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CSharp9

readme.md

Storyboard

  • Create new empty ASP.NET 5 Web API CSharp9Demo
    • With HTTPS
    • With Docker
  • Remove IIS Express launch settings
  • Add analysis level preview for code quality

Top-Level Statements

Talk about top-level statements

Attributes on Local Functions

  • Add DummyAuthentication.cs with Snippet 0020 DummyAuthenticationHandler
  • Add auth to DI with Snippet 0030 Authentication DI
  • Add app.UseAuthentication(); and app.UseAuthorization(); after UseRouting
  • Replace MapGet with Snippet 0040 Secure Health

Talk about attributes on local functions

Records

  • Add Repository.cs
  • Add base code with Snippet 0050 Repository Starter
  • Add basic record with Snippet 0060 Person Record
  • Add derived records with Snippet 0070 Derived Records

Talk about records in general (immutability)

  • Add member to record Person with Snippet 0080 Record Member

Talk about the fact that records are just classes

  • Add init-only property to record Hero with Snippet 0090 Init-only Props

Talk about init-only properties

Target-typed new

  • Add base repository code with Snippet 0100 Base Repository
  • Add initialization for heroes with Snippet 0110 Hero Initialize

Discuss advantages/disadvantages of target-typed new

Relational Patterns

  • Add LINQ query with relational pattern to record HeroRepository with Snippet 0120 Relational Pattern

Talk about relational patterns

  • Add switch with relational pattern to Hero with Snippet 0130 Switch with Relational Pattern
  • Add recursive relational pattern to HeroRepository with Snippet 0140 Recursive Relational Pattern

Back to Records

  • Create API Controller HeroController
  • Add DTOs to HeroController with Snippet 0150 DTOs

Discuss attributes on init-only props

  • Add HeroRepository to DI: services.AddSingleton<HeroRepository>();
  • Add repository to constructor for DI (HeroRepository repository)
  • Add a method for getting all heroes with Snippet 0160 Get all heroes

Repeat pattern matching with records

  • Add AutoMapper.Extensions.Microsoft.DependencyInjection NuGet package
  • Add AutoMapper to DI with Snippet 0170 Automapper setup
  • Add method for getting all heroes (short version) with Snippet 0180 Get all heroes (short)

Discuss why AutoMapper just works (record = class)