SourceGen Sometimes Emits Spurious Warnings

[david-maw]

Description

Setting MauiXamlInflator to SourceGen in my project file got me a LOT of warnings, mainly a trio of "Obsolete" warnings for 'Device', 'NamedSize' and 'Device.GetNamedSize(NamedSize, Type)'. Seemingly wherever I used a named font size (mostly in XAML written before I knew how to use styles).

There were a couple of ithers that are probably just something I should investigate in my code, specifically:
warning CS8622: Nullability of reference types in type of parameter 'sender' of 'void PersonEditPage.OnCompleted(object sender, EventArgs e)' doesn't match the target delegate 'EventHandler' (possibly because of nullability attributes). and `warning CS0618: 'ListView' is obsolete: 'ListView is deprecated. Please use CollectionView instead.' the latter one is in a styles.xaml file and can probably just be deleted.

Steps to Reproduce

1. Clone the repository
2. Edit DivisiBill.csproj to add <MauiXamlInflator>SourceGen</MauiXamlInflator>
3. Run DivisiBill on Windows (that will build a debug/windows version)
4. The errors should show up in the build output.

What I saw was:

Build started at 4:10 PM...
1>------ Build started: Project: DivisiBill, Configuration: Debug Any CPU ------
1>  XAML source generation is enabled (MauiXamlInflator=SourceGen). This generates C# code from XAML at compile time for better performance. To disable, remove the MauiXamlInflator line from your .csproj file (reverts to configuration-based defaults: Runtime in Debug, XamlC in Release).
...XamlGenerator\Views_CheckWebPage.xaml.xsg.cs(181,74,181,112): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_CheckWebPage.xaml.xsg.cs(181,127,181,168): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_CheckWebPage.xaml.xsg.cs(181,74,181,218): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_CameraPage.xaml.xsg.cs(230,74,230,112): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_CameraPage.xaml.xsg.cs(230,127,230,168): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_CameraPage.xaml.xsg.cs(230,74,230,218): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_ProblemReportPage.xaml.xsg.cs(237,75,237,113): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_ProblemReportPage.xaml.xsg.cs(237,128,237,169): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_ProblemReportPage.xaml.xsg.cs(237,75,237,219): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_ProblemReportPage.xaml.xsg.cs(247,75,247,113): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_ProblemReportPage.xaml.xsg.cs(247,128,247,169): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_ProblemReportPage.xaml.xsg.cs(247,75,247,219): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_ImagePage.xaml.xsg.cs(337,74,337,112): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_ImagePage.xaml.xsg.cs(337,127,337,168): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_ImagePage.xaml.xsg.cs(337,74,337,218): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_ImagePage.xaml.xsg.cs(362,75,362,113): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_ImagePage.xaml.xsg.cs(362,128,362,169): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_ImagePage.xaml.xsg.cs(362,75,362,219): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_MapPage.xaml.xsg.cs(255,74,255,112): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_MapPage.xaml.xsg.cs(255,127,255,168): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_MapPage.xaml.xsg.cs(255,74,255,218): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_QuestionPage.xaml.xsg.cs(193,74,193,112): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_QuestionPage.xaml.xsg.cs(193,127,193,168): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_QuestionPage.xaml.xsg.cs(193,74,193,218): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_PersonEditPage.xaml.xsg.cs(237,74,237,112): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_PersonEditPage.xaml.xsg.cs(237,127,237,168): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_PersonEditPage.xaml.xsg.cs(237,74,237,218): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_PersonEditPage.xaml.xsg.cs(262,22,262,33): warning CS8622: Nullability of reference types in type of parameter 'sender' of 'void PersonEditPage.OnCompleted(object sender, EventArgs e)' doesn't match the target delegate 'EventHandler' (possibly because of nullability attributes).
...XamlGenerator\Views_PersonEditPage.xaml.xsg.cs(277,23,277,34): warning CS8622: Nullability of reference types in type of parameter 'sender' of 'void PersonEditPage.OnCompleted(object sender, EventArgs e)' doesn't match the target delegate 'EventHandler' (possibly because of nullability attributes).
...XamlGenerator\Views_PersonEditPage.xaml.xsg.cs(292,23,292,34): warning CS8622: Nullability of reference types in type of parameter 'sender' of 'void PersonEditPage.OnCompleted(object sender, EventArgs e)' doesn't match the target delegate 'EventHandler' (possibly because of nullability attributes).
...XamlGenerator\Views_PersonEditPage.xaml.xsg.cs(312,23,312,34): warning CS8622: Nullability of reference types in type of parameter 'sender' of 'void PersonEditPage.OnCompleted(object sender, EventArgs e)' doesn't match the target delegate 'EventHandler' (possibly because of nullability attributes).
...XamlGenerator\Views_PersonEditPage.xaml.xsg.cs(327,23,327,34): warning CS8622: Nullability of reference types in type of parameter 'sender' of 'void PersonEditPage.OnCompleted(object sender, EventArgs e)' doesn't match the target delegate 'EventHandler' (possibly because of nullability attributes).
