.NET 5 & C# 9 - A look at what’s new

A presentation at DDD20 by Stuart Lang

.NET 5 & C# 9 — .NET 5 & C# 9
A look at what’s new

HELLO! — HELLO!
#DDD20 I am Stuart Lang You can find me at https://stu.dev

Agenda — Agenda
› .NET 5 › What is it › Support › What’s new
C# 9 › Top-level programs › Patterns › Records › Source Generators

What's .NET 5

What's .NET 5

Release Plan — Release Plan
https://blog.inedo.com/demystifying-net-lts

Consider Ecosystem Support

Porting to .NET 5 — Porting to .NET 5
try-convert: https://github.com/dotnet/try-convert

.NET Conf 2020 — .NET Conf 2020
.NET Conf 2020 https://www.youtube.com/playlist?list=PLdo4fOcmZ0oVWop1HEOml2OdqbDs6IlcI

.NET 5 Features — .NET 5 Features
› C# 9 › Performance ⚡ Link - https://devblogs.microsoft.com/dotnet/performance-improvements-in-net-5/ › Single file apps › App trimming › System.Text.Json new features › F# 5 › And more

C# 9

Top-level programs — Top-level programs
demo *

Patterns

Patterns - Switch Expressions

Patterns - Switch Expressions

Patterns - Switch Expressions

Patterns - Switch Expressions

Patterns - Examples

Patterns - Examples

Patterns - Examples

Records — Records
demo *

Source Generators

Source Generators — Source Generators
Program Code Source Generator Generated Output

Source Generators - Roslyn — Source Generators - Roslyn
Source code Syntax Tree Semantic Model Emit IL

Source Generators — Source Generators
demo *

THANKS! — THANKS!
Any questions? You can find me at: @stuartblang · stu.dev

Stuart Lang
@stuartlang

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.NET 5 marks an exciting milestone in the history of .NET. I’ll be talking about what this means for us, should you adopt it, and some of the benefits.

We’ll then go on a tour of some of the big new language features in C# 9 with some demos, and dig into how they work and when you might use them.