Generate and consume IAsyncEnumerable<T>.

MainWindow.xaml.cs

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
        this.Loaded += OnLoaded;
    }

    private async void OnLoaded(object sender, RoutedEventArgs e)
    {
        await foreach (var i in GenerateAsync(10))
        {
            Trace.WriteLine($"Consumed {i}");
            if (i >= 5)
                break;
        }

        Trace.WriteLine("Ended");
    }

    static async IAsyncEnumerable<int> GenerateAsync(int count)
    {
        for (int i = 0; i < count; i++)
        {
            await Task.Delay(TimeSpan.FromSeconds(i));
            Trace.WriteLine($"Generated {i}");
            yield return i;
        }
    }

    static async IAsyncEnumerable<int> GenerateAsync(int count, CancellationToken cancellationToken)
    {
        for (int i = 0; i < count; i++)
        {
            await Task.Delay(TimeSpan.FromSeconds(i), cancellationToken);

            cancellationToken.ThrowIfCancellationRequested();

            Trace.WriteLine($"Generated {i}");
            yield return i;
        }
    }
}