/// <summary>
 /// 将form的action换成绝对路径
 /// </summary>
 public static void FormatForm()
 {
     ((System.Web.UI.Page)HttpContext.Current.CurrentHandler).Form.Action = RequestUtil.GetVirPath();
 }
 /// <summary>
 /// 在网页页面返回空图片
 /// </summary>
 public static void ImageNoSign()
 {
     Image(RequestUtil.GetPath("~/Img/NoPic.jpg"));
 }