C#实现文件异步上传

//前台方法，包含弹出框确认以及文件选择
<input type="button" id="importxlsx" name="importxlsx" class="k-button" style="line-height: 20px" value="@T("Admin.Common.ImportFromExcel")" />

<div id="importexcel-window" style="display:none;">
    @using (Html.BeginForm("ImportExcel", "ProductCarrefour", FormMethod.Post, new { name = "ImportExcelForm", enctype = "multipart/form-data" }))
    {
        <table style="text-align:left;">
            @*<tr>
                    <td colspan="">
                        <em>@T("Admin.Catalog.Products.List.ImportFromExcelTip")</em>
                    </td>
                </tr>*@
            <tr>
                <td>
                    @T("Admin.Common.ZIPFile"):
                </td>
                <td>
                    <input type="file" id="importexcelfile" name="importexcelfile" />
                </td>
            </tr>
            <tr>
                <td colspan="">
                    <strong>@T("Admin.Configuration.File.MaxLengthFor200")</strong>
                    <br />
                    <strong>@T("Admin.Configuration.Languages.XmlFile.Note1")</strong>
                    <br />
                    <strong>@T("Admin.Configuration.Languages.XmlFile.Note2")</strong>
                </td>
            </tr>
            <tr>
                <td colspan="">
                    <input type="button" class="k-button" onclick="checkIsExcel(this)" value="@T("Carrefour.Admin.Controllers.GoodsController.ImportZIP")" />
                    @*<input type="submit" id="ExcelInEnsure" style="display: none" />*@
                    @*<input type="submit" class="k-button" value="@T("Admin.Common.ImportFromExcel")" />*@
                </td>
            </tr>
        </table>
    }
</div>
<script type="text/javascript">
    function checkIsExcel(v)
    {
        var ImportExcelForm = $("#ImportExcelForm");

        var file = $("#importexcelfile").val();

        if(file=="")
        {
            alert("請選擇文件");
            return;
        }
        var strTemp = file.split(".");
        var strCheck = strTemp[strTemp.length-];

        if(strCheck.toUpperCase()=='ZIP'||strCheck.toUpperCase()=='zip')
        {
            //$("#ExcelInEnsure").trigger("click");
            submitImportProduct();
        }else
        {
            alert('上傳文件類型不對！');
            return;
        }
    }
    function submitImportProduct() {
        debugger;
        var formData = new FormData();
        formData.append("importexcelfile", $("#importexcelfile")[].files[]);
        $.ajax({
            type: 'POST',
            url: '@Url.Action("ImportExcel", "Product")',
            data: formData,
            cache: false,
            contentType: false,
            processData: false,
            success: function (data) {
                return false;
            }
        });
        $("#importexcel-window").data("kendoWindow").close();
        alert("文件正在異步上傳，請在上傳記錄中查看上傳狀態。")
        window.open("@storeLocation" + "admin/common/UploadLogList");
        return false;
    }
</script>
<script type="text/javascript">
    $(document).ready(function () {
        $("#importexcel").click(function (e) {
            e.preventDefault();
            var window = $("#importexcel-window");
            if (!window.data("kendoWindow")) {
                window.kendoWindow({
                    modal: true,
                    width: "400px",
                    title: "@T("Admin.Common.ImportFromZIP")",
                    actions: ["Close"]
                });
            }
            window.data('kendoWindow').center().open();
        });
    });
</script>

//后台方法
[HttpPost]
        public ActionResult ImportExcel()
        {
            if (!_permissionService.Authorize(StandardPermissionProvider.ManageProducts) && !_permissionService.Authorize(StandardPermissionProvider.ManageVendorProducts))
                return AccessDeniedView();

            var deleteZipFile = _settingService.GetSettingByKey("productimport.deleteproductzipfile", false);
            string tempFileName = CommonHelper.GetDateTimeNow().ToString("yyyyMMddHHmmssfff");
            var file = Request.Files["importexcelfile"];
            var flagFile = Server.MapPath("~/Administration//Template//" + Path.GetFileNameWithoutExtension(file.FileName));

            if (System.IO.File.Exists(flagFile))
            {
                ErrorNotification(string.Format(_localizationService.GetResource("Admin.Catalog.Products.FileOnUploading"), file.FileName));
                return RedirectToAction("List");
            }
            FileStream myFs = new FileStream(flagFile, FileMode.Create);
            myFs.Close();

            string filePath = Server.MapPath("~/Administration//Template//" + tempFileName + ".zip");
            string backupPath = Server.MapPath("~/Administration//BackupFiles//ProductImportZipFiles//");
            string dir = Server.MapPath("~/Administration//Template//" + tempFileName + "");
            try
            {
                file.SaveAs(filePath);
                if (!Directory.Exists(Server.MapPath("~/Administration//Template//" + tempFileName + "")))
                {
                    // Create the directory it does not exist.
                    Directory.CreateDirectory(Server.MapPath("~/Administration//Template//" + tempFileName + ""));
                }

                //如果解压缩成功
                if (CopyToAndUnzipFile(filePath, tempFileName))
                {
                    DirectoryInfo dirinfo = new DirectoryInfo(Server.MapPath("~/Administration//Template//" + tempFileName + ""));
                    var afileinfo = dirinfo.GetFiles();
                    List<string> excelCount = (from fi in afileinfo where Path.GetExtension(fi.Name).ToUpper() == ".XLS" || Path.GetExtension(fi.Name).ToUpper() == ".XLSX" select fi.FullName).ToList();
                    if (excelCount.Count == )    //如果只存在一个excel文件
                    {

                        using (FileStream fileStream = new FileStream(excelCount[], FileMode.Open, FileAccess.Read))
                        {

                            _importManager.ImportProductsFromXlsxAsync(fileStream, Server.MapPath("~/Administration//Template//" + tempFileName + ""), file.FileName, filePath, deleteZipFile, flagFile, backupPath, dir);

                        }

                        return RedirectToAction("List");
                        //}
                    }
                    if (excelCount.Count > )
                    {
                        ErrorNotification(_localizationService.GetResource("Admin.Catalog.Products.ImportProductAndGoodsExistOneMoreExcel"));
                    }
                    else if (excelCount.Count == )
                    {
                        ErrorNotification(_localizationService.GetResource("Admin.Catalog.Products.ImportProductAndGoodsExistZeroExcel"));
                    }
                }

                return RedirectToAction("List");
            }
            catch (Exception exc)
            {

                TempData["ErrorMsg"] = exc.Message;

                if (exc.InnerException != null)
                {
                    string logError = string.Format("商品導入出錯,error:{0}", exc.InnerException.InnerException);
                    _logger.InsertLog(LogLevel.Error, logError, logError);
                }

                return RedirectToAction("List");
            }
        }