Best way to update bindings that use x:reference as command parameters

[Axemasta]

I've been upgrading my app to .NET 9 and I'm going through updating any of the xaml compile warnings that have appeared in my project.

I have the following scenario that I'm unsure on the best way to upgrade after reading the docs I'm not sure I understand how I need to change my xaml...

Xaml:

<controls:SelectableEntryHierarchyView
    Entries="{Binding Entries}"
    x:Name="EntryHierarchyView" />

<controls:FooterView>
    <Button
        Command="{Binding LogEntryCommand}"
        CommandParameter="{Binding Source={x:Reference EntryHierarchyView}, Path=SelectedEntry}"
        Text="Log Entry" />
</controls:FooterView>

Command

[RelayCommand]
private async Task LogEntry(EntryDescriptionHierarchy? entryDescriptionHierarchy)
{
    if (entryDescriptionHierarchy is null)
    {
        return;
    }

    // Do something
}

If I add the x:DataType to my command parameter:

CommandParameter="{Binding Source={x:Reference EntryHierarchyView}, Path=SelectedEntry, x:DataType=controls:SelectableEntryHierarchyView}"

I get the following warning

I'm not sure if this way of using xaml is recommended anymore. Could anyone explain whether this is the correct approach and offer suggestions?

The reason I'm using x:Reference here is I can pass the object directly to my command as opposed to having my list bind to a property in my viewmodel, then my command have to check it there. In my opinion this is a cleaner approach of setting up my UI, is this approach still valid?

[Axemasta]

@simonrozsival appreciate you're probably quite busy, but would you be able to clarify my question given the scenario above fro the new xaml compilation engine?

[Axemasta]

I've made a repro of both scenarios (button command param & collection view) here.

On both source bindings with x:DataType i see the warning reported above:

It did occur to me that this could be a rider issue because its not a warning reported by the cli, however it doesn't hurt to check whether this is the correct way to be doing things!

[maonaoda]

Which IDE are you using? VSCode？

---

Will there be a warning if you write it like this?

            <Button
                Command="{Binding ReportCommand}"
                CommandParameter="{Binding Source={x:Reference DatePicker}, Path=Date, x:DataType={DatePicker}}"
                Text="Report Date" />

[simonrozsival]

I'm not getting the same warning in build logs or in VS Code. Are you getting that warning just in the IDE? Can you build and run that app?

[maonaoda]

It turns out to be Rider

[Axemasta]

I'm not getting the same warning in build logs or in VS Code. Are you getting that warning just in the IDE? Can you build and run that app?

Yes the app builds, runs and behaves as expected. It's probably just a rider issue by the looks of it!