...XamlGenerator\Views_ScanPage.xaml.xsg.cs(181,74,181,112): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_ScanPage.xaml.xsg.cs(181,127,181,168): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_ScanPage.xaml.xsg.cs(181,74,181,218): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_ScanPage.xaml.xsg.cs(240,76,240,114): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_ScanPage.xaml.xsg.cs(240,129,240,170): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_ScanPage.xaml.xsg.cs(240,76,240,220): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_ScanPage.xaml.xsg.cs(251,76,251,114): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_ScanPage.xaml.xsg.cs(251,129,251,170): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_ScanPage.xaml.xsg.cs(251,76,251,220): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_RestorePage.xaml.xsg.cs(186,74,186,112): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_RestorePage.xaml.xsg.cs(186,127,186,168): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_RestorePage.xaml.xsg.cs(186,74,186,218): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_SplashPage.xaml.xsg.cs(205,74,205,112): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_SplashPage.xaml.xsg.cs(205,127,205,168): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_SplashPage.xaml.xsg.cs(205,74,205,218): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(328,74,328,112): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(328,127,328,168): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(328,74,328,218): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(339,75,339,113): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(339,128,339,169): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(339,75,339,219): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(366,75,366,113): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(366,128,366,169): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(366,75,366,219): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(380,75,380,113): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(380,128,380,169): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(380,75,380,219): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(389,75,389,113): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(389,128,389,169): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(389,75,389,219): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(398,75,398,113): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(398,128,398,169): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(398,75,398,219): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(407,75,407,113): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(407,128,407,169): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(407,75,407,219): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(421,75,421,113): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(421,128,421,169): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(421,75,421,219): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(548,72,548,110): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(548,125,548,166): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(548,72,548,215): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(555,73,555,111): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(555,126,555,167): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(555,73,555,216): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(560,73,560,111): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(560,126,560,167): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(560,73,560,216): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(567,73,567,111): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(567,126,567,167): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(567,73,567,216): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(582,76,582,114): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(582,129,582,170): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(582,76,582,220): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(587,76,587,114): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(587,129,587,170): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(587,76,587,220): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(635,77,635,115): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(635,130,635,171): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(635,77,635,221): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(646,77,646,115): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(646,130,646,171): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_MealSummaryPage.xaml.xsg.cs(646,77,646,221): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_PaymentsPage.xaml.xsg.cs(279,136,279,174): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_PaymentsPage.xaml.xsg.cs(279,189,279,230): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_PaymentsPage.xaml.xsg.cs(279,136,279,280): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_PaymentsPage.xaml.xsg.cs(355,74,355,112): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_PaymentsPage.xaml.xsg.cs(355,127,355,168): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_PaymentsPage.xaml.xsg.cs(355,74,355,218): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_PaymentsPage.xaml.xsg.cs(377,75,377,113): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_PaymentsPage.xaml.xsg.cs(377,128,377,169): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_PaymentsPage.xaml.xsg.cs(377,75,377,219): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_PaymentsPage.xaml.xsg.cs(393,75,393,113): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_PaymentsPage.xaml.xsg.cs(393,128,393,169): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_PaymentsPage.xaml.xsg.cs(393,75,393,219): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_PaymentsPage.xaml.xsg.cs(409,75,409,113): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_PaymentsPage.xaml.xsg.cs(409,128,409,169): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_PaymentsPage.xaml.xsg.cs(409,75,409,219): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_VenueEditPage.xaml.xsg.cs(251,74,251,112): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_VenueEditPage.xaml.xsg.cs(251,127,251,168): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_VenueEditPage.xaml.xsg.cs(251,74,251,218): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_PeopleListPage.xaml.xsg.cs(865,74,865,112): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_PeopleListPage.xaml.xsg.cs(865,127,865,168): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_PeopleListPage.xaml.xsg.cs(865,74,865,218): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_PeopleListPage.xaml.xsg.cs(869,75,869,113): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_PeopleListPage.xaml.xsg.cs(869,128,869,169): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_PeopleListPage.xaml.xsg.cs(869,75,869,219): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_PeopleListPage.xaml.xsg.cs(873,75,873,113): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_PeopleListPage.xaml.xsg.cs(873,128,873,169): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_PeopleListPage.xaml.xsg.cs(873,75,873,219): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_VenueListPage.xaml.xsg.cs(523,76,523,114): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_VenueListPage.xaml.xsg.cs(523,129,523,170): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_VenueListPage.xaml.xsg.cs(523,76,523,220): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_VenueListPage.xaml.xsg.cs(577,76,577,114): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_VenueListPage.xaml.xsg.cs(577,129,577,170): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_VenueListPage.xaml.xsg.cs(577,76,577,220): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_VenueListPage.xaml.xsg.cs(781,74,781,112): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_VenueListPage.xaml.xsg.cs(781,127,781,168): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_VenueListPage.xaml.xsg.cs(781,74,781,218): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_VenueListPage.xaml.xsg.cs(905,75,905,113): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_VenueListPage.xaml.xsg.cs(905,128,905,169): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_VenueListPage.xaml.xsg.cs(905,75,905,219): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_VenueListPage.xaml.xsg.cs(909,75,909,113): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_VenueListPage.xaml.xsg.cs(909,128,909,169): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_VenueListPage.xaml.xsg.cs(909,75,909,219): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_VenueListPage.xaml.xsg.cs(913,75,913,113): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_VenueListPage.xaml.xsg.cs(913,128,913,169): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_VenueListPage.xaml.xsg.cs(913,75,913,219): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_VenueListPage.xaml.xsg.cs(456,25,456,49): warning CS8622: Nullability of reference types in type of parameter 'sender' of 'void VenueListPage.OnAssignSwipeItemInvoked(object sender, EventArgs e)' doesn't match the target delegate 'EventHandler<EventArgs>' (possibly because of nullability attributes).
...XamlGenerator\Views_VenueListPage.xaml.xsg.cs(489,26,489,50): warning CS8622: Nullability of reference types in type of parameter 'sender' of 'void VenueListPage.OnDeleteSwipeItemInvoked(object sender, EventArgs e)' doesn't match the target delegate 'EventHandler<EventArgs>' (possibly because of nullability attributes).
...XamlGenerator\Views_VenueListPage.xaml.xsg.cs(742,27,742,36): warning CS8622: Nullability of reference types in type of parameter 'sender' of 'void VenueListPage.OnShowMap(object sender, EventArgs e)' doesn't match the target delegate 'EventHandler' (possibly because of nullability attributes).
...XamlGenerator\Views_VenueListPage.xaml.xsg.cs(761,30,761,54): warning CS8622: Nullability of reference types in type of parameter 'sender' of 'void VenueListPage.OnCollectionViewScrolled(object sender, ItemsViewScrolledEventArgs e)' doesn't match the target delegate 'EventHandler<ItemsViewScrolledEventArgs>' (possibly because of nullability attributes).
...XamlGenerator\Views_DataManagementPage.xaml.xsg.cs(433,74,433,112): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_DataManagementPage.xaml.xsg.cs(433,127,433,168): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_DataManagementPage.xaml.xsg.cs(433,74,433,218): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_DataManagementPage.xaml.xsg.cs(707,75,707,113): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_DataManagementPage.xaml.xsg.cs(707,128,707,169): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_DataManagementPage.xaml.xsg.cs(707,75,707,219): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_DataManagementPage.xaml.xsg.cs(773,76,773,114): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_DataManagementPage.xaml.xsg.cs(773,129,773,170): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_DataManagementPage.xaml.xsg.cs(773,76,773,220): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_DataManagementPage.xaml.xsg.cs(798,76,798,114): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_DataManagementPage.xaml.xsg.cs(798,129,798,170): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_DataManagementPage.xaml.xsg.cs(798,76,798,220): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_FileListPage.xaml.xsg.cs(915,76,915,114): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_FileListPage.xaml.xsg.cs(915,129,915,170): