protected virtual void OnPriceChange(PriceChangedEventArgs e)
{
if (priceChange == null)
{
return;
}
priceChange(this, e);
}
static void iphone6_PriceChanged(object sender, PriceChangedEventArgs e)
{
Console.WriteLine("年终大促销，iPhone 6 只卖 " + e.NewPrice + " 元， 原价 " + e.OldPrice + " 元，快来抢！");
}
