.NET Conf 2020

.NET Conf 2020 is an online conference, mostly about all the good new stuff in .Net 5.

There are lots of good presentations, but I don’t have time to watch them all. These are the ones that appealed to me most.

KeyNote

top level program
init setter
- serializer still breaks “read-only-ness”, ie can set init properties
record
- class with value but no methods
- nice ToString implementation
- value equality
- define properties in constructor
- can be deconstruced (tuples)
- probably immutable
with expression - create (shallow) copy and have an extra object initialiser
better pattern matching in switch statements

.Net 5 is not LTS - 6 will be
Xamarin not in 5 - will be in 6
everything they intend to bring from FF is now in .Net 5
- AddDomains will not be ported, but can use AssemblyLoadContext instead
.Net 5 replaces Core and Standard
- also have platform specific versions that add stuff
- cross platform libraries to support FF are still Standard 2.0
- Standard 2.1 to share with Core 3.0 and Xamarin
only reason to port is to innovate - Core 3.1 and FF will stay around for ever
nice tools to migrate - ApiPort and try-convert

Pulumi has full coverage of Azure and Kubernetes APIs, and .Net 5 and C# 9
multiple cloud providers
infrastructure as code
- ARM templates
- yaml
- actual code
Pulumi is the last in that list
- has IDE support etc, and can also write unit tests etc
100% Azure coverage - it’s generated from the OpenApi spec
can convert an ARM template to code

it’s supposed to simplify Kubernetes
but if you don’t find Kubernetes too hard, then Tye is probably not useful for you
it’s still an experiment
- useful for development cycle
- most people don’t get as far as using it for deployment
the second half of the video was a demo, but they’d already lost me

themes - download a theme extension and select it - it’ll do colors, etc
checkbox to open solution without loading projects
configure file nesting options, eg show different file types as if they were in different folders
intellicode suggestion - suggest what to do next when it sees you’re repeating edits, and suggest to do it in other locations
demo didn’t go well - VS kept freezing

Roslyn is the C# compiler with an open API surface that let’s you plugin other technologies, one of which is code analysers
diagnostics, suggestions and code fixes
report violations: error, warning, suggestion, hidden
hidden is refactoring suggestions, eg extract method
style support for XML comments, also for inheritdoc
(new C# feature - default constructor when variable type is defined, eg List<int> list = new())
show parameter names when pressing alt-f - or always if configured
Regex completion
DateTime format suggestions
best practises
- they’ve been disabled for a long time to avoid breaking stuff, but now they’re enabling more
- project setting AnalysisLevel to revert to previous behavior, or use a later behavior
second half was about how to write a Roslyn analyser, which I’m not interested in

New team to create consistency in all the Azure SDKs
idiomatic, consistent, approachable, diagnosable, dependable
in depth description about how the SDK works internally
- not necessary to know for the simple use case
- but could be interesting for extending or diagnosing
pipeline is immutable, which means that a single client can be used by multiple threads

https://github.com/robrich/levelup-devops-github-actions-kubernetes
demo creating a project from scratch, dockerizing it (multi-stage, including using docker to build instead of local)
then deploy to k8s - copy-paste yaml because it’s always the same
Github Actions - build container (tag with sha), push to registry, apply to k8s (including replacing params in k8s yaml)
flawless and complete demo