/// <summary>删除 观察者</summary>
/// <param name="item"></param>
public void RemoveObserver(ITemplateObserver item)
{
observers.Remove(item);
}
/// <summary>添加 观察者</summary>
/// <param name="item"></param>
public void AddObserver(ITemplateObserver item)
{
observers.Add(item);
}