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_FileListPage.xaml.xsg.cs(915,76,915,220): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_FileListPage.xaml.xsg.cs(924,76,924,114): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_FileListPage.xaml.xsg.cs(924,129,924,170): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_FileListPage.xaml.xsg.cs(924,76,924,220): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_FileListPage.xaml.xsg.cs(934,76,934,114): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_FileListPage.xaml.xsg.cs(934,129,934,170): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_FileListPage.xaml.xsg.cs(934,76,934,220): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_FileListPage.xaml.xsg.cs(1066,74,1066,112): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_FileListPage.xaml.xsg.cs(1066,127,1066,168): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_FileListPage.xaml.xsg.cs(1066,74,1066,218): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_FileListPage.xaml.xsg.cs(1081,75,1081,113): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_FileListPage.xaml.xsg.cs(1081,128,1081,169): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_FileListPage.xaml.xsg.cs(1081,75,1081,219): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_FileListPage.xaml.xsg.cs(1115,75,1115,113): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_FileListPage.xaml.xsg.cs(1115,128,1115,169): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_FileListPage.xaml.xsg.cs(1115,75,1115,219): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_SettingsPage.xaml.xsg.cs(873,75,873,113): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_SettingsPage.xaml.xsg.cs(873,128,873,169): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_SettingsPage.xaml.xsg.cs(873,75,873,219): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_SettingsPage.xaml.xsg.cs(2046,76,2046,114): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_SettingsPage.xaml.xsg.cs(2046,129,2046,170): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_SettingsPage.xaml.xsg.cs(2046,76,2046,220): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_SettingsPage.xaml.xsg.cs(2050,76,2050,114): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_SettingsPage.xaml.xsg.cs(2050,129,2050,170): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_SettingsPage.xaml.xsg.cs(2050,76,2050,220): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_SettingsPage.xaml.xsg.cs(2054,76,2054,114): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_SettingsPage.xaml.xsg.cs(2054,129,2054,170): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_SettingsPage.xaml.xsg.cs(2054,76,2054,220): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_SettingsPage.xaml.xsg.cs(2062,76,2062,114): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_SettingsPage.xaml.xsg.cs(2062,129,2062,170): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_SettingsPage.xaml.xsg.cs(2062,76,2062,220): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_SettingsPage.xaml.xsg.cs(2115,76,2115,114): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_SettingsPage.xaml.xsg.cs(2115,129,2115,170): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_SettingsPage.xaml.xsg.cs(2115,76,2115,221): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_TotalsPage.xaml.xsg.cs(1374,74,1374,112): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_TotalsPage.xaml.xsg.cs(1374,127,1374,168): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_TotalsPage.xaml.xsg.cs(1374,74,1374,218): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_TotalsPage.xaml.xsg.cs(1389,75,1389,113): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_TotalsPage.xaml.xsg.cs(1389,128,1389,169): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_TotalsPage.xaml.xsg.cs(1389,75,1389,219): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_PropertiesPage.xaml.xsg.cs(710,135,710,173): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_PropertiesPage.xaml.xsg.cs(710,188,710,229): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_PropertiesPage.xaml.xsg.cs(710,135,710,279): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_PropertiesPage.xaml.xsg.cs(717,136,717,174): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_PropertiesPage.xaml.xsg.cs(717,189,717,230): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_PropertiesPage.xaml.xsg.cs(717,136,717,280): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_PropertiesPage.xaml.xsg.cs(725,136,725,174): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_PropertiesPage.xaml.xsg.cs(725,189,725,230): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_PropertiesPage.xaml.xsg.cs(725,136,725,280): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_PropertiesPage.xaml.xsg.cs(753,74,753,112): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_PropertiesPage.xaml.xsg.cs(753,127,753,168): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_PropertiesPage.xaml.xsg.cs(753,74,753,218): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_PropertiesPage.xaml.xsg.cs(780,75,780,113): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_PropertiesPage.xaml.xsg.cs(780,128,780,169): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_PropertiesPage.xaml.xsg.cs(780,75,780,219): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_PropertiesPage.xaml.xsg.cs(789,75,789,113): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_PropertiesPage.xaml.xsg.cs(789,128,789,169): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_PropertiesPage.xaml.xsg.cs(789,75,789,219): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_PropertiesPage.xaml.xsg.cs(839,75,839,113): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_PropertiesPage.xaml.xsg.cs(839,128,839,169): