Implict style for ContentPage not working

Description

Using implicit style with ContentPage as target type seems not to work.

This was an issue in Xamarin.Forms, too. See https://github.com/xamarin/Xamarin.Forms/issues/12350.

Steps to Reproduce

Add an implicit style in Styles.xaml targeting ContentPage. For example:

<Style TargetType="ContentPage">
        <Setter Property="BackgroundColor" Value="Red" />
        <Setter Property="Opacity" Value="0.5" />
</Style>

Expected outcome: all ContentPages should respect the style above. Actual outcome: The implicit style seems to be ignored.

Link to public reproduction project repository

https://github.com/Riccardo11/MarketGrowthStrategy

Version with bug

6.0.400

Last version that worked well

Unknown/Other

Affected platforms

iOS Android

Affected platform versions

iOS 16 Android 11

Did you find any workaround?

Adding ApplyToDerivedTypes="True" seems to solve the bug.

Relevant log output

No response

[riccardominato]

Thank you for your answer.

If this is the behavior by design, shouldn’t it be documented? I wasn’t able to find any hint about the solution I proposed inside Microsoft documentation, nor some explicit reference to ContentPage acting like this.

[riccardominato]

@oliver-ec it’s all about that ApplyToDerivedTypes="True". Check the workaround in the issue description.

The weird thing is that you have to specify that attribute even if you have to set a style specifically for ContentPage and you don’t care about derived types. Otherwise it doesn’t work.