if (fileUpload.HasFile)
                {
                    string fileNameNo = Path.GetFileName(fileUpload.PostedFile.FileName); //获取文件名和扩展名
                    fileNameNo = fileNameNo.Replace("(", "-").Replace(")", "-").Replace("（", "-").Replace("）", "-");//替换
                    string filePath =System.Configuration.ConfigurationManager.AppSettings["UploadFilePath"];
                    #region 设置上传文件保存位置
                    if (!Directory.Exists(filePath))
                    {
                        Directory.CreateDirectory(HttpContext.Current.Server.MapPath(filePath));
                    }
                    DateTime today = DateTime.Now;                    
                    string saveDirectory = filePath + today.ToString("yyyy-MM-dd") + "/";
                    string saveName = DateTime.Now.ToString("yyyy-MMdd-HHmmss") + "_" +fileNameNo;
                    if (!Directory.Exists(saveDirectory))
                    {
                        Directory.CreateDirectory(HttpContext.Current.Server.MapPath(saveDirectory));
                    }
                    string fileServerPath=HttpContext.Current.Server.MapPath(saveDirectory + saveName);
                    fileUpload.PostedFile.SaveAs(fileServerPath);
                    #endregion
                    string sheetName = sheet;
                    ExcelHelper excelHelper = new ExcelHelper();
                    DataTable dt = new DataTable();
                    dt = excelHelper.ExcelImportToDataTable(fileServerPath, sheetName);
                   
}