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C# 15 union types announcement graphic from the Microsoft .NET Blog

Open Source·3 weeks ago

C# is getting union types in version 15. The preview shipped in .NET 11 Preview 2.

Mads Torgersen's union proposal landed in .NET 11 Preview 2 on April 2. C# 15 targets November 2026 and replaces the OneOf library hack the .NET community has been living with.