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C# 9 - What's the cool stuff? - BASTA! Spring 2021
The document discusses new features in C# 9, highlighting advancements such as top-level statements, records, nullable reference types, and source generators. These features aim to reduce coding complexity, enhance performance, and improve developer productivity. The author, Christian Nagel, emphasizes the integration of these features for better development experiences and code management.
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C# 9 - What's the cool stuff? - BASTA! Spring 2021
- 1. C# 9 –What‘s the cool stuff? Christian Nagel https://csharp.christiannagel.com
- 2. Christian Nagel • Training •Coaching • Consulting • Development • Microsoft MVP • www.cninnovation.com • csharp.christiannagel.com • @christiannagel
- 3. Topics • C# 9Features • Less coding
- 4. C# 8 • Readonlymembers • Default interface methods • Pattern matching enhancements • Switch expressions • Property patterns • Tuple patterns • Positional patterns • Using declarations • Static local functions • Disposable ref structs • Nullable reference types • Asynchronous streams • Asynchronous disposable • Indices and ranges • Null-coalescing assignment • Unmanaged constructed types • Stackalloc in nested expressions • Enhancement of interpolated verbatim strings
- 5. C# 9 • Records •Init-only setters • Top-level statements • Covariant return types • Target-typed new expressions • Pattern matching enhancements • Static anonymous functions • Attributes on local functions • Extension GetEnumerator • Lambda discard parameters • Native sized integers • Function pointers • Module initializers • Extensions for partial methods • Source code generators
- 6. A new Hello,World!
- 7. Top-level Statements • Programclass, Main method created from compiler • Supports args • Supports await • Great for learning, interactive C# • Great for small applications & services • Extensions for Route to Code
- 8. Nullable Reference Types •Available since C# 8 • Adoption phase from C# 8 to .NET 5 • .NET is annotated! • Nullability still needs to be enabled (breaking changes)
- 9. Records • Nominal records •IEquality comparison & GetHashCode • Copy constructor & Clone method • with expressions • Positional records • Primary constructor – creates init-only set accessors • Deconstruction
- 10. Target-typed new expression •Book b = new Book(); • var b = new Book(); • Book b = new();
- 11. Source Generators • Injectcode, e.g. INotifyPropertyChanged • Different sources for code generation (e.g. PInvoke) • Reduce reflection • Invoked by the C# Compiler • Generated code can be used by the application • Enhanced partial keyword
- 12. Summary Top-level statements Records Nullable ReferenceTypes Increase productivity Get better performance
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