static void Main(string[] args)
{
//Delegate
var subs = new Subs();
new User("u1").Upload(subs);
new User("u2").Upload(subs);
new User("u3").Upload(subs);
subs.Uploads = null;
subs.Uploads += () => { Console.WriteLine("reset"); };
new User("u4").Upload(subs);
subs.Uploads();
Console.WriteLine();
//Event
//only -=, += ; no direct call outside class
var subsEvent = new SubsEvent();
subsEvent.Uploads += () => { Console.WriteLine("Ev1"); };
subsEvent.Uploads += () => { Console.WriteLine("Ev2"); };
subsEvent.GetUploads();
var subsEvent2 = new SubsEvent2();
subsEvent2.Uploads += (object s, EventArgs e) => { Console.WriteLine("Evh1"); };
subsEvent2.Uploads += (object s, EventArgs e) => { Console.WriteLine("Evh2"); };
subsEvent2.GetUploads();
}
public void Upload(Subs s)
{
s.Uploads += () => { Console.WriteLine($"{Name} uploaded"); };
}