C# 14, in its preview phase with .NET 10 Preview 3, introduces extension members, which allow adding methods, properties, and static features to existing types without modifying them. The update brings a new optional syntax for extension members, enhancing developers' capabilities, especially when access to a type's source code is limited. This release aims to make extension features more versatile and consistent with previously existing methods, with a full release expected in November 2025.
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