asp.net mvc 导入 ajax excel,或者图片上传 后台不能接收的问题

做如图所示功能,ajax上传excel文件到后台解析.
提交到后台总是获取不到文件,有连个参数需要添加.
processData: false,
contentType: false,
没有这两个参数要么报错,要么后台接收不了文件.

下面贴下代码

 $.ajax({
            url: "/CustomerManage/CustomerUser/ExcelImportData",
            type: 'POST',
            data: data,
            dataType: 'JSON',
            processData: false,
            contentType: false,
            beforeSend: function () {
                debugger;
                $.loading(true, options.loading);
            },
            success: function (data) {
                if (data == "Success") {
                    //清空输入框

                }
            },  
            complete: function () {
                $.loading(false);
            },
            error: function (XMLHttpRequest, textStatus, errorThrown) {
                $.loading(false);
                $.modalMsg(errorThrown, "error");
            }
        });

控制器代码

  [HttpPost]
        public ActionResult ExcelImportData()
        {
            List<CRM.Model.customer> list = new List<CRM.Model.customer>();
            HttpPostedFileBase fostFile = Request.Files["file1"];
            DataTable table = Command.Excel.ExcelHelper.ExcelImport(fostFile);
            string ret = userBLL.ExcelImport(table);
            return Content(ret);
        }

表格解析代码

 public static DataTable ExcelImport(HttpPostedFileBase postFile)
        {
            DataTable dt = new DataTable();
            Stream streamfile = postFile.InputStream;
            ISheet sheet = null;

            if (postFile.FileName.IndexOf(".xlsx") == -1)//2003
            {
                HSSFWorkbook hssfworkbook = new HSSFWorkbook(streamfile);
                sheet = hssfworkbook.GetSheetAt(0);
            }
            else//2007
            {
                XSSFWorkbook xssfworkbook = new XSSFWorkbook(streamfile);
                sheet = xssfworkbook.GetSheetAt(0);
            }


            System.Collections.IEnumerator rows = sheet.GetRowEnumerator();

            IRow headerRow = sheet.GetRow(0);
            int cellCount = headerRow.LastCellNum;

            for (int j = 0; j < cellCount; j++)
            {
                ICell cell = headerRow.GetCell(j);
                dt.Columns.Add(cell.ToString());
            }

            for (int i = (sheet.FirstRowNum + 1); i <= sheet.LastRowNum; i++)
            {
                IRow row = sheet.GetRow(i);
                DataRow dataRow = dt.NewRow();

                for (int j = row.FirstCellNum; j < cellCount; j++)
                {
                    if (row.GetCell(j) != null)
                        dataRow[j] = row.GetCell(j).ToString();
                }

                dt.Rows.Add(dataRow);
            }
            return dt;
        }

前端,控制器,都有了,现在不差啥了.
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