Let’s catch up with C#! Exciting new features in C# 9, 10, 11 and 12! - Filip Ekberg

New C# features focus on improving performance, reducing allocations and making code more concise while maintaining readability

Primary constructors introduced in C# 12 allow declaring constructor parameters directly in the class declaration, reducing boilerplate code for data classes

Pattern matching enhancements across C# 9-12 provide more expressive ways to examine data and control flow, including list patterns, relational patterns and span patterns

Collection expressions and spread operators simplify working with arrays and collections while reducing memory allocations

Nullable reference types help catch potential null reference exceptions at compile time by adding static analysis

Record types introduced in C# 9 provide concise syntax for immutable data classes with value-based equality

UTF-8 string literals optimize string handling for web scenarios by avoiding UTF-16 conversions

Raw string literals (using “””) improve multiline string formatting for JSON, XML and SQL

Required properties ensure initialization of critical fields at object creation time

File-scoped namespaces and global using directives reduce code verbosity and improve organization