In particular:
- Use explicit types everywhere to improve clarity
- Use target-typed new() expression when target is explicit
- Use explicit discard for value-returning statements
See https://developercommunity.visualstudio.com/t/1568612.
We can consider reverting this once this has been fixed.
Used "dotnet" to be consistent with repo name. Using "NET", "dotNet" or variations would've just been wrong, so "dotnet" seemed like the best alternative.
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## Fixes#4225
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## PR Type
What kind of change does this PR introduce?
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- Bugfix
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## What is the current behavior?
Compilation fails If the Microsoft MVVM Toolkit source generator attribute `[ObservableProperty]` is in a `#region` block.
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## What is the new behavior?
The generated code is now correct when regions are used.
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## PR Checklist
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- [X] Tested code with current [supported SDKs](../#supported)
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