微信摇一摇上传图片素材

/// <summary>
        /// 微信摇一摇上传图片素材 图片大小建议120px*120 px，限制不超过200 px *200 px，图片需为正方形。
        /// </summary>
        /// <param name="data">文件流</param>
        /// <param name="fileName">文件名</param>
        /// <returns></returns>
        public async Task<WxBaseResponse<UploadImgResponse>> UploadImg(byte[] data, string fileName)
        {
            var accessToken = await GetAccessToken();
            var url = $"{wxApi}/shakearound/material/add?access_token={accessToken}";
            // 设置参数
            string boundary = DateTime.Now.Ticks.ToString("X"); // 随机分隔线
            var content = new MultipartFormDataContent(boundary);
            content.Headers.Remove("Content-Type");
            content.Headers.TryAddWithoutValidation("Content-Type", "multipart/form-data; boundary=" + boundary);
            var contentByte = new ByteArrayContent(data);
            contentByte.Headers.Remove("Content-Disposition");
            contentByte.Headers.TryAddWithoutValidation("Content-Disposition", $"form-data; name="media";filename="{fileName}_2.png"" + "");
            contentByte.Headers.Remove("Content-Type");
            contentByte.Headers.TryAddWithoutValidation("Content-Type", "image/png");
            content.Add(contentByte);
            return await HttpClientHelper.PostFileAsync<WxBaseResponse<UploadImgResponse>>(url, content);
            //return await _httpApi.PostAsync<WxBaseResponse<UploadImgResponse>>(url, content);
        }

public static async Task<T> PostFileAsync<T>(string url, HttpContent content)
        {
            using (var httpClient = new HttpClient())
            {
                var uri = new Uri(url);
                var resp = await httpClient.PostAsync(uri, content);
                var jsonResult = Encoding.UTF8.GetString(await resp.Content.ReadAsByteArrayAsync());
                return JsonConvert.DeserializeObject<T>(jsonResult);
            }
        }

api,FormData上传调用：

var count = Request.Form.Files.Count;
            if (count == 0 || count > 1)
            {
                return Ok(ActionResponse.Fail(-1, "没有文件上传或者上传文件数大于1"));
            }
            var file = Request.Form.Files[0];
            var imgUrl = "";
            using (var br = new BinaryReader(file.OpenReadStream()))
            {
                byte[] data = br.ReadBytes((int)file.OpenReadStream().Length);
                var wxResponse = await _wxService.UploadImg(data, file.FileName);
                if (wxResponse.IsSuccess)
                    imgUrl = wxResponse.Data.PicUrl;
                else return Ok(ActionResponse.Fail(-1, $"上传文件出错:{wxResponse.Message},错误码：{wxResponse.Code}"));
            }