asp.net webapi 多文件上传

使用enctype="multipart/form-data"来进行操作

        /// <summary>
        /// 上传图片
        /// </summary>
        /// <returns></returns>
        [HttpPost]
        [Token]
        [Route("User/Upload")]
        public async Task<HttpResponseMessage> Upload()
        {
            APIUpload apiUpload = new APIUpload();
            var provider = await Request.Content.ReadAsMultipartAsync();
            List<string> uploadedImages = new List<string>(provider.Contents.Count);
            foreach (var item in provider.Contents)
            {
                if (item.Headers.ContentDisposition.FileName != null)
                {
                    var data = await item.ReadAsByteArrayAsync();
                    //将流存放到阿里oss
                    string imageUrl = apiUpload.SavePlayImage(data);
                    ZBBlackboard blackboard = new ZBBlackboard();
                    uploadedImages.Add(imageUrl);
                }
            }
            List<ZBBlackboard> blackboards = new List<ZBBlackboard>(uploadedImages.Count);
            using (CMSDataContext context = DataContextFactory.CreateCMS())
            {
                int maxId = 0;
                if (context.ZBBlackboard.Count() != 0)
                {
                    maxId = context.ZBBlackboard.Max(b => b.ID);
                }
                foreach (string imageUrl in uploadedImages)
                {
                    ZBBlackboard blackboard = new ZBBlackboard();
                    blackboard.ID = ++maxId;
                    blackboard.ImgUrl = imageUrl;
                    blackboards.Add(blackboard);
                }
                context.ZBBlackboard.InsertAllOnSubmit<ZBBlackboard>(blackboards);
                context.SubmitChanges();
            }
            string token = LoginStatusHelper.GetNewLoginStatus(this.Request);
            return this.Request.CreateResponse<APIResponseData>(APIResponseData.GetResponse(200, data: new { Images = blackboards }, token: token));
        }