Open brennani opened 2 years ago
I see you're mentioning an older version of Xamarin.Forms, please check if this is still happening in the latest stable version.
Upgraded to Xamarin.Forms (5.0.0.2401) and Xamarin.Essentials (1.7.2) and still witnessing the issue. The older versions of Xamarin happened to be because that is what is deployed in the default project. I upgraded the project from the example and still witness it. My other projects were already at the current version and experience it.
I've added additional information to the stackoverflow post. Adding an additional DataTrigger
to cover the other boolean case seemingly causes the binding to get stuck after a bit, no longer updating. From my understanding, I should be able to have a default value in the original Title binding, and then a DataTrigger
for when my boolean is True and a DataTrigger
for when my boolean is False and they should be able to toggle between them, but it seems like the triggers may only fire so many times. Perhaps it's due to being a boolean value?
I've further added additional information regarding my testing the DataTrigger
with string values. It seems some of the evaluations may be off. In my example, the DataTrigger
below is being applied when the Text
is equal to multiple values that are not "test2"
(e.g. I tried "test3" and it applied the "test2" Setter
. Again, the stackoverflow post has additional screen captures to show what I mean.
<DataTrigger TargetType="ContentPage" Binding="{Binding Source={x:Reference testSwitchString}, Path=Text}" Value="test2">
<Setter Property="Title" Value="{Binding Title, StringFormat='{0} SWITCHED'}"/>
</DataTrigger>
Description
DataTrigger conditional StringFormat may be bugged for ContentPage or members it inherits.
See attached link for full explanation: https://stackoverflow.com/questions/71962796/how-to-set-the-contentpage-title-stringformat-through-boolean-binding-in-xamarin
Expected Behavior
The binding would conditionally apply a string format
Actual Behavior
The binding on the forms show an empty value
Basic Information
Environment
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See attached link: https://stackoverflow.com/questions/71962796/how-to-set-the-contentpage-title-stringformat-through-boolean-binding-in-xamarin
Reproduction Link
https://stackoverflow.com/questions/71962796/how-to-set-the-contentpage-title-stringformat-through-boolean-binding-in-xamarin
Workaround
Stated in attached link, reversing the condition trigger so that the default binding does not have the StringFormat gets it to work. (* Note, this works for the example, but there are other projects I have where changing the order does not resolve the issue) See the EDIT in the attached link: https://stackoverflow.com/questions/71962796/how-to-set-the-contentpage-title-stringformat-through-boolean-binding-in-xamarin