使用Ajax与formData实现文件上传

.CSHTML


<div style="float:left">
                            @Html.ActionLink("XXX模板", "DownloadTemplateFile", null, new { target = "_blank", @class = "sel_btn2 ch_cls2" })
                        </div>
                        <div style="margin-left:10px; float:left">
                            <span class="w_72 a_r">选择文件：</span>
                            <span>
                                <input type="file" name="fileToUpload" size="50" value="" id="fileToUpload" />
                                <input class="search_button_bg_1 color_fff w_65 h_27 bd_none l_s_5" type="submit" value="导入数据" onclick="beforeUpload();" />
                            </span>
                        </div>



JS：

 function beforeUpload() {
            var formData = new FormData();
            formData.append("fileToUpload", document.getElementById("fileToUpload").files[0]);
            $.ajax({
                url: '@Url.Action("UploadFile", "XXXMainTable")',
                type: "POST",
                data: formData,
                    processData: false,  // 不处理数据********必添加 
                    contentType: false,   // 不设置内容类型********必添加 
                    success: function (data) {
                        if (data.Success) {
                            alert(data.Message);