Передача параметра в событие

public event Action<ObservableCollection<string>, string> SampleEvent;

namespace EventsDemo
{
    class Program
    {
        // Declare the delegate (if using non-generic pattern).
        public delegate void SampleEventHandler(object sender, SampleEventArgs e);
 
        // Declare the event.
        public event SampleEventHandler SampleEvent;
 
        // Wrap the event in a protected virtual method
        // to enable derived classes to raise the event.
        protected virtual void RaiseSampleEvent()
        {
            // Raise the event in a thread-safe manner using the ?. operator.
            SampleEvent?.Invoke(this, new SampleEventArgs("Hello"));
        }
    }
 
    public class SampleEventArgs
    {
        public SampleEventArgs(string text) { Text = text; }
        public string Text { get; } // readonly
    }
}

class MyEventArgs : EventArgs {}
 
class Program {
  public event EventHandler<MyEventArgs> MyEvent;
}

public class StringObservableCollection : ObservableCollection<string> {}
public class IntegerObservableCollection : ObservableCollection<int> {}
public class PointObservableCollection : ObservableCollection<Point> {}