using static MyClass;

internal class Program
{
    private static void Main(string[] args)
    {
        MyClass cls = new();
        cls.OnFinished += new OnFinishedEventHandler(Cls_OnFinished);
        cls.OnFinished += Cls_OnFinished;

        //Annonymous Method 사용
        cls.OnFinished2 += delegate (object? sender, EventArgs eventArgs)
        {
            Console.WriteLine("Finished");
        };

        //Lambda 식 사용, 무명메서드를 대신할 수 있다.
        //(입력 파라미터) => { 실행문장 블럭 };
        cls.OnFinished += (sender, eventArgs) => { Console.WriteLine("Finished"); };

    }

    private static void Cls_OnFinished(object? sender, EventArgs eventArgs)
    {
        Console.WriteLine("Finished");
    }
}

class MyClass
{
    //EventHandler를 delegate로 구현
    public delegate void OnFinishedEventHandler(object? sender, EventArgs eventArgs);
    public event OnFinishedEventHandler? OnFinished;

    public EventHandler<EventArgs>? OnFinished2;

    public void Run(int complexity)
    {
        Thread.Sleep(complexity);
        OnFinished?.Invoke(this, EventArgs.Empty);
        OnFinished2?.Invoke(this, EventArgs.Empty);
    }
}