[HttpPost] public string UploadImage() { //string ss = Request.Form["uploadFile"]; //return ss; HttpPostedFileBase uploadFile = Request.Files[0]; string fileName = uploadFile.FileName; int fileSize = uploadFile.ContentLength; string fileExt = Path.GetExtension(fileName).ToLower(); string message = ""; if (!(fileExt == ".png" || fileExt == ".gif" || fileExt == ".jpg" || fileExt == ".jpeg")) { message = "图片类型只能为gif,png,jpg,jpeg"; return message; } else { if (fileSize > (int)(500 * 1024)) { message = "图片大小不能超过500KB"; return message; } else { Random r = new Random(); string uploadFileName = DateTime.Now.ToString("yyyyMMddhhmmss") + r.Next(100000, 999999) + fileExt; try { string directoryPath = Server.MapPath("~/UploadImages/"); if (!Directory.Exists(directoryPath))//不存在这个文件夹就创建这个文件夹 { Directory.CreateDirectory(Server.MapPath("~/UploadImages/")); } uploadFile.SaveAs(Server.MapPath("~/UploadImages/") + uploadFileName); message = uploadFileName; return message; } catch (Exception ex) { message = ex.Message; return message; } } } }