Apr 29, 2009 · One key difference between using events and delegates, is that events can only be invoked from within the class that they were declared in, even though they may be declared as public. This is a very important distinction, because it allows your events to be exposed so that they are "connected" to external methods, while at the same time they ...

Jul 28, 2010 · This is called multicasting. You can use the + or += operator to add another method to the invocation list of an existing delegate instance. Similarly, you can also remove a method from an invocation list by using the decrement assignment operator (- or -=). This feature forms the base for events in C#. Below is a multicast delegate example.

Jul 7, 2016 · Aside from the general capitalization guidelines, here is what it has for 'Events' on the page Names of Type Members: ️ DO name events with a verb or a verb phrase. Examples include Clicked, Painting, DroppedDown, and so on. ️ DO give events names with a concept of before and after, using the present and past tenses.

Mar 17, 2010 · For really simple events, EventHandler might be enough: public event EventHandler CollectMapsReportingComplete; Sometimes you will want to declare your own delegate type to be used for your events, allowing you to use a custom type for the EventArgs parameter (see Adam Robinson's comment):

Apr 9, 2009 · instanceOfClassWithDelegate.sampleDelegate.Invoke(); // not possible with events. the client cannot list or clear the functions assigned to the delegate when using events. instanceOfClassWithDelegate.sampleDelegate = null; // not possible when using events. events are a better way to encapsulate logic as is implicitly understood

Jul 11, 2016 · Clearing All Events. Okay, let's say you're through with events and you don't want to process any more. Just set it to null like so: MyEvent = null; The same caution for Unsubscribing events is here, as well. If your custom event handler no longer has any events, and you trigger it again, your program will throw an exception.

Note, however, the warnings on that page about memory leaks when attaching to static events; that applies to all static events. There's nothing magical about when you use them: when you need to provide an event for a static class or an event that deals exclusively with static data and it makes sense to implement it this way.

Jan 5, 2012 · There are loads of things which are possible once you bring in reflection that simply can't be done with C# and often with good reason. For example allowing you to invoke my event for me is dangerous. It could very easily break subtle guarantees my consumers depend on (book end events for example). –

Aug 26, 2008 · Briefly, the take away from the article - Events are encapsulation over delegates. Quote from article: Suppose events didn't exist as a concept in C#/.NET. How would another class subscribe to an event? Three options: A public delegate variable. A delegate variable backed by a property. A delegate variable with AddXXXHandler and ...

Event names defined in c# class and interface method names defined on interface must be the same. In this example IEvents::OnDownloadCompleted corresponds with DemoEvents::OnDownloadCompleted . Then a second interface is defined which represents the public API of the class itself, here it is called IDemoEvents .