Conditional compilation for Nullable ref types

[andrueastman]

Closes #2073

[baywet]

Thanks for starting the work here, great work so far. A couple of remarks to help you through the process:
Would additional data properties need any annotation?
Same thing for complex types properties (single value of other types being generated)?
Did you start the work on the kiota dependencies? I'm not sure what the impact would be on interfaces since their prototype would change?
I think the methods return types (when tasks of something) are still missing.

[andrueastman]

Thanks for checking this out @baywet,

Would additional data properties need any annotation?

I believe we are okay with these as they are initialized in the constructor with default non-null values meaning they won't be null.

Same thing for complex types properties (single value of other types being generated)?

I believe this is catered for example https://github.com/microsoft/kiota-samples/blob/4855fb63973b0ae20b602245bab902517694a686/msgraph-mail/dotnet/Models/Message.cs#L22

Did you start the work on the kiota dependencies? I'm not sure what the impact would be on interfaces since their prototype would change? I think the methods return types (when tasks of something) are still missing.

This is still WIP(Added as TODOs in the description to make clearer). I was first trying to get to understand what types would really need the annotations in the generated code as we already generate a bit of error handling code and initializers that assure some types won't be null and therefore would not need annotations.

[sonarqubecloud]

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