https://github.com/strypper/eventhandleranddelegate

This is a small demo to demonstrate how to use EventHandler and Delegate, for more detail see Mosh explain at https://youtu.be/jQgwEsJISy0
https://github.com/strypper/eventhandleranddelegate

console csharp delegate event-handler

Last synced: 12 months ago
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This is a small demo to demonstrate how to use EventHandler and Delegate, for more detail see Mosh explain at https://youtu.be/jQgwEsJISy0

• Host: GitHub
• URL: https://github.com/strypper/eventhandleranddelegate
• Owner: Strypper
• Created: 2020-04-26T10:38:21.000Z (almost 6 years ago)
• Default Branch: master
• Last Pushed: 2024-06-04T05:46:05.000Z (over 1 year ago)
• Last Synced: 2025-02-27T03:11:51.413Z (about 1 year ago)
• Topics: console, csharp, delegate, event-handler
• Language: C#
• Size: 452 KB
• Stars: 4
• Watchers: 1
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
# Event Handler and Delegate in C#

For what ? 

* Loosely couple architecture

* Easy to test

# What is in the code ?

	There are 2 type of Event Handler, the one with no parameter and the one with code inside it

# No Parameter

* Create a delegate

* Create an Event Handler based on that delegate

* Raise the Event

![](Demo/NoParameter.png)

# With Parameter

* Create a delegate but with a class which inheritances a custom EventArgs as second parameter

* Create an EventHanlder base on the above Delegate

* Require the trigger method with the parameter we need

* Raise the Event

![](Demo/WithParameter.png)

# Better Way

In the new C# version we don't need to do this 

```cs

         	public delegate void VideoEncodedHandler(object source, VideoEventArgs args);

        	public event VideoEncodedHandler videoEncoded;

```

Instead just to this

```cs

	public event EventHandler videoEncodedWithParameter;

```

#Execute the example

```cs

        static void Main(string[] args)

        {

            //Event with no Parameter

            Video v = new Video("Family Guy");

            var VE = new VideoEncoder();

            var SE = new SendEmail();

            var SS = new SendSMS();

            VE.videoEncoded += SE.OnVideoEncoded;

            VE.videoEncoded += SS.OnVideoEncoded;

            VE.EncodeVideo(v);

            //Event with Parameter

            Video v1 = new Video("Fuck you Peter");

            var VEP = new VideoEncoderWithParameter();

            var SEP = new SendEmailWithParameter();

            var SSP = new SendSMSWithParameter();

            VEP.videoEncodedWithParameter += SEP.OnVideoEncoded;

            VEP.videoEncodedWithParameter += SSP.OnVideoEncoded;

            VEP.EncodeVideo(v1);

        }

```