Property page default values are not correctly display about vsprojectsystem HOT 2 OPEN

Hi @pepone, apologies for the delay in responding here. We generally track issues related to this UI in the dotnet/project-system repo.

@tmeschter, do you have a sense of what's going on here? Would you expect values in ItemDefinitionGroups to be picked up? I don't think I've seen an example of a XAML DataSource having an ItemType before.

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The short answer is that we're in unexplored territory here. We didn't design the system with ItemDefinitionGroups in mind and we haven't tested this scenario.

The longer answer is that reading or writing property values in CPS is always done in some context (defined by the IProjectPropertiesContext type) that tells us where to look for those properties. The context can represent things like:

• Project-level properties in the .csproj file.
• Project-level properties in some other imported .props/.targets file
• ItemDefinitionGroup properties for some particular item type, as defined in some specific file
• Item properties for a specific item in a specific file
• Etc.

The Rule file makes it clear that you want to read and write properties to the "SliceCompile" ItemDefinitionGroup in the main project file. The problem is that the project properties UI always works in a context representing project-level properties in the main project file. So there's a mismatch here, and I'm not sure what the correct behavior should be.

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