Microsoft has released the fourth preview of .NET 10, bringing a range of enhancements across ASP.NET Core, Blazor, .NET MAUI, WPF, Entity Framework Core, and the runtime.
This version introduces a new JSON Patch implementation using System.Text.Json in ASP.NET Core, providing a more efficient alternative to the previous Newtonsoft.Json-based version. While it improves performance and reduces memory use, there is a note that the new implementation does not support dynamic types and is not a full drop-in replacement.
Furthermore, support for minimal API validation has been extended to record types, and developers can now generate OpenAPI schemas programmatically using transformers. These schemas can be dynamically added to OpenAPI documents using the newly added…