Net5 Using Observable.FromEventPattern<KeyEventArgs>

[SID9-HoneyBee]

I want to use RX in WPF Net5.

To control the KeyDown event
I used Observable.FromEventPattern .

I installed System.Reactive as a Nuget package, but

ObserverOn does not find DispatcherScheduler .

keyDownSubscripton = Observable.FromEventPattern(this, "KeyDown")
.Do(e =>
{
// Do something on key down event

        })
        .Delay(TimeSpan.FromMilliseconds(10))
        .ObserveOn(System.Reactive.Concurrency.DispatcherScheduler.Current) // OnNext on UI thread
        .Subscribe(e =>
        {
            // Do something after delay
            //viewModel.ChangeContentCommand.Execute(null);
        });

How do I fix it?

[clairernovotny]

You need to specify the 19041 SDK, like this net5.0-windows10.0.19041 as the TFM. You can target lower builds of Windows if desired, as that simply specifies the SDK used to build.