Hi Guys
NP114 Moving delagate type
Following program is executing well. For curiosity I have moved public delegate void MeltdownHandler(object reactor, MeltdownEventArgs myMEA); to a different place from it’s original position (Original position is highlighted in yellow. New position is highlighted in blue).
But after moving program is not executing. Please explain the reason. How can it be altered to execuate after moving delagate type to the new position.
Thank you
using System;
public delegate void MeltdownHandler(object reactor, MeltdownEventArgs myMEA);
// declare the MeltdownEventArgs class (implements EventArgs)
class MeltdownEventArgs : EventArgs
{
// declare a private field named message
private string message;
// define a constructor
public MeltdownEventArgs(string message)
this.message = message;
}
// define a property to get the message
public string Message
get
return message;
// declare the Reactor class
class Reactor
// declare a private field named temperature
private int temperature;
// declare a delegate class named MeltdownHandler
//public delegate void MeltdownHandler(object reactor, MeltdownEventArgs myMEA);
// declare an event named OnMeltdown
public event MeltdownHandler OnMeltdown;
// define a property to set the temperature
public int Temperature
set
temperature = value;
// if the temperature is too high, the reactor melts down
if (temperature > 1000)
MeltdownEventArgs myMEA =
new MeltdownEventArgs("Reactor meltdown in progress!");
OnMeltdown(this, myMEA);
// declare the ReactorMonitor class
class ReactorMonitor
public ReactorMonitor(Reactor myReactor)
myReactor.OnMeltdown += new Reactor.MeltdownHandler(DisplayMessage);
// define the DisplayMessage() method
public void DisplayMessage(object myReactor, MeltdownEventArgs myMEA)
Console.WriteLine(myMEA.Message);
public class Example12_4
public static void Main()
// create a Reactor object
Reactor myReactor = new Reactor();
// create a ReactorMonitor object
ReactorMonitor myReactorMonitor = new ReactorMonitor(myReactor);
// set myReactor.Temperature to 100 degrees Centigrade
Console.WriteLine("Setting reactor temperature to 100 degrees Centigrade");
myReactor.Temperature = 100;
// set myReactor.Temperature to 500 degrees Centigrade
Console.WriteLine("Setting reactor temperature to 500 degrees Centigrade");
myReactor.Temperature = 500;
// set myReactor.Temperature to 2000 degrees Centigrade
// (this causes the reactor to meltdown)
Console.WriteLine("Setting reactor temperature to 2000 degrees Centigrade");
myReactor.Temperature = 2000;
/*
Setting reactor temperature to 100 degrees Centigrade
Setting reactor temperature to 500 degrees Centigrade
Setting reactor temperature to 2000 degrees Centigrade
Reactor meltdown in progress!
*/