#388 – Declaring and Using Private Events

You can declare private events in a class and they can be either instance or static events.  A private event is one that code within the class can subscribe to, but that is not visible to code outside the class.

For example, we can create a private static event in the Dog class that will fire whenever a new dog is created.

        private static event EventHandler<DogCreatedEventArgs> DogCreated;

This event will be visible only to code within the Dog class.

In the static constructor, we attach a handler that will record each Dog created.

        static Dog()
        {
            Dog.DogCreated += new EventHandler<DogCreatedEventArgs>(Dog_DogCreated);
        }

        static List<string> DogList = new List<string>();
        static void Dog_DogCreated(object sender, DogCreatedEventArgs e)
        {
            DogList.Add(e.Name);
        }

Finally, we fire the event from the instance constructor.

        public Dog(string name)
        {
            Name = name;

            if (Dog.DogCreated != null)
                Dog.DogCreated(this, new DogCreatedEventArgs(name));
        }
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About Sean
Software developer in the Twin Cities area, passionate about .NET technologies. Equally passionate about my own personal projects related to family history and preservation of family stories and photos.

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