using System;

​

​

public class EventManager

{

    // Method to emit event

    public void Emit(string eventName)

    {

        // TODO: Implement the Emit method to trigger the specified event and invoke all associated event handlers.

        // This method should execute the event handlers subscribed to the specified event name.

        // If no event handlers are subscribed to the event name, do nothing.

    }

​

​

    // Method to turn the event on for a specific subscriber

    public void On(string eventName, Action handler)

    {

        // TODO: Implement the On method to subscribe a callback to the specified event name.

        // The callback should trigger every time the event is emitted.

        // If the same callback is subscribed multiple times, it should trigger every time.

    }

​

    // Method to turn the event off for a specific subscriber

    public void Off(string eventName, Action handler)

    {

        // TODO: Implement the Off method to unsubscribe the specified callback from the specified event name.

        // If the specified callback is not subscribed to the event name, do nothing.

    }

}

public class Program

{

    public static void Main()

    {

        var em=new EventManager();

        Action way=()=>Console.WriteLine("this is the way");

        Action hello=()=>Console.WriteLine("hello");

        em.On("hello",hello);

        em.On("this is the way",way);

​

        em.Emit("hello");//hello

        em.On("hello",hello);

        em.Emit("hello");//hello ,doesnt print duplicate event

       Action hello2=()=>Console.WriteLine("hello2"); //diffrent instance will print the 2 events

        em.On("hello",hello2);

        em.Emit("hello");//hello, hello2 

​

       em.Off("this is the way",way);

       em.Emit("this is the way");//does nothing

       em.Emit("hello");//hello

​

    }

}