO_HELP_READYTORUN_GENERIC_HANDLE to be optimized dotnet/runtime #34221. Ready2Run.

System.Text.Json

preserve references JSON dotnet/runtime #655 – ReferenceLoopHandling, JSON.NET.
System.Net.Http.Json project/namespace dotnet/runtime #33459 – HttpClient, / JSON.
JsonConstructor parameterized ctors dotnet/runtime #33444 — JsonSerializer.
Adding JsonIgnoreCondition and ignore logic for each property # 34049 - Adds support for handling null values, which is another feature of JSON.NET serialization.

.NET SDK Support for the .NET Framework Assemblies

The .NET SDK will now automatically reference the Microsoft.NETFramework.ReferenceAssemblies NuGet package NuGet package based on the target .NET Framework in the project file. This change allows you to create .NET Framework projects on a computer without the .NET Framework targeting package installed. This improvement applies only to targeting packages and does not take into account other dependencies that the project may have.

Conclusion

We would be very happy to receive your feedback on release quality. Over the next few months there will be a lot of new things, but the main release will be released in November.

Introducing .NET 5.0 Preview 3

Improving code quality in RyuJIT

System.Text.Json

.NET SDK Support for the .NET Framework Assemblies

Conclusion

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