An event is the occurrence of something we can handle somehow with our code. More precisely, in .NET, an event is a kind of Delegate object, an object that represents one or multiple actions to run. The Delegate object is the .NET implementation of the Observer pattern with the addition of other features, such as asynchronous execution.
By convention, any event in .NET uses the Delegate implementation specific to System.EventHandler or any other childhood according to the inheritance tenet. This implementation accepts handlers (subscribers) that must accept two parameters, such as the following example:
static void EventHandler1(object o, EventArgs e)
{
Console.WriteLine("Handling for object {0}", o);
}
In place of using the generic EventArgs type as an event parameter as specified by the EventHandler delegate, when using the related generic version EventHandler<T>, we can use any other type as an argument parameter.
By using reactive...