C# 13 introduces params collections!

2026-01-02 16:11

Until now, params was limited to arrays:

void Print(params string[] values) { foreach (var v in values) Console.WriteLine(v); }

Print("A", "B", "C");

Now in C# 13, you can use params with other collection types like List<T> or even Span<T>:

void Print(params List<string> values) { foreach (var v in values) Console.WriteLine(v); }

Print("A", "B", "C");

✨ This makes APIs more expressive and eliminates unnecessary array conversions.

👉 Where would you use params collections in your projects?

#csharp #dotnet #developerexperience #cleanCode