ajaxfileupload上传

   //上传图标
        function ajaxFileUpload() {
            $.ajaxFileUpload({
                url: "@Url.Action("UploadImgFile", "Upload")", //用于文件上传的服务器端请求地址
                secureuri: false, //一般设置为false
                fileElementId: $("input[name=file_upload]"), //文件上传空间的id属性
                dataType: "text", //返回值类型
                success: function (data, status) {  //服务器成功响应处理函数
                    var data2 = JSON.parse(data);
                    if (data2.ResultType == "@OperationResultType.Success.ToInt32()") {
                        $("input[name=Icon]").val(data2.ResultMessage);
                        $("label.img-label").text("重传");
                    }
                    else {
                        showMessage(data2.ResultMessage);
                    }
                },
                error: function (data, status, e) {//服务器响应失败处理函数
                    showMessage("服务器未响应");
                }
            });
            return false;
        }

   /// <summary>
        /// 浏览上传文件
        /// </summary>
        /// <param name="file_upload">文件</param>
        /// <returns></returns>
        public ContentResult UploadImgFile(HttpPostedFileBase file_upload)
        {
            OperationResult result;
            if (file_upload == null)
            {
                result = new OperationResult(OperationResultType.Error, "请选择要上传的图片");
            }
            else
            {
                var fileExtension = Path.GetExtension(file_upload.FileName).ToLower();
                if (!WebConfigInfo.ImageSupportType.Contains(fileExtension))
                {
                    result = new OperationResult(OperationResultType.Error, "请上传" + WebConfigInfo.ImageSupportType+"格式的图片");
                }
                else if (file_upload.ContentLength > Convert.ToInt32(WebConfigInfo.IconFileSizeLimit.Remove(WebConfigInfo.IconFileSizeLimit.LastIndexOf(' '))) * 1024)
                {
                    result = new OperationResult(OperationResultType.Error, "请上传最大不超过" + WebConfigInfo.IconFileSizeLimit+"的图片");
                }
                else
                {
                    string path = "/upload/" + DateTime.Now.ToString("yyyyMMdd");
                    string uploadDir = Server.MapPath(WebConfigInfo.VirtualDirectoryName + path);

                    // 如果上传课程文件夹不存在，则创建
                    if (!Directory.Exists(uploadDir))
                        Directory.CreateDirectory(uploadDir);
                    string fileUrl = string.Format("{0}/{1}{2}", path, Guid.NewGuid().ToString().Replace("-", string.Empty), fileExtension);
                    file_upload.SaveAs(Server.MapPath(WebConfigInfo.VirtualDirectoryName + fileUrl));
                    result = new OperationResult(OperationResultType.Success, fileUrl);
                }
            }
            var json = string.Format("{0}"ResultType":"{1}","ResultMessage":"{2}"{3}", "{", result.ResultType.ToInt32(), result.Message, "}");
            return Content(json);
        }