Here's What’s New in .NET 9!

.NET 9 offers performance improvements and usability enhancements without groundbreaking features, much like a phone upgrade. A significant omission is the removal of implicit extension types from C# 13. However, the release includes notable LINQ upgrades, such as Index and CountBy for easier collection manipulation and AggregateBy for efficient total calculations. UUID version 7 is introduced for faster database querying. HTTP/3 is enabled by default, improving network performance, though compatibility considerations exist. A new, improved Lock type enhances thread safety. C# 13 introduces implicit index access for simplified array initialization. ASP.NET Core 9 adds hybrid caching, preventing cache stampedes, and automated static file handling with MapStaticAssets. Overall, .NET 9 refines existing functionalities, boosting performance and developer experience. The update focuses on subtle yet impactful improvements rather than revolutionary changes.