mvc 上傳文件 nopi 處理文件流,不保存到本地

做項目遇到一個問題，怎麼不保存上傳的excel ,直接將處理結果存入數據庫，看到常用的nopi都是讀的文件流，很是頭疼。一番功夫後終於解決了

首先頁面代碼

 @using (Ajax.BeginForm(
                                    "GetFile",
                                    "MainTable",
                                     ajaxOptions: new AjaxOptions
                                     {
                                         //InsertionMode = InsertionMode.Replace,
                                         HttpMethod = "POST",
                                         OnSuccess = "alt1"
                        },
                            htmlAttributes: new
                            {
                                id = "searchFrom1",
                                Enctype = "multipart/form-data"
                                //UpdateTargetId = "_MainTableListDiv"
                            }
                    ))
                        {
                            <div class="form-group">
                                <input type="file" onchange="$('#subfile').click()" name="sd" id="file" style="display:none" />
                                <input type="button" onclick="$('#file').click()" value="上傳文件" class="btn btn-success" /> 
                                <input type="submit" id="subfile" style="display:none" class="btn btn-danger" value="提交" />
                                @Html.ActionLink("下載附件", "DownLoadFile", "MainTable",new { @class="btn btn-sussess"})
                            </div>
                        }

form 表單 內嵌文件控件，再來個按鈕模擬點擊提交

後臺代碼

 public ActionResult GetFile()
        {
            try
            {
                bool re = false;
                JavaScriptResult aScriptResult = new JavaScriptResult();
                HttpPostedFileBase aa = Request.Files[Request.Files.Count - 1];//獲得最後一個文件
                List<MainTableZi> lz = <span style="color:#ff0000;">ExcelHelper.GetList<MainTableZi></span>(aa.InputStream, "MainTableZi", "MTZ", 2, 0);//這裏是核心函數,
}
}

將excel文件導出爲集合

        /// <summary>
        /// 將excel導出爲類列表
        /// </summary>
        /// <typeparam name="T">類型</typeparam>
        /// <param name="str">文件流</param>
        /// <param name="SheetName">工作表名稱</param>
        /// <param name="FirstW">字段前綴</param>
        /// <param name="startClo">數據開始的行數(從零開始)</param>
        /// <param name="descripClo">字段描述行所在的行數</param>
        /// <returns></returns>
        public static List<T> GetList<T>(Stream str,string SheetName,string FirstW,int startClo,int descripClo)  {
            List<T> a = new List<T>();
            MemoryStream de = new MemoryStream();
            str.CopyTo(de);
            //初始化流位置
            str.Position = 0;
            de.Position = 0;
            IWorkbook workbook = null;
            try
            {
                workbook = new XSSFWorkbook(de);
            }
            catch (Exception ex)
            {
                workbook  = new HSSFWorkbook(de);
            }
            ISheet sheet = workbook.GetSheet(SheetName);
            int firstNum = startClo;//數據開始行數
            int colNameNum =descripClo;//字段行所在行數
            if (sheet.LastRowNum >= firstNum) {
                IRow row = sheet.GetRow(colNameNum);//獲得字段描述行
                for (int i = firstNum; i <= sheet.LastRowNum; i++)
                {
                    // T nt = new T();
                    T nt = Activator.CreateInstance<T>();
                    MemberInfo[] properties = nt.GetType().GetMembers();
                    for (int j = 0; j < row.LastCellNum; j++)
                    {
                       PropertyInfo pi= nt.GetType().GetProperty(FirstW+"_"+row.GetCell(j).StringCellValue);
                        if (pi != null) {
                            var ce=  sheet.GetRow(i).GetCell(j);//獲得單元格的值
                            if (ce != null) {
                                pi.SetValue(nt, ce.ToString());
                            }
                        }
                    }
                    a.Add(nt);
                }
            }
            return a;
        }

大功告成。。。