/// <summary>
/// 判断手机用户UserAgent
/// </summary>
/// <returns></returns>
private bool IsMobile()
{
  HttpContext context = HttpContext.Current;
  if (context != null)
  {
    HttpRequest request = context.Request;
    if (request.Browser.IsMobileDevice)
      return true;
    string MobileUserAgent=System.Configuration.ConfigurationManager.AppSettings["MobileUserAgent"];
    Regex MOBILE_REGEX = new Regex(MobileUserAgent);
    if (string.IsNullOrEmpty(request.UserAgent) || MOBILE_REGEX.IsMatch(request.UserAgent.ToLower()))
      return true;
  }
  return false;
}