How to inherit from BaseConverter in MAUI 9?

[Ghostbird]

I upgraded CommunityToolkit.Maui in my MAUI 9 app. However, now my custom converters no longer build:

public class NumberEntryConverter() : BaseConverter<double?, string?>

'BaseConverter<double?, string?>.BaseConverter()' is inaccessible due to its protection level

I saw that in the new version the public abstract BaseConverter has a private protected constructor. Does this mean we're not meant to use the BaseConverter any more? Or did I miss something obvious?

I guess, I can write my own implementation of IValueConverter instead, but the big advantage of BaseConverter<TFrom,‌ TTo to me was that it provided better type safety, and reduced boilerplate.

[Ghostbird]

Ah, I found it.

From #2215's breaking changes

Remove ability to subclass BaseConverter<TFrom, TTo>

Subclassing from BaseConverter<TFrom, TTo> is not supported
Support requires documentation and complete unit tests

Remove ability to subclass BaseConverter<TFrom, TTo, TParam>

Subclassing from BaseConverter<TFrom, TTo, TParam> is not supported
Support requires documentation and complete unit tests

So the removal was obviously intended. Is there a specific reason for it?‌

It feels kind of annoying and pointless. I (and probably every MAUI developer out there) needs to write IValueConverters and have type safety. Now we're forced to write exactly the same code ourselves, or copy your code, or copy a similar implementation from elsewhere. I thought it was dead practical that the CommunityToolkit provided it.

[TheCodeTraveler]

CommunityToolkit.Maui v11.2.0 will allow developers to insert from BaseConverter and BaseBehavior: #2573