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Date	Provider	Score	Summary
03 Sep 2026, 4:37 AM	The Register	6.0	Microsoft devs rejoice: Union types coming to C# in November C# 15, launching November 2026, introduces union types via a new `union` keyword that lets developers group disparate custom types into a single compiler-verified entity, enabling better pattern matching without wrapper classes or third-party libraries. The release also adds `closed` hierarchies that restrict which types can inherit from a base class, giving similar compile-time guarantees to inheritance chains. Why: If you maintain a C# codebase, plan to evaluate C# 15's union types as a replacement for hand-rolled Result/Either wrappers and discriminated union workarounds you may be using today—Torgersen and Campbell's demo showed a single switch expression replacing what previously needed error boilerplate or external libraries. The `closed` keyword also means you can now enforce sealed inheritance hierarchies at the compiler level, which affects how you design domain models going forward. csharp language-features type-systems

Date

Provider

Score

Summary

03 Sep 2026, 4:37 AM

The Register

6.0

Microsoft devs rejoice: Union types coming to C# in November

C# 15, launching November 2026, introduces union types via a new `union` keyword that lets developers group disparate custom types into a single compiler-verified entity, enabling better pattern matching without wrapper classes or third-party libraries. The release also adds `closed` hierarchies that restrict which types can inherit from a base class, giving similar compile-time guarantees to inheritance chains.

Why: If you maintain a C# codebase, plan to evaluate C# 15's union types as a replacement for hand-rolled Result/Either wrappers and discriminated union workarounds you may be using today—Torgersen and Campbell's demo showed a single switch expression replacing what previously needed error boilerplate or external libraries. The `closed` keyword also means you can now enforce sealed inheritance hierarchies at the compiler level, which affects how you design domain models going forward.