As announced the most notable improvements include collection expressions, primary constructors for all classes and structs, syntax to alias any type, and default parameters for lambda expressions.
C# 12 introduces the extension of primary constructors to include this feature in all classes and structs, not limited to records only. This enhancement allows the definition of constructor parameters directly within the class declaration.
Collection expressions are also introduced, which simplifies the syntax for creating various collections, providing a unified approach. As stated, this eliminates the need for distinct syntax when initializing arrays, lists, or spans. The compiler generates efficient code, optimizing collection capacity and avoiding unnecessary data copying.
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