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C# events
TheCodeTrooper
on Mar 30, 2020
//1. (Optionally) Make a event class to return data in. Microsoft has a EventArgs class you can derive from, but benifits are minimal besides ahereance to standards.
//2. Make a event class 2 sub scribe to or that will publish the event.
//3. In any place you wish to use the event (subscribe to the event) or subscribe to the event.
/// 1. An event argument to handle the Data received
public class YourEventReceiveEventArgs : EventArgs
{
//give out any properties you wish the subscriber to have here.
//often makeing the set private so the event can be secure is a good idea.
public byte[] YourDataAsProperties { get; private set; }
public DateTime DateTime { get; private set; } = DateTime.UtcNow;
internal DataReceiveEventArgs(byte[] Data){ this.Data = Data; }
}
//2. In the Class that will be raise (creates and orignates from) the event add a delegate EventHandler
public class YourEventPublishingClass
{
//Create a delegate of the signiture of methods you would like to subscribe the event to
//Optionally: The object is sender is optional but is a ahereance to standards.
//Optionally: Add the event class that you would like to pass data in
public delegate void YourEventHandler(object Sender, DataReceiveEventArgs e);
//create Your event using your newly created signature.
public event YourEventHandler YourEvent;
//Create a way to raise your event this could be a call to check
//something durring another in anthor thread or async watch method.
protected void RaseEvent()
{
//if(Condtions are met)
if(true)
handler?.Invoke(this, e);
}
}
//3. Subscribe to event and attach a method to rase on the event
private class YourSubscriberClass
{
//using instance of the class (or you could have a static style class in some rare cases) subscribe
//note how you instance and pass the class is up to you.
private YourEventPublishingClass YourEventPublishingClassProperty;
public YourSubscriberClass(YourEventPublishingClass EventClassIn)
{
YourEventPublishingClassProperty = EventClassIn;
YourEventPublishingClassProperty.YourEvent += YourEventRecivedMethodEvent;
}
//Make sure you your event follows the signature of your delagate
private void YourEventRecivedMethodEvent(object Sender, YourEventReceiveEventArgs e)
{
//replace this with your code
}
}Source: docs.microsoft.com
events in c# geeksforgeeks
Homely Horse
on Jul 16, 2020
using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks; namespace event_programming{ //This is Subscriber Class class Program { static void Main(string[] args) { AddTwoNumbers a = new AddTwoNumbers(); //Event gets binded with delegates a.ev_OddNumber += new AddTwoNumbers.dg_OddNumber(EventMessage); a.Add(); Console.Read(); } //Delegates calls this method when event raised. static void EventMessage() { Console.WriteLine("********Event Executed : This is Odd Number**********"); } } //This is Publisher Class class AddTwoNumbers { public delegate void dg_OddNumber(); //Declared Delegate public event dg_OddNumber ev_OddNumber; //Declared Events public void Add() { int result; result = 5 + 4; Console.WriteLine(result.ToString()); //Check if result is odd number then raise event if((result % 2 != 0) && (ev_OddNumber != null)) { ev_OddNumber(); //Raised Event } } }}Source: www.completecsharptutorial.com
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