ASP.NET Core 上传微信永久视频素材

话不多说直接上源码

请求实体

 public class AddVideoRequest
    {
        /// <summary>
        /// 文件流
        /// </summary>
        public System.IO.Stream stream { get; set; }

        /// <summary>
        /// 文件名称
        /// </summary>

        public string name { get; set; }

        /// <summary>
        /// 文件全称，带后缀
        /// </summary>
        public string file_name { get; set; }
     
        /// <summary>
        /// 字节长度
        /// </summary>
        public long length { get; set; }

        /// <summary>
        /// 视频标题
        /// </summary>
        public string title { get; set; }

        /// <summary>
        /// 视频描述
        /// </summary>
        public string describe { get; set; }
    }

上传方法
 public async Task<ResponseModel<AddMediaResponse>> AddVideo(AddVideoRequest video_request, string access_token)
        {
            try
            {
                string url = $"https://api.weixin.qq.com/cgi-bin/material/add_material?access_token={access_token}&type=video";
                HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
                CookieContainer cookieContainer = new CookieContainer();
                request.CookieContainer = cookieContainer;
                request.AllowAutoRedirect = true;
                request.Method = "POST";
                string boundary = DateTime.Now.Ticks.ToString("X"); // 随机分隔线
                request.ContentType = "multipart/form-data;charset=utf-8;boundary=" + boundary;
                byte[] itemBoundaryBytes = Encoding.UTF8.GetBytes("
--" + boundary + "
");
                byte[] endBoundaryBytes = Encoding.UTF8.GetBytes("
--" + boundary + "--
");

                //请求头部信息 
                StringBuilder sbHeader = new StringBuilder(string.Format("Content-Disposition:form-data;name="media";filename="{0}"
Content-Type:application/octet-stream

", video_request.file_name));
                byte[] postHeaderBytes = Encoding.UTF8.GetBytes(sbHeader.ToString());

                Stream fs = video_request.stream;
                byte[] bArr = new byte[fs.Length];
                fs.Read(bArr, 0, bArr.Length);
                fs.Close();
                Stream postStream = await request.GetRequestStreamAsync();
                postStream.Write(itemBoundaryBytes, 0, itemBoundaryBytes.Length);
                postStream.Write(postHeaderBytes, 0, postHeaderBytes.Length);
                postStream.Write(bArr, 0, bArr.Length);
                postStream.Write(Encoding.UTF8.GetBytes("--" + boundary + "
"));
                postStream.Write(Encoding.UTF8.GetBytes("Content-Disposition: form-data; name="description";

"));
                postStream.Write(Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(new { title = video_request.title, introduction = video_request.describe })));
                postStream.Write(endBoundaryBytes, 0, endBoundaryBytes.Length);
                HttpWebResponse response = await request.GetResponseAsync() as HttpWebResponse;
                Stream instream = response.GetResponseStream();
                StreamReader sr = new StreamReader(instream, Encoding.UTF8);
                string content = sr.ReadToEnd();
                var res = JsonConvert.DeserializeObject<AddMediaResponse>(content);

                return new ResponseModel<AddMediaResponse>
                {
                    success = res.errcode == 0,
                    data = res,
                    error_message = res.errmsg,
                    body = content
                };
            }
            catch (Exception ex)
            {
                return new ResponseModel<AddMediaResponse> { success = false, error_message = ex.Message };
            }
        }