How to resolve the algorithm Events step by step in the C# programming language

Published on 12 May 2024 09:40 PM

How to resolve the algorithm Events step by step in the C# programming language

Table of Contents

Problem Statement

Event is a synchronization object. An event has two states signaled and reset. A task may await for the event to enter the desired state, usually the signaled state. It is released once the state is entered. Releasing waiting tasks is called event notification. Programmatically controlled events can be set by a task into one of its states. In concurrent programming event also refers to a notification that some state has been reached through an asynchronous activity. The source of the event can be: Event is a low-level synchronization mechanism. It neither identify the state that caused it signaled, nor the source of, nor who is the subject of notification. Events augmented by data and/or publisher-subscriber schemes are often referred as messages, signals etc. In the context of general programming event-driven architecture refers to a design that deploy events in order to synchronize tasks with the asynchronous activities they must be aware of. The opposite approach is polling sometimes called busy waiting, when the synchronization is achieved by an explicit periodic querying the state of the activity. As the name suggests busy waiting consumes system resources even when the external activity does not change its state. Event-driven architectures are widely used in GUI design and SCADA systems. They are flexible and have relatively short response times. At the same time event-driven architectures suffer to the problems related to their unpredictability. They face race condition, deadlocking, live locks and priority inversion. For this reason real-time systems tend to polling schemes, trading performance for predictability in the worst case scenario.

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Events step by step in the C# programming language

Explanation:

This C# program demonstrates how to use the System.Timers.Timer class to schedule a periodic task.

Code Walkthrough:

  1. Setting up the Timer:

    • var timer = new Timer(1000);: This line creates a new Timer object. The 1000 argument specifies the interval (in milliseconds) at which the timer will raise the Elapsed event.
    • timer.Elapsed += new ElapsedEventHandler(OnElapsed);: This line subscribes the OnElapsed method to the Elapsed event of the timer. When the timer raises the Elapsed event, the OnElapsed method will be executed.
  2. Starting the Timer:

    • Console.WriteLine(DateTime.Now);: This line prints the current date and time to the console.
    • timer.Start();: This line starts the timer, which will begin raising the Elapsed event every 1000 milliseconds (1 second).
  3. Waiting for User Input:

    • Console.ReadLine();: This line halts the program and waits for the user to press any key to continue.
  4. The OnElapsed Event Handler:

    • static void OnElapsed(object sender, ElapsedEventArgs eventArgs): This is the event handler method that gets executed when the timer raises the Elapsed event.
    • Console.WriteLine(eventArgs.SignalTime);: This line prints the time at which the Elapsed event occurred.
    • ((Timer)sender).Stop();: This line stops the timer to prevent it from raising the Elapsed event again.

Example Output:

When you run this program, it will print the current date and time, followed by the time at which the Elapsed event occurs every second until you press any key to stop it. For example, the output might look something like this:

2023-03-08 14:20:32
2023-03-08 14:20:33
2023-03-08 14:20:34
2023-03-08 14:20:35
(Press any key to stop the timer)

Source code in the csharp programming language

using System;
using System.Timers;

class Program
{
    static void Main()
    {
        var timer = new Timer(1000);
        timer.Elapsed += new ElapsedEventHandler(OnElapsed);
        Console.WriteLine(DateTime.Now);
        timer.Start();
        Console.ReadLine();
    }

    static void OnElapsed(object sender, ElapsedEventArgs eventArgs)
    {
        Console.WriteLine(eventArgs.SignalTime);
        ((Timer)sender).Stop();
    }
}


  

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