<form class="form-horizontal form-bordered form-row-strippe"  enctype="multipart/form-data" method="post" name="fileinfo" id="fileinfo" data-toggle="validator">

                <div class="modal-body">

                    <div class="form-horizontal">

                        <div class="control-group">

                            <label class="control-label" style="width: 125px;">

                                审批项目名称：</label>

                            <div class="controls" style="margin-left: 0px;">

                                <input type="text" id="id" name="id" style="display:none;" value="$id$" />

                                <input type="text" id="projectname" name="projectname" class="m-wrap large" value="$projectname$" />

                            </div>

                        </div>

                        <div class="control-group">

                            <label class="control-label" style="width: 125px;">

                                审批项目说明：</label>

                            <div class="controls" style="margin-left: 0px;">

                                <input class="m-wrap large" type="text" id="projectinfo" name="projectinfo" value="$projectinfo$" />

                            </div>

                        </div>

                        <div class="control-group">

                            <label class="control-label" style="width: 125px;">

                                审批项目文件：</label>

                            <div class="controls" style="margin-left: 0px;">

                                <input type="file" id="filepath" name="filepath" style="display:none" onchange="changetext()" />

                                <input class="m-wrap" type="text" id="pathfile" name="pathfile" readonly="readonly" value="$filepath$" />

                                <input class="btn green" type="button" value="选择文件" id="uploadpath" />

                            </div>

                        </div>

                    </div>

                </div>

                <div class="modal-footer bg-info">

                    <input class="btn blue" type="button" id="btnsubmit" value="提交" onclick="update()" data-dismiss="modal" />

                    <button type="button" class="btn green" data-dismiss="modal">

                        取消</button>

                </div>

            </form>

 <script type="text/javascript">

     jQuery(document).ready(function () {

         $('#uploadpath').click('click', function () {

             $('#filepath').trigger('click');

         });

     })

     function changetext()

     {

         if ($("#filepath").val() == "") {

             //当用户没有选择文件时,不修改原有路径

         }

         else {

             $("#pathfile").val($("#filepath").val());

         }

     }

     function update() {

         var projectname = $("#projectname").val();

         var projectinfo = $("#projectinfo").val();

         var filepath = $("#pathfile").val();

         //var formData = new FormData($("#fileinfo")[0]);//两者皆可

         var formData = new FormData(document.forms.namedItem("fileinfo"));

         formData.append("id", $id$);

         $.ajax({

             url: "/ApprovalProcessNoView/queryeditproject",

             type: "POST",

             data: formData,

             async: false,

             cache: false,

             contentType: false,

             processData: false,

             success: function (data) {

                 alert(data.msg);

             },

             error: function (data) {

                 alert(data.msg);

             }

         });

     }

 </script>

 returnresult rr = new returnresult();

             string projectname = Request.Form["projectname"];

             string projectinfo = Request.Form["projectinfo"];

             HttpPostedFileBase pathfile = Request.Files["filepath"];

             long id = Request.Form["id"].ToLong();

             string path = "/UF/Uploads/myfile";

             //获取上传目录 转换为物理路径

             string uploadPath = Server.MapPath(path);

             //判断目录是否存在

             if (!Directory.Exists(uploadPath))

             {

                 Directory.CreateDirectory(uploadPath);

             }

             //保存文件的物理路径

             string saveFile = uploadPath + pathfile.FileName;

             //保存图片到服务器

             try

             {

                 pathfile.SaveAs(saveFile);

                 rr.status = true;

             }

             catch (Exception)

             {

                 rr.status = false;

                 rr.msg = "文件上传失败";

             }