void BarcodePaperLayout_PaperLayoutChanged(object sender, PaperLayoutChangedEventArgs e)
{
LoadPageSetting();
//throw new NotImplementedException();
}
public virtual void OnPaperLayoutChanged(PaperLayoutChangedEventArgs e)
{
if (PaperLayoutChanged != null)//如果有对象注册，就调用。
PaperLayoutChanged(this, e);
}