/// <summary>
/// 生成小图片
/// </summary>
/// <param name="Id"></param>
/// <param name="size"></param>
/// <param name="flg"></param>
/// <returns></returns>
public bool set_thumbs_img(int Id, int size, string flg)
{
Img img = new Img();
ProductInfo info = read(Id);
return img.MakeThumbnail(System.Web.HttpContext.Current.Server.MapPath(info.productImgUrl),
cimg(System.Web.HttpContext.Current.Server.MapPath(info.productImgUrl), flg), size, size, "save");
}