【转载】#370 - Subscribe to an Event by Adding an Event Handle

You subscribe to a particular event in C# by defining an event handler-code that will be called whenever the event occurs (is raised). You then attach your event handler to an event on a specific object, using the += operator.

Below is an example where we define an event handler for the Dog.Barked event. Each time that kirby barks, we'll record the date and time of the bark in a list.

 private static List<DateTime> barkLog = new List<DateTime>();

 static void Main()
 {
     Dog kirby = new Dog("Kirby", );
     kirby.Barked += new EventHandler(kirby_Barked);

     kirby.Bark();
     Console.ReadLine();

     kirby.Bark();
     Console.ReadLine();
 }

 // Neither argument is used, for the moment
 static void kirby_Barked(object sender, EventArgs e)
 {
     // Log kirby's barks
     barkLog.Add(DateTime.Now);
 }

Assuming that the Dog class fires its Barked event whenever we call the Bark method, our handler will get called whenever kirby barks.

原文地址：#370 - Subscribe to an Event by Adding an Event Handle