Add event handler during object initialization

Question

I need to pass a instance (which will be created in this very moment) of a certain type to a method. This type offers several events which I\'d like to subscribe to too, so my c

Answer 1

This is not possible right now but according to Roslyn it is planned and might be available in the future.

--------------------------------------------------------------------------
| Feature            | Example                                |   C#     |
-------------------------------------------------------------------------|
| Event initializers |  new Customer { Notify += MyHandler }; | Planned  |
-------------------------------------------------------------------------|

Answer 2

I can advise you next trick in case if source code available: add public property with type of you event that take incoming value on set and attach this handler to event you need

For example:

namespace TrickAddEventHandlerInObjectInitializer
{
class A
{
    public EventHandler AddHandlerToEventByAssignMe
    {
        set { Event += value; }
    }

    public event EventHandler Event;

    public void DoSmthAndInvoke()
    {
        Event?.Invoke(this, new EventArgs());
    }
}

class Program
{
    static void Main(string[] args)
    {
        var a = new A
        {
            AddHandlerToEventByAssignMe = A_Event
        };

        a.DoSmthAndInvoke();
    }

    private static void A_Event(object sender, EventArgs e)
    {
        throw new NotImplementedException();
    }
}
}