C# Dynamic Event Subscription

Question

How would you dynamically subscribe to a C# event so that given a Object instance and a String name containing the name of the event, you subscribe to that event and do some

Answer 1

I recently wrote a series of blog posts describing unit testing events, and one of the techniques I discuss describes dynamic event subscription. I used reflection and MSIL (code emitting) for the dynamic aspects, but this is all wrapped up nicely. Using the DynamicEvent class, events can be subscribed to dynamically like so:

EventPublisher publisher = new EventPublisher();

foreach (EventInfo eventInfo in publisher.GetType().GetEvents())
{
    DynamicEvent.Subscribe(eventInfo, publisher, (sender, e, eventName) =>
    {
        Console.WriteLine("Event raised: " + eventName);
    });
}

One of the features of the pattern I implemented was that it injects the event name into the call to the event handler so you know which event has been raised. Very useful for unit testing.

The blog article is quite lengthy as it is describing an event unit testing technique, but full source code and tests are provided, and a detailed description of how dynamic event subscription was implemented is detailed in the last post.

http://gojisoft.com/blog/2010/04/22/event-sequence-unit-testing-part-1/