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C# Feature - Params collections

Overview

Section titled “Overview”

Params collections extend params so APIs can accept more collection forms while keeping a natural call-site syntax.

Introduced In

Section titled “Introduced In”

C# 13.0 (2024)

Before

Section titled “Before”
public static void Log(params string[] items) { }

After

Section titled “After”
public static void Log(params ReadOnlySpan<string> items) { }

Annotated Example

Section titled “Annotated Example”
Log("info", "payments", "approved");

Gotchas & Best Practices

Section titled “Gotchas & Best Practices”
  • Use params collections for API design when spans or custom collection builders are a better fit than arrays.
  • Keep overloads unambiguous when mixing params and non-params signatures.
Section titled “Related Features”

Version Notes

Section titled “Version Notes”
  • C# 13 broadened params support beyond arrays.