Using Timers in C#

Example 1: In Windows Forms applications Create a new Windows Forms Application: csharptimers1 For WinForms applications we make use of the System.Windows.Forms.Timer [code language="csharp"] private static readonly Timer Timer = new Timer(); [/code] Some common Timer tasks are to: 1. Subscribe to the event that is called when the interval has elapsed: [code language="csharp"] Timer.Tick += TimerEventProcessor; [/code] 2. Set the Timer interval: [code language="csharp"] Timer.Interval = 5000; [/code] 3. Start the timer (these are equivalent): [code language="csharp"] Timer.Start(); Timer.Enabled = true; [/code] 4. Stop the timer (these are equivalent): [code language="csharp"] Timer.Stop(); Timer.Enabled = false; [/code] Example Usage: [code language="csharp"] using System; using System.Windows.Forms; namespace TimerAppWinForms { public partial class Form1 : Form { private const string Caption = "Interval elapsed. Continue running?"; private static readonly Timer Timer = new Timer(); public Form1() { InitializeComponent(); Timer.Tick += TimerEventProcessor; Timer.Interval = 5000; Timer.Start(); } // This is the method to run when the timer is raised. private static void TimerEventProcessor(object myObject, EventArgs myEventArgs) { Timer.Stop(); var result = MessageBox.Show(Caption, "", MessageBoxButtons.YesNo); if (result == DialogResult.Yes) { Timer.Start(); } } } } [/code] When run we are initially presented with the default form: csharptimers2 And after the 5 second (5000 millisecond) interval has elapsed, the function that handles this event is run, presenting the user with a dialog to either continue with the timed event or exit: csharptimers3 Example 2: In Console Applications Create a new Console Application: csharptimers4 When using timers in Console applications we must instead use System.Timers.Timer: [code language="csharp"] var timer = new System.Timers.Timer(); [/code] As with the previous WinForms example, we subscribe the appropriate event (this time called ‘Elapsed’), set the time interval and kick off the timer: [code language="csharp"] timer.Elapsed += new ElapsedEventHandler(TimerEventProcessor); timer.Interval = 5000; timer.Start(); [/code] Full code sample looks like this: [code language="csharp"] using System; using System.Timers; namespace TimerAppConsole { internal class Program { private static void Main(string[] args) { var timer = new Timer(); timer.Elapsed += TimerEventProcessor; timer.Interval = 5000; timer.Start(); Console.WriteLine("Press \'q\' to quit the sample."); while (Console.Read() != 'q') { } } private static void TimerEventProcessor(object myObject, EventArgs myEventArgs) { Console.WriteLine("Time Elapsed..."); } } } [/code] Giving the following Console output: csharptimers5

Comments

Post a Comment

Popular posts from this blog

Using the Supervisor Controller Pattern to access View controls in MVVM

Image
As discussed on a StackOverflow post , this is considered bad practice, so only use this when necessary. Step 1: Create a new WPF project Step 2: Add event handling code A number of classes are needed for doing command bindings in MVVM. Create the following classes and add to your Visual Studio project: RelayCommand.cs [code language="csharp"] using System; using System.Windows.Input; namespace SupervisorControllingPattern { public class RelayCommand<T> : ICommand { private readonly Predicate<T> _canExecute; private readonly Action<T> _execute; public RelayCommand(Action<T> execute) : this(execute, null) { _execute = execute; } public RelayCommand(Action<T> execute, Predicate<T> canExecute) { if (execute == null) throw new ArgumentNullException(nameof(execute)); _execute = execute; _canExecute = canExecute; ...
Read more

Getting started with Tesseract optical character recognition (OCR) library in Visual Studio

Image
This post is a how-to guide on how to get up and running with using the tesseract optical character recognition (OCR) library in a Microsoft Visual Studio environment. The original link can be found at the following github location: https://tesseract-ocr.github.io/tessdoc/Compiling.html#windows Step 1: Build the latest library (using Software Network client) Download and extract the latest SW (Software Network https://software-network.org/) client from the following location: https://software-network.org/client/sw-master-windows-client.zip Open a DOS command prompt and run the following commands: [code language="xml"] sw setup sw build org.sw.demo.google.tesseract.tesseract-master [/code] As shown in the following screenshot: Step 2: Install git if you have not already done so You will need git to download the libraries needed for this project. Download link for obtaining the git for Windows executables etc here: https://git-scm.com/download/win...
Read more

How to send an e-mail via Google SMTP using C#

Image
First things first, some useful StackOverflow links: https://stackoverflow.com/questions/9201239/send-e-mail-via-smtp-using-c-sharp https://stackoverflow.com/questions/17462628/the-server-response-was-5-7-0-must-issue-a-starttls-command-first-i16sm1806350 To demonstrate how this is done I first create a new Visual Studio project: Some example code for sending an email via a Google email account (smtp.goolgle.com) - obviously replace this with email / credentials of your own... I put the code within a try-catch block in order to capture any errors that may occur while attempting this. [code language="csharp"] using System; using System.Net; using System.Net.Mail; namespace EmailSmtp { class Program { static void Main(string[] args) { try { // Credentials var credentials = new NetworkCredential("someEmail@gmail.com", "somePassword"); // Mail message var ...
Read more