Writing .Net Events, the even shorter version

26 August 2016

A follow up to my previous quick start for writing C# events. Let’s assume you just want to raise a simple event which can be represented by EventArgs. If not, read the guide linked above.

1. Add a delegate above the class

public delegate void FinishedHandler(object sender, EventArgs e);

public class MyClassWhichFiresEvents
{
	...
}

2. Add a public event and a method to fire it inside the class

public delegate void FinishedHandler(object sender, EventArgs e);

public class MyClassWhichFiresEvents
{
    public event FinishedHandler Finished;

    private void RaiseFinished()
    {
        Finished(this, new EventArgs());
    }

	...
}

You can add more detail by using a properly qualified EventArgs or perhaps passing one into the RaiseFinished() method. Call RaiseFinished() anywhere you want to fire the event within your class.

3. Handle the event in your consumer (your app or whatever)

public class ConsumerClass
{
	private MyClassWhichFiresEvents EventOwner;
	
	public ConsumerClass()
	{
		EventOwner = new MyClassWhichFiresEvents();
		EventOwner.Finished += EventOwner_Finished;
	}

	private void EventOwner_Finished(Object sender, EventArgs e)
	{
		// Handle the event
	}
}

Finished!

Hope it helps!