public delegate void DivBySevenHandler(object o, DivBySevenEventArgs e);
public class DivBySevenEventArgs : EventArgs
{
public readonly int TheNumber;
public DivBySevenEventArgs(int num)
{
TheNumber = num;
}
}
public class DivBySevenListener
{
public void ShowOnScreen(object o, DivBySevenEventArgs e)
{
Console.WriteLine(
"divisible by seven event raised!!! the guilty party is {0}",
e.TheNumber);
}
}
public class BusterBoy
{
public static event DivBySevenHandler EventSeven;
public static void Main()
{
DivBySevenListener dbsl = new DivBySevenListener();
EventSeven += new DivBySevenHandler(dbsl.ShowOnScreen);
GenNumbers();
}
public static void OnEventSeven(DivBySevenEventArgs e)
{
if(EventSeven!=null)
EventSeven(new object(),e);
}
public static void GenNumbers()
{
for(int i=0;i<99;i++)
{
if(i%7==0)
{
DivBySevenEventArgs e1 = new DivBySevenEventArgs(i);
OnEventSeven(e1);
}
}
}
}
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- Event handler is something defined in a class, like the sample you gave me. You can think of an Event handler as a type, like a class or a primitive type.
Class Skiepage
{
…
public
…
EventHandler<EventArgs> SelectedObjectChanged;Skiepage skiepage = new Skiepage();SelectedObjectChanged += EventConsumer_selectChanged;private void EventConsumer_selectChanged(object o, EventArgs e) }
When you consume an event handler, you usually register a method to that event handler
Class EventComumer
{
skiepage.
{
Do something;
}
}
Notice that how an EventHandler(SelectedObjectChanged) is defined in a class and how to attach a method to an event handler
