Naming C# events and handlers properly [closed]

Answer 1

Almost

The method to fire the event - On<When>Event (from RaiseSomethingHasHappened)

i.e. OnBeforeOpen, OnClosing, OnSomethigHasHappened

The event <When>Event (from OnSomethingHasHappened)

i.e. BeforeOpen, Closing, SomethingHasHappened

the handler <The Instance or meaningful Name><_><Event> (from Car_SomethingHasHappened)

i.e. Form_BeforeOpen, Window_Closing, Car_SomethingHasHappened -> perfect

Answer 2

Well, the first point is that you define your own naming convention and there is no 'wrong' way to do it (as long as it's consistent).

Having said that, the Microsoft standards are good if your sharing your code with other.

Normally, you would have events names as:

public class Car
{
 // is event named correctly?
 public event EventHandler<EventArgs> SomethingHasHappened;

 private void MoveForward()
 {
  OnSomethingHasHappened();
 }

 // is the named correctly
 protected virtual void OnSomethingHasHappened()
 {
  EventHandler<EventArgs> locum = SomethingHasHappened;
  if(locum!= null)
  {
   locum(this, new EventArgs()); 
  }
 }
}

Note that the event is titled without the 'On' prefix, and the event firing method is named with the 'On' prefix. The event firing method is also protected virtual so that derived classes can override to change/add to the behaviour as well as use it to fire the event themselves when required.

Answer 3

I would say the naming convention is okay, but what i miss in you example WHAT happened?

So i would more specialize the name of the event itself (like MovedForward) or if you need it more generalized you should provide some additional information within the EventArgs about what has changed (like the ListChanged in BindingList).

Answer 4

I tend to do the opposite:

public event EventHandler SomethingHappened;

private void OnSomethingHappened()
{
    SomethingHappened();
}

Then:

private void Car_SomethingHappened()
{

}

Not the cleanest code, but the naming is how I do it. If there isn't a clear local variable name or it doesn't make sense, I suffix the name with "Handler":

private void SomethingHappenedHandler() {}

Answer 5

I personally look at how Microsoft has named their events and how they name their handlers.

class Form{
   public event EventHandler<EventArgs> MouseMove;
   public virtual void OnMouseMove()
   {
       if(MouseMove != null)
       {
           MouseMove(this, new EventArgs());
       }
   }
}

class Application{
   public Application()
   {
       Form form = new Form();
       form.MouseMove += //Hook your own Method
   }
}