Lesson 19 - Events in C# .NET
In the previous lesson, Delegates, anonymous methods and lambda expressions in C#, we learned about delegates in C# .NET. In today's tutorial, we're going to go over what events are. This lesson will help you understand how event handling in (windows) form applications works and how to create events in your classes.
Sometimes, we need to respond to an event in the program. A great practical example is form applications. When we click on a button, a handler method is called and performs an action. We could come up with many events, e.g. minimizing the window, moving the mouse or even losing the internet connection. Without knowledge of event principles, or even delegates, we would probably still be able to create an application of the sort anyway. However, it would be very confusing and most would likely make it difficult to add or modify events.
An event is a delegate with one extra feature
...End of the preview...
ict.social is a large database made up of manuals and tutorials, whose main goal is to provide high-quality IT education to everyone. We started out in the Czech republic, where we display roughly a million articles per month and receive plenty of gratitude from our users. Thanks to our successful establishment, we are now bringing these articles to the rest of the world.
Although we are trying to keep our content free of charge, maintaining the site is a huge effort for everyone involved. Therefore, some content (exercises and more advanced material) costs network points. Don't worry, they're really cheap :)
Requested article covers this content:
In this tutorial, we'll introduce events and the EventHandler delegate. As an example, we will have a listener react to instance changes.
|To access the article, you will need||10 points|
|Currently, you have||0 points|
|You gain 10 points for adding an article to the site, or for||$0.90|
Before buying this article, you have to buy the previous one
Buying this article gives you unlimited access to it forever. You will learn some more and help us keep giving our site maintenance which helps you and others get better futures. It's a win-win.
You gain points by supporting our network. This is done by sending a helpful amount of money to support the site, or by creating content for the network.
You can get points immediately using:
|Credit card||SMS||Wire transfer|