Debug.WriteLine() in Android .NET 9 no longer creates any output (regression, previously working in .NET 8) #9628
Description
Description
Since updating to .NET 9 I have seen I am not getting anything showing from Debug.WriteLine() when I run Android on a local device by USB in Debug mode.
To verify this, I created a simple project which is the base .NET 9 project with just the following added to App.xaml.cs:
IDispatcherTimer timer = Application.Current.Dispatcher.CreateTimer();
timer.Interval = TimeSpan.FromSeconds(1);
timer.Tick += delegate {
Debug.WriteLine("SECOND PASSED: " + DateTime.UtcNow.Second);
};
Debug.WriteLine("START TIMER");
timer.Start();
In Windows I see the START TIMER and SECOND PASSED: output easily in my Output section of Visual Studio. But with an attached Samsung Android device and debugging to that, I do not see any such output anymore.
The same Android device allows Debug.WriteLine() to work with similar code in .NET 8, so this is not a device issue. Rather, I believe this is a .NET 9 issue.
Obviously we need Debug.WriteLine() to figure out issues as we are coding in Android so this would be very helpful to have fixed.
Steps to Reproduce
Open demo project, run in Debug mode in Windows and Android to device, see output in Windows only.
Link to public reproduction project repository
https://github.com/jonmdev/AndroidDotNet9DebugBug
Version with bug
9.0.21 SR2.1
Is this a regression from previous behavior?
Yes, this used to work in .NET MAUI
Last version that worked well
8.0.0-preview.1.7762
Affected platforms
Android