Latest .NET 10 preview also features improved SQL translation in Entity Framework Core and a WebSocketStream API that simplifies common WebSocket scenarios.
The latest preview of Microsoft’s planned .NET 10 application development platform is now available, featuring a source generator for XAML and improved translation for parameterized collections in Entity Framework Core.
This preview was unveiled August 12 and can be downloaded from dotnet.microsoft.com. The production release of .NET 10 is expected in November.
For XAML, .NET MAUI (Multi-platform App UI) now has a source generator for XAML that improves build performance and enables better tools support, Microsoft said. The generator creates strongly typed code for XAML files at compile time, reducing runtime overhead and providing better IntelliSense support. The generator decorates generated types with the [Generated] attribute for better tool integration and debugging support.
With Entity Framework Core 10, the next version of the object-relational mapper, a new default translation mode is introduced for parameterized collections, where each value in the collection is translated into its own scalar parameter. This allows collection values to change without resulting in different SQL code, which results in cache misses and other performance problems, Microsoft said.
Also introduced in .NET 10 Preview 7 is WebSocketStream, an API designed to simplify common WebSocket scenarios in .NET. Traditional WebSocket APIs are low-level and require significant boilerplate for tasks such as handling buffering and framing and managing encoding and decoding, Microsoft said. These complexities make it difficult to use WebSockets as a transport, especially for apps with streaming or text-based protocols. WebSocketStream addresses these issues by providing a Stream-based abstraction over a WebSocket, enabling seamless integration with existing APIs.
Other new features and improvements in .NET 10 Preview 7:
- For Windows,
ProcessStartInfo.CreateNewProcessGroupcan be used to launch a process in a separate process group. JsonSerializer.Deserializenow supportsPipeReader, complementing existingPipeWritersupport.- A new configuration option,
ExceptionHandlerOptions.SuppressDiagnosticsCallback, has been added to the ASP.NET Core exception handler middleware to control diagnostic output. - APIs for passkey authentication in ASP.NET Core Identity have been updated and simplified.
No new features were added for the .NET runtime or for the Visual Basic, C#, and F# languages in Preview 7, Microsoft noted. .NET 10 Preview 7 follows .NET 10 Preview 6, which was released July 15 and featured improved JIT code generation. Preview 5 was released June 10 and featured C# 14 and runtime enhancements. .NET 10 Preview 1 arrived February 25, followed by Preview 2 on March 18, Preview 3 on April 10, and Preview 4 on May 13.
