Microsoft has unveiled the fifth preview of the .NET 11 platform.
The release includes updates to the Runtime, SDK, ASP.NET Core, .NET MAUI, Entity Framework Core, and the C# language.
Among the key features are support for JSON Lines serialization in System.Text.Json, full outer join in LINQ, the X25519 key convention mechanism, union declarations in C#, and the MCP Server template in the dotnet new command.
Microsoft has also improved runtime performance, JIT compiler optimizations, and garbage collector performance.
Windows developers are encouraged to use Visual Studio 2026 Insiders to test the new version of the platform.