/// <summary> /// 验证码 GET: /User/ValidCode/1234 /// </summary> /// <param name="aid"></param> /// <returns></returns> public ActionResult ValidCode(string aid) { CaptchaImage ci = CaptchaImage.CreateCaptcha(aid); using (Bitmap b = ci.RenderImage()) { b.Save(Response.OutputStream, ImageFormat.Jpeg); } Response.ContentType = "image/jpeg"; Response.StatusCode = 200; Response.StatusDescription = "OK"; return(null); }