A while back I wrote a blog post about deserializing a JSON with a field of a variable type in .NET. At that time I used a custom serializer to achieve that. This scenario seems like a good fit for un...

Since a new version of .NET is being released every autumn, C# has also adopted the same cadence. So, this November C# 15 is going to be released alongside with .NET 11. In this talk, we will take a l...

Last year, extension members were the biggest new feature of C# 14. I wrote about them in detail in multiple blogposts. This year, extension indexers are being added to C# 15 which didn't make it into...

In the previous blog post I explored what union types bring to C#. But what does the compiler do under the hood? And do I need to know about that to fully take advantage of union types?

The release of C# 15 is getting closer and its new features started to show up in the .NET 11 previews. That's a good time for me to take a closer look at what to expect. I'm starting with closed clas...

Goto statements have been a part of C# since the very first version, but at least I haven't seen them being used very often. In C# 15, labels can also be used in combination with continue and break st...

Collection expressions were introduced in C# 12. I wrote a blog post about them at that time. In C# 15, the syntax is being extended with the ability to provide additional arguments to the underlying ...

Mature programming languages rarely receive a foundational structure the community has anticipated for years. Microsoft recently released the highly anticipated C# 15 preview version. This release officially introduces union types, strictly closed hierarchies, and revised protocols for managing unsafe code. The company schedules the official launch for November 2026, coinciding directly with the .NET 11 release. The Power of Union Types…

Union Types in C# 15.0 erklärt: Syntax, Pattern Matching, Voraussetzungen und Praxisbeispiel für Discriminated Unions.

Continuing with the topic of switch expression exhaustiveness in C# 15, I chose union types as the next new language feature to explore.