var files = [];

                files.push({ FileName: "1.jgp", Extension: ".jgp", FileType: 2 });

                files.push({ FileName: "2.png", Extension: ".png", FileType: 2 });

                files.push({ FileName: "3.bpm", Extension: ".bpm", FileType: 2 });

                $.ajax({

                    url: "/api/file/uploadservice",

                    type: "post",

                    dataType: "json",

                    data: { "": files },

                    success: function (res) {

                        alert(res);

                    },

                    error: function (xhr ,err) {

                        alert(err);

                    }

                });

        /// <summary>

        /// 批量上传文件

        /// </summary>

        /// <param name="files"></param>

        /// <returns></returns>

        [HttpPost]

        [Route("uploadservice")]

        public HttpResponseMessage AppendFiles(List<FileInfo> files)

        {

              //上传文件处理

        }    

结果，后台中接收到的files为空

原因：jQuery的怪癖

解决：