public BannerItem ChangeItem(BannerItemChangeCommand command)
{
if (BannerItems == null)
{
BannerItems = new List <BannerItem>();
}
BannerItem bannerItem = BannerItems.FirstOrDefault(p => p.Id == command.Id);
if (bannerItem == null)
{
throw new Exception("BannerItem not found.");
}
bannerItem.Change(command);
AddEvent(this.ToAddOrChangCacheEvent());
return(bannerItem);
}
