"? - Are there any other alte...">
Clever Geek Handbook

What does "x.OnSpeak + = (s, e)" mean?

  • I know "e" is for args event, but what does "s" mean here and "+ = (,) =>"?

  • Are there any other alternatives?

    class Program
{
 static void Main(string[] args)
   {
     var x = new Animal();
     x.OnSpeak += (s, e) => Console.WriteLine("On Speak!");
     x.OnSpeak += (s, e) => Console.WriteLine(e.Cancel ? "Cancel" : "Do not cancel");

     Console.WriteLine("Before");
     Console.WriteLine(string.Empty);

     x.Speak(true);
     x.Speak(false);

    Console.WriteLine(string.Empty);
    Console.WriteLine("After");

    Console.Read();
   }

 public class Animal
 {
  public event CancelEventHandler OnSpeak;
  public void Speak(bool cancel)
   {
     OnSpeak(this, new CancelEventArgs(cancel));
   }
 }
}
+3


source to share


1 answer


This is often referred to as an "inline event" and is just another way to run certain code when an event occurs OnSpeak

.

x.OnSpeak += (s, e) => Console.WriteLine("On Speak!");

s

is sender

, and e

are the arguments of the event.



You can rewrite your code like this, which might be more familiar:

x.OnSpeak += OnSpeakEvent;

private static void OnSpeakEvent(object s, CancelEventArgs e)
{
    Console.WriteLine("On Speak!");
}
+2


source






More articles:


All Articles