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_PropertiesPage.xaml.xsg.cs(839,75,839,219): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_PropertiesPage.xaml.xsg.cs(853,75,853,113): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_PropertiesPage.xaml.xsg.cs(853,128,853,169): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_PropertiesPage.xaml.xsg.cs(853,75,853,219): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_PropertiesPage.xaml.xsg.cs(862,75,862,113): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_PropertiesPage.xaml.xsg.cs(862,128,862,169): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_PropertiesPage.xaml.xsg.cs(862,75,862,219): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_PropertiesPage.xaml.xsg.cs(871,75,871,113): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_PropertiesPage.xaml.xsg.cs(871,128,871,169): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_PropertiesPage.xaml.xsg.cs(871,75,871,219): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_LineItemsPage.xaml.xsg.cs(1697,74,1697,112): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_LineItemsPage.xaml.xsg.cs(1697,127,1697,168): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_LineItemsPage.xaml.xsg.cs(1697,74,1697,218): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_LineItemsPage.xaml.xsg.cs(1706,75,1706,113): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_LineItemsPage.xaml.xsg.cs(1706,128,1706,169): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_LineItemsPage.xaml.xsg.cs(1706,75,1706,219): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_MealListPage.xaml.xsg.cs(1015,76,1015,114): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_MealListPage.xaml.xsg.cs(1015,129,1015,170): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_MealListPage.xaml.xsg.cs(1015,76,1015,220): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_MealListPage.xaml.xsg.cs(1093,76,1093,114): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_MealListPage.xaml.xsg.cs(1093,129,1093,170): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_MealListPage.xaml.xsg.cs(1093,76,1093,220): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_MealListPage.xaml.xsg.cs(1123,76,1123,114): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_MealListPage.xaml.xsg.cs(1123,129,1123,170): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_MealListPage.xaml.xsg.cs(1123,76,1123,220): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_MealListPage.xaml.xsg.cs(1771,74,1771,112): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_MealListPage.xaml.xsg.cs(1771,127,1771,168): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_MealListPage.xaml.xsg.cs(1771,74,1771,218): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_MealListPage.xaml.xsg.cs(1803,75,1803,113): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_MealListPage.xaml.xsg.cs(1803,128,1803,169): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_MealListPage.xaml.xsg.cs(1803,75,1803,219): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_MealListPage.xaml.xsg.cs(2276,76,2276,114): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_MealListPage.xaml.xsg.cs(2276,129,2276,170): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_MealListPage.xaml.xsg.cs(2276,76,2276,220): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_MealListPage.xaml.xsg.cs(2283,76,2283,114): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_MealListPage.xaml.xsg.cs(2283,129,2283,170): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_MealListPage.xaml.xsg.cs(2283,76,2283,220): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_MealListPage.xaml.xsg.cs(2319,77,2319,115): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_MealListPage.xaml.xsg.cs(2319,130,2319,171): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_MealListPage.xaml.xsg.cs(2319,77,2319,221): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_MealListPage.xaml.xsg.cs(2346,77,2346,115): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_MealListPage.xaml.xsg.cs(2346,130,2346,171): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_MealListPage.xaml.xsg.cs(2346,77,2346,221): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Views_MealListPage.xaml.xsg.cs(2650,75,2650,113): warning CS0612: 'Device' is obsolete
...XamlGenerator\Views_MealListPage.xaml.xsg.cs(2650,128,2650,169): warning CS0612: 'NamedSize' is obsolete
...XamlGenerator\Views_MealListPage.xaml.xsg.cs(2650,75,2650,219): warning CS0612: 'Device.GetNamedSize(NamedSize, Type)' is obsolete
...XamlGenerator\Resources_Styles_Styles.xaml.xsg.cs(323,66,323,106): warning CS0618: 'ListView' is obsolete: 'ListView is deprecated. Please use CollectionView instead.'
...XamlGenerator\Resources_Styles_Styles.xaml.xsg.cs(2912,23,2912,63): warning CS0618: 'ListView' is obsolete: 'ListView is deprecated. Please use CollectionView instead.'
...XamlGenerator\Resources_Styles_Styles.xaml.xsg.cs(2966,74,2966,114): warning CS0618: 'ListView' is obsolete: 'ListView is deprecated. Please use CollectionView instead.'
...XamlGenerator\Resources_Styles_Styles.xaml.xsg.cs(2970,23,2970,63): warning CS0618: 'ListView' is obsolete: 'ListView is deprecated. Please use CollectionView instead.'
...XamlGenerator\Resources_Styles_Styles.xaml.xsg.cs(3024,74,3024,114): warning CS0618: 'ListView' is obsolete: 'ListView is deprecated. Please use CollectionView instead.'
1>  DivisiBill Debug build for net10.0-windows10.0.19041.0, Web Service URI = https://pheasant-mature-coyote.ngrok-free.app/api/
1>  DivisiBill -> H:\Develop\Phone\DivisiBill\DivisiBill\bin\Debug\net10.0-windows10.0.19041.0\win-x64\DivisiBill.dll
========== Build: 1 succeeded, 0 failed, 0 up-to-date, 0 skipped ==========
========== Build completed at 4:10 PM and took 11.724 seconds ==========

Link to public reproduction project repository

https://github.com/david-maw/DivisiBill.git

Version with bug

Unknown/Other

Is this a regression from previous behavior?

Not sure, did not test other versions

Last version that worked well

No response

Affected platforms

Windows, Android, I was not able test on other platforms

Affected platform versions

All

Did you find any workaround?

No

Relevant log output

[MihuBot]

I'm a bot. Here are possible related and/or duplicate issues (I may be wrong):

• [.NET 10] Xaml Source Gen - Obsolete methods used in source generator #32681
• [NET 10] Xaml Source Gen - Generating warning CS0612 #32523

[StephaneDelcroix]

hi @david-maw, XamlSourceGen is more strict than the 2 others inflators:

• it complains about obsolete usages (while XamlC was only complaining when you tried to assign to obsolete properties)
• it's is more strict about nullable signatures (eventhandlers)

you can, but should not, ignore the warnings in generated code by setting 0612;0618 (or on specific Items using

for eventhandlers, it looks like you enabled nullable on your project but never updated the handler signature to match the delegate https://learn.microsoft.com/en-us/dotnet/api/system.eventhandler?view=net-9.0. please do it

As there's nothing spurious here, and I believe it works as expected, I'm going to close the issue

[david-maw]

Thanks @StephaneDelcroix, the nullable signatures thing and the use of ListView were trivial to fix, I reached the same conclusions you did. I'm actually ploughing through an old project adding #nullable enable as I go, but it's not a high priority task and this is just one more issue to look out for. So the project isn't nullable enabled (yet), just selected files.

I wasn't aware that named font sizes were obsolete - is that documented somewhere? The documentation here under "Display font icons" it says of Size that "...In addition, this property can be set to a named font size...." Not that I greatly object to the elimination of named font sizes, it should be fairly simple to go through the code and eliminate them, it's just that:

• I couldn't find the documentation that said named font sizes were obsolete
• I hadn't seen any previous warnings (certainly understandable if they are newly obsolete)
• IntelliSense in Visual Studio still suggests named sizes (and doesn't suggest an integer)
• The reported warnings do not say what the actual problem is (named font sizes)
• Three warnings are generated for every use of a named font size

If you have some documentation to point me to, I'll report the IntelliSense problem to the VS team. That and the fact that automatically generated event handlers in a nullable context should use object? sender as the first parameter, not just plain object sender, again I assume that's a VS problem not a MAUI one.

Interestingly, in my search for documentation I even asked Copilot "are named font sizes obsolete in .net maui XAML" and got the answer "Named font sizes in .NET MAUI aren’t obsolete at all — but they have shifted from being a primary sizing mechanism (like in Xamarin.Forms) to more of a convenience layer. The modern MAUI layout system and responsive patterns make them less central, but they’re still fully supported and intentionally kept for consistency, accessibility, and cross‑platform parity." Of course, answers from Copilot are grammatically correct nonsense some of the time so I'm very much in the "trust but verify" camp.

[david-maw]

Also, for anyone contemplating changing from named sizes in Android (which is my primary target), this reference to sizes might come in handy, thanks to @IeuanWalker and issue #32681:
https://github.com/dotnet/maui/blob/main/src/Controls/src/Core/Compatibility/Android/FontNamedSizeService.cs

[StephaneDelcroix]

four years ago #5088

[david-maw]

OK, the pull request shows the intent was there, but what propagates the outcome of a pull request to public documentation (not that the pull request is private, just a bit hard to find)? Whatever mechanism does that seems to have gone astray. Still, I suspect the PR alone is enough for me to refer to when talking to the VS team, so thanks for that.

Should I report the documentation errors separately? If so, do you have any idea where?

That said, it seems like a simpler user experience to just emit a warning on the use of FontSize literals in Label objects rather than having the user figure out that's the root cause of the warnings. Should I just submit a feature request for that?

[StephaneDelcroix]

I'm only saying it's not new. The doc is lagging behind, we will look at it. @jfversluis ?

[IeuanWalker]

@david-maw just a warning, the numbers in the switch statement/ default value arnt 100% correct as it runs though the ConvertTextAppearanceToSize method, which returns a different number.

I pulled maui down locally to debug that code to get the actual values after the testers complained they were too small, here is the actual number (for android not sure if iOS is different)

[david-maw]

Point taken @StephaneDelcroix, it's pretty clear from reading pull request #5088 that the implementation no longer met its intent (if it ever did). My point was just that the obsolescence of named FontSize values was never made public. What I'd have expected was:

1. A warning whenever XAML using a named FontSize was compiled
2. An update to Visual Studio so it no longer suggested the use of named FontSize value
3. A documentation update, at least to remove all mention of named FontSize values and ideally to mention that they used to be used and no longer should be.
4. Some sort of release documentation announcing the obsolescence.

I'm not sure I'm in a position to help with any of these, but if I am certainly willing if there's something I can do.

Aside from this minor issue I must say I'm delighted with this feature, not only is it more responsive, but it works to allow XAML hot reload to work with a DataTemplate inside a CollectionView, something that never worked before (for me anyway). Thanks for the good work.

[david-maw]

Thanks @IeuanWalker I put those values in a ResourceDictionary for convenience, so for anyone who wants them (edit: I forgot FontSize was a Double not integer values, so I made the declarations below Double so as to work with VS IntelliSense):

            <!-- Font sizes -->
            <x:Double x:Key="FontSizeMicro">   10</x:Double>
            <x:Double x:Key="FontSizeSmall">   14</x:Double>
            <x:Double x:Key="FontSizeMedium">  18</x:Double>
            <x:Double x:Key="FontSizeLarge">   22</x:Double>
            <x:Double x:Key="FontSizeBody">    16</x:Double>
            <x:Double x:Key="FontSizeCaption"> 12</x:Double>
            <x:Double x:Key="FontSizeHeader">  14</x:Double>
            <x:Double x:Key="FontSizeSubtitle">16</x:Double>
            <x:Double x:Key="FontSizeTitle">   24</x:Double>