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1 article

dotnet

C# Union Types: Migrating from OneOf in .NET 11 (2026 Guide)

C# 15 native union types just shipped in .NET 11 preview. Here is how they compare to the OneOf library, what migration actually looks like, and the boxing tradeoff to know about.

Jun 23, 2026·8 min read·Zeeshan Tofiq