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We Are .NET0 Hot0 comments3 min read
C# 15 Collection Expression Arguments: What's New vs C# 12 and 13
C# 15 introduces collection expression arguments, letting developers pass constructor, factory, or builder arguments directly inside collection expression syntax using a leading with(...) element, such as [with(capacity: 100), 1, 2, 3]. This builds on C# 12's collection expressions ([...] and spread) and C# 13's expanded params collections, but focuses specifically on collection construction rather than method parameter shapes. Limitations include: with(...) must be the first element, arrays and spans are unsupported, dynamic arguments are disallowed, and with(...) arguments don't affect type inference or conversion. Normal overload resolution and ambiguity rules still apply for constructors and collection builders.
Source: https://laurentkempe.com/2026/09/26/csharp-15-collection-expression-arguments. 8 Sync News only summarizes and links out; content copyright belongs to the authors and original sources.
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