Action<T> vs delegate event
c#, delegates
Solution
Fwiw, neither example uses standard .NET conventions. The `EventHandler<T>` generic should declare the event:
public event EventHandler<EmployeeEventArgs> Leave;
The "On" prefix should be reserved for a protected method that raises the event:
protected virtual void OnLeave(EmployeeEventArgs e) {
var handler = Leave;
if (handler != null) handler(this, e);
}
You don't have to do it this way, but anybody will instantly recognize the pattern, understand your code and know how to use and customize it.
And it has the great advantage of not being forced to choose between a custom delegate declaration and `Action<>`, `EventHandler<>` is the best way. Which answers your question.
Problem
I have seen developers using the below codes quite alternatively. What is the exact difference between these, and which ones go by the standard? Are they same, as `Action` and `Func<T>` is a delegate as well: ``` public event Action<EmployeeEventAgs> OnLeave; public void Leave() { OnLeave(new EmployeeEventAgs(this.ID)); } ``` VS ``` public delegate void GoOnLeave(EmployeeEventAgs e); public event GoOnLeave OnLeave; public void Leave() { OnLeave(new EmployeeEventAgs(this.ID)); } ```