/// <summary>
/// 获取指定附件id的相关附件信息
/// </summary>
/// <param name="aid">附件id</param>
/// <returns>附件信息</returns>
public static Goodsattachmentinfo GetGoodsAttachmentsByAid(int aid)
{
return(DTO.GetGoodsattachmentInfo(DbProvider.GetInstance().GetGoodsAttachmentsByAid(aid)));
}