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[转载] C#面向对象设计模式纵横谈——19 Observer观察者模式

2012-09-10 17:07 295 查看
主讲：李建忠来源：http://www.microsoft.com/china/msdn/events/webcasts/shared/webcast/consyscourse/CsharpOOD.aspx









Observer
publicinterfaceIAccountObserver
{
voidUpadate();
}
publicclassATM
{
BankAccountbankAccount;
publicvoidprocess()
{
bankAccount.Withdraw(data);
}
}
publicclassBankAccount
{
ArrayList<IAccountObserver>observerList=newArrayList<IAccountObserver>();
publicvoidWithdraw(intdata)
{
//...
userAccountArgsargs=new
foreach(IAccountObserverobserverinobserverList)
{
observer.Update(args);
}
}
publicvoidAddObserver(IAccountObserverobserver)
{
observerList.Add(observer);
}
}
publicclassEmailer
{
publicvoidSendEmail(stringto)
{
//...
}
}
publicclassMobile
{
publicvoidSendNotification(stringphoneNumber)
{
//...
}
}

.csharpcode,.csharpcodepre
{
font-size:small;
color:black;
font-family:consolas,"CourierNew",courier,monospace;
background-color:#ffffff;
/*white-space:pre;*/
}
.csharpcodepre{margin:0em;}
.csharpcode.rem{color:#008000;}
.csharpcode.kwrd{color:#0000ff;}
.csharpcode.str{color:#006080;}
.csharpcode.op{color:#0000c0;}
.csharpcode.preproc{color:#cc6633;}
.csharpcode.asp{background-color:#ffff00;}
.csharpcode.html{color:#800000;}
.csharpcode.attr{color:#ff0000;}
.csharpcode.alt
{
background-color:#f4f4f4;
width:100%;
margin:0em;
}
.csharpcode.lnum{color:#606060;}

ObserverEvent
publicdelegatevoidAccountchangeEventhandler(
objectsender,
AccountChangeEventArgsargs);

publicclassBankAccount
{
publiceventAccountChangeEventHandlerAccountChange;

publicvoidWithdraw(intdata)
{
//...

AccountChangeEventArgsargs=newAccountChangeEventArgs();
foreach(IAccountObserverobserverinobserverList)
{
observer.Update(args);
}

}

protectedvirtualOnAccountChange()
{
if(AccountChange!=null)
{
AccountChange(args);
}
}
}

publicclassEmailer
{
publicvoidUpdate(objectsender,UserAccountArgsargs)
{
//...
}
}

classApp
{
publicstaticvoidMain()
{
BankAccountbankAccount=newBankAccount();

Emaileremailer=newEmailer();
bankAccount.AccountChange+=newAccountChangeEventHandler(emailer.Update)

//...
bankAccount.Withdraw(234);
}
}

.csharpcode,.csharpcodepre
{
font-size:small;
color:black;
font-family:consolas,"CourierNew",courier,monospace;
background-color:#ffffff;
/*white-space:pre;*/
}
.csharpcodepre{margin:0em;}
.csharpcode.rem{color:#008000;}
.csharpcode.kwrd{color:#0000ff;}
.csharpcode.str{color:#006080;}
.csharpcode.op{color:#0000c0;}
.csharpcode.preproc{color:#cc6633;}
.csharpcode.asp{background-color:#ffff00;}
.csharpcode.html{color:#800000;}
.csharpcode.attr{color:#ff0000;}
.csharpcode.alt
{
background-color:#f4f4f4;
width:100%;
margin:0em;
}
.csharpcode.lnum{color:#606060;}










                                            

                                        

                        
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