Steven Giesel • 2/12/2026

Collection Expression Arguments in C# 15 are "out"

This article details a specific new feature in the C# 15 preview: the ability to pass arguments, like initial capacity, when creating collections using collection expressions. It notes the syntax changed from a proposed 'args' keyword to using the existing 'with' operator, and provides a code example and a link to official Microsoft documentation.

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#syntax #c #With Operator