C# 9.0

Highlights

• Records: Immutable reference types with value-based equality
• Init-only setters: set; init; for object initializers
• With-expressions: p with { Name = “New” }
• Top-level statements: Simplified Program.cs
• Pattern matching enhancements: relational and logical patterns
• Target-typed new: new() with inferred type
• Native sized integers: nint, nuint
• Covariant returns