How to create wrapper over event in C#

Question

Let's say I have this class:

public class someClassA
{
    Connector connector;

    public void SubscribeToEvent(IList<string> stockNames)
    {
        connector.OnEventReceived += SomeReceiverMethod;
    }

    private void SomeReceiverMethod(ReceivedData receivedData)
    {
        Console.WriteLine(receivedData);
    }
}

What I want to do is to get this received data in other class on subscribe

public class someClassB
{
   var classA = someClassA;
   someClassA.SomeSender += SomeReceiver;
}

How can I achieve that SomeSender from someClassB?

Answer 1

There are two basic ways

1. Raise a new event:

private void SomeReceiverMethod(ReceivedData receivedData)
{
    DataReceived?.Invoke(this, receivedData);
}
public event EventHandler<ReceivedData> DataReceived;

2. Forward the event registrations

// EventReceivedDelegate needs to be the same type as OnEventReceived 
public event EventReceivedDelegate EventReceived{
   add => connector.OnEventReceived += value;
   remove => connector.OnEventReceived -= value;
}

The former is more flexible since it allow you to do some processing of the data before raising the next event, as well as changing types etc. But it require a bit more code