.NET 5 & C# 9 - A look at what’s new

A presentation at DDD20 in December 2020 in by Stuart Lang

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.NET 5 & C# 9

A look at what’s new

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HELLO!

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

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Agenda

› .NET 5 › What is it › Support › What’s new

C# 9 › Top-level programs › Patterns › Records › Source Generators

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What's .NET 5

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What's .NET 5

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Release Plan

https://blog.inedo.com/demystifying-net-lts

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Consider Ecosystem Support

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Porting to .NET 5

try-convert: https://github.com/dotnet/try-convert

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.NET Conf 2020

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

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.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

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C# 9

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Top-level programs

demo *

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Patterns

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Patterns - Switch Expressions

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Patterns - Switch Expressions

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Patterns - Switch Expressions

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Patterns - Switch Expressions

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Patterns - Examples

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Patterns - Examples

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Patterns - Examples

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Records

demo *

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Source Generators

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Source Generators

Program Code Source Generator Generated Output

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Source Generators - Roslyn

Source code Syntax Tree Semantic Model Emit IL

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Source Generators

demo *

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THANKS!

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