using
System;
using
System.Collections.Generic;
using
System.Text;
namespace
ImplementInterfaceEvents{
interface
IDrawingObject {
event
EventHandler ShapeChanged; }
public
class
MyEventArgs : EventArgs {
private
string
dispalyMsg;
public
string
DispalyMsg {
get
{
return
dispalyMsg; } }
public
MyEventArgs() :
this
(
string
.Empty) { }
public
MyEventArgs(
string
msg) {
this
.dispalyMsg
=
msg; } }
public
class
Shape : IDrawingObject {
public
event
EventHandler ShapeChanged;
public
void
ChangeShape() { Console.WriteLine(
"
Do something here before the event…
"
); OnShapeChanged(
new
MyEventArgs(
"
hello
"
)); Console.WriteLine(
"
or do something here after the event .
"
); }
protected
virtual
void
OnShapeChanged(MyEventArgs e) {
if
(ShapeChanged
!=
null
) { ShapeChanged(
this
, e); } } }
public
class
TestDemo {
static
void
Main(
string
[] args) { Shape s
=
new
Shape(); s.ShapeChanged
+=
new
EventHandler(s_ShapeChanged); s.ChangeShape(); Console.ReadLine(); }
static
void
s_ShapeChanged(
object
sender, EventArgs e) { Console.WriteLine(((MyEventArgs)e).DispalyMsg); Console.WriteLine(
"
s_ShapeChanged
"
); } }}
转载于:https://www.cnblogs.com/fightLonely/archive/2011/02/17/1957064.html
