c# 上传图片到一个外链相册服务器

这里一个免费上传图片的网站：https://imgbb.com

代码：

  private void post1(string filePath)
        {

            try
            {
                string fName = new FileInfo(filePath).Name;
                string url = @"https://imgbb.com/json";
                string source = fName;
                string auth_token = "ff5ee7541280debc0674220f604c8441829a7f68";//auth_token 用抓包或者浏览器F12得到。
                string timestamp = "" + ConvertDateTimeToInt(DateTime.Now);
                string fileName = fName;

                string action = "upload";
                string type = "file";
                byte[] fileContentByte = new byte[1024]; // 文件内容二进制
                #region 将文件转成二进制

                FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read);
                fileContentByte = new byte[fs.Length]; // 二进制文件
                fs.Read(fileContentByte, 0, Convert.ToInt32(fs.Length));
                fs.Close();

                #endregion

                #region 定义请求体中的内容 并转成二进制

                string boundary = "WebKitFormBoundaryQpiD7Zd4EUOicN44";
                string Enter = "\r\n";

                string modelIdStr = "--" + boundary + Enter
                        + "Content-Disposition: form-data; name=\"source\"" + Enter + Enter
                        + source + Enter;

                string fileContentStr = "--" + boundary + Enter
                        + "Content-Type:image/jpeg" + Enter
                        + "Content-Disposition: form-data; name=\"source\"; filename=\"" + fileName + "\"" + Enter + Enter;

                string updateTimeStr = Enter + "--" + boundary + Enter
                        + "Content-Disposition: form-data; name=\"timestamp\"" + Enter + Enter
                        + timestamp;

                string enAction = Enter + "--" + boundary + Enter
                          + "Content-Disposition: form-data; name=\"action\"" + Enter + Enter
                          + action;

                string enType = Enter + "--" + boundary + Enter
                          + "Content-Disposition: form-data; name=\"type\"" + Enter + Enter
                          + type;

                string enauth_token = Enter + "--" + boundary + Enter
                        + "Content-Disposition: form-data; name=\"encrypt\"" + Enter + Enter
                        + auth_token + Enter + "--" + boundary + "--";
                var modelIdStrByte = Encoding.UTF8.GetBytes(modelIdStr);//modelId所有字符串二进制

                var fileContentStrByte = Encoding.UTF8.GetBytes(fileContentStr);//fileContent一些名称等信息的二进制（不包含文件本身）

                var updateTimeStrByte = Encoding.UTF8.GetBytes(updateTimeStr);//updateTime所有字符串二进制
                var encryptAction = Encoding.UTF8.GetBytes(enAction);//enAction所有字符串二进制

                var encryptType = Encoding.UTF8.GetBytes(enType);//enType所有字符串二进制

                var encryptStrByte = Encoding.UTF8.GetBytes(enauth_token);//encrypt所有字符串二进制

                #endregion

                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
                request.Method = "POST";
                request.ContentType = "multipart/form-data;boundary=" + boundary;

                Stream myRequestStream = request.GetRequestStream();//定义请求流

                #region 将各个二进制 安顺序写入请求流 modelIdStr -> (fileContentStr + fileContent) -> uodateTimeStr -> encryptStr

                myRequestStream.Write(modelIdStrByte, 0, modelIdStrByte.Length);

                myRequestStream.Write(fileContentStrByte, 0, fileContentStrByte.Length);
                myRequestStream.Write(fileContentByte, 0, fileContentByte.Length);
                myRequestStream.Write(updateTimeStrByte, 0, updateTimeStrByte.Length);
                myRequestStream.Write(encryptAction, 0, encryptAction.Length);
                myRequestStream.Write(encryptