//寄送報紙
public void SendNewspaper(Newspaper_MulticastDelegete newspaper)
{
newspaper.PublisherName = this.Name;
//使用委託
if (_Subscribers != null)
{
//_Subscribers(newspaper);
//如果在多播委託時產生例外:
//將_Subscribers中的調用委託函數列表迭代出來
foreach (Subscribers hander in _Subscribers.GetInvocationList())
{
try
{
//每一個元素都是Subscribers類型函數，調用hander(參數);
hander(newspaper);
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
}
}
}
public void SendNewsPaper(NewsPaper newsPaper)
{
//newsPaper.publisherName = this.name;
//这是一股脑的处理，没法处理异常
//使用委托
//subscribers?.Invoke(newsPaper);//Event?.Invoke() 若event不为null，则baiinvoke，这是C#6的新语法du。zhi ?.称为空值传dao播运算符。
//异常处理方法
if (Subscribers != null)
{
//转为list一个一个处理
foreach (EventHandler <PublisherArgs> subscriber in Subscribers.GetInvocationList())
{
try
{
subscriber(this, new PublisherArgs(newsPaper));
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
}
}
}