Programmatically add an attribute to a method or parameter

Question

I can use TypeDescriptor.AddAttributes to add an attribute to a type in runtime. How do I do the same for a method and parameter? (maybe 2 separate questions...)

Answer 1

TypeDescriptor.AddAttributes only affects a very specific use-case; i.e. from within System.ComponentModel. For the rest of reflection, it knows nothing about the extra attribute. And indeed, System.ComponentModel doesn't really apply to methods or parameters.

So in short; you can't. You will need to store this information somewhere else (bespoke), or add it at compile-time.