Access private property with internal type AOT save

Question

i tried to resolve aot warnings in my .Net maui app. I have a mapping like this:

    Microsoft.Maui.Handlers.TabbedViewHandler.Mapper.AppendToMapping("TabbedPageCenterLabels", (handler, view) => {
        var tabbedPageManager = typeof(TabbedPage).GetField("_tabbedPageManager", BindingFlags.NonPublic | BindingFlags.Instance)?.
            GetValue(handler.VirtualView);

        var navView = (BottomNavigationView?)tabbedPageManager.GetType()
            .GetProperty("BottomNavigationView", BindingFlags.NonPublic | BindingFlags.Instance)
            ?.GetValue(tabbedPageManager);
    });

The GetProperty("BottomNavigationView",..) method generate a IL2075 warning. My problem is, that the "_tabbedPageManager" field in TabbedPage is type of TabbedPageManager. TabbedPageManager is a internal class. From this internal class i need the "BottomNavigationView" private property.
How can i get the BottomNavigationView property in internal class TabbedPageManager?

Most samples i found using this: typeof(MyClass).GetProperty("..."). But can't use typeof(TabbedPageManager).GetProperty("...") because TabbedPageManager is not accessable (internal). Also

[UnsafeAccessor(UnsafeAccessorKind.Method, Name = "get_BottomNavigationView")]
extern static BottomNavigationView InstanceGetter(TabbedPageManager @this);

is not working. For the same reason.

Thank you

Unfortunately, you cannot solve all trimming (here AOT) issues, especially when you don't own a called code and that code is itself non-trimmable. You might want to try refining trimming see learn.microsoft.com/en-us/dotnet/core/deploying/trimming/… and devblogs.microsoft.com/dotnet/… — Simon Mourier
– Simon Mourier, Commented Apr 30 at 11:55

Saftpresse99 · Accepted Answer · 2025-05-08 07:07:02Z

0

Depending on @Szymon Roziewski answer, this works for me:

protected override void ConnectHandler(View nativeView) {
    base.ConnectHandler(nativeView);
    nativeView.Post(() => {
        var parent = nativeView?.Parent;
        while(parent != null) {
            if(parent is ViewGroup parentGroup) {
                bottomNavigationView = FindBottomNavigationView(parentGroup);
                if(bottomNavigationView != null) {
                    //Do something
                    break;
                }
            }
            parent = parent.Parent;
        }
    });
}

The bottomNavigationView is in the parent layout and inserted by MAUI after the handler is connected.

answered May 8 at 7:07

Saftpresse99

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