Tag: Open Source

Blog Posts with tag "Open Source"

C# 15 Unions: Unions are finally in .NET
09 Mar 2026

C# 15 Unions: Unions are finally in .NET

By BEN ABT .NET C# .NET 11 Language Design Open Source 7 min reading time

After many years of workarounds, design discussions and library-level substitutes, unions are finally becoming a first-class part of C#. The proposal in the C# language repository is no longer a distant idea. With the feature now appearing in the .NET 11 preview train as an early C# 15 capability, the direction is concrete enough to discuss in practical terms.

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Unio: High-Performance Discriminated Unions for C#
02 Mar 2026

Unio: High-Performance Discriminated Unions for C#

By BEN ABT .NET C# Open Source Performance Design Patterns 19 min reading time

C# is a powerful language, but there is one road it has not yet fully paved: native discriminated union types. Developers have been working around this absence for years, typically choosing between throwing exceptions for non-exceptional paths, returning nullable values, using out parameters or layering custom wrapper classes on top of every service boundary. Each of these approaches carries a cost - in clarity, type safety or runtime efficiency.

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