.NET 7 RC2 has been released as the latest Release Candidate (RC) for .NET 7, which has been tested with Visual Studio 17.4 Preview 3 and is supported in production environments.
Click here to download .NET 7 RC2 for Windows, macOS and Linux. To try .NET 7 in the Visual Studio family of products, we recommend building with the preview channel . If using macOS, the latest Visual Studio 2022 for Mac preview is recommended .
What's New in .NET 7 RC 2
Re-enable reflection fallback for System.Text.Json source generation
.NET 7 introduces a breaking change that removes the silent fallback for reflection-based serialization in the System.Text.Json source generator. But it seems that many users are still relying on fallback behavior. Therefore, starting with .NET 7 RC 2, users can re-enable reflection fallback globally using the AppContext compatibility switch.
Add the following entry to your application's project file to re-enable reflective fallback for all source build contexts in your application:
<ItemGroup> <RuntimeHostConfigurationOption Include="System.Text.Json.Serialization.EnableSourceGenReflectionFallback" Value="true" /> </ItemGroup>
For a detailed introduction to how to use the AppContext switch, see .NET Runtime Configuration Settings .
Correctly implement common math interface ( dotnet/runtime #69775 )
Ensure that the .NET Common Math Interface using the singular recursive template pattern (CRTP) is implemented correctly in user code. It will warn if a type implementing the .NET Generic Math Interface (implementing the CRTP schema) does not populate a generic type parameter with the type itself. E.g:
public readonly struct DateOnly : IParsable<DateOnly> // correct implementation of IParsable<TSelf> interface
{ ... }
public readonly struct MyDate : IParsable<DateOnly> // Warns: "The 'IParsable<TSelf>' requires the 'TSelf' type parameter to be filled with the derived type 'MyDate' " the type parameter TSelf
{ ... }
Prevent behavior changes in built-in operators for IntPtr and UIntPtr ( dotnet/runtime #74022 )
.NET 7 RC 2 related links:
- Installers and Binaries
- container image
- Linux package
- Release Notes
- known issues
- GitHub issue tracker
For additional content, check out the Microsoft Update Blog .