Dynamic Runtime Code with Roslyn

on YouTube ↗01h 01m

" summary

Roslyn compiles C# into assemblies at runtime so frameworks generate and compile C# into in-memory assemblies and load concrete types on demand; examples include Lamar/Jasper generating route handlers and Refit-style HTTP clients, and Utf8Json using this for fast JSON parsing. This replaces slow reflection and fragile IL or awkward expression trees, yielding reduced allocations and GC pressure and much faster hot paths, but with a real cold-start cost (originally cold start ~4–5s before warmup—now reduced, often mitigated by background compilation). Generated code is previewable and debuggable, improving stack traces.

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" chapters (21)

1. 0:00Introduction
2. 0:48About me
3. 1:30Tools
4. 2:09MVC Core
5. 4:50Reflection
6. 10:27Adapters
7. 12:33Hello World
8. 16:54Research
9. 18:39Lets get fancy
10. 20:25Refid
11. 21:43Demo
12. 24:39Lamar Compiler
13. 27:30Lamar Container
14. 30:35Darth Vader
15. 31:13Frameworks
16. 37:17Generation X
17. 38:36Fabu MVC
18. 40:27Behaviors
19. 45:22Jasper
20. 48:19Generated Code
21. 56:49HTTP Status Codes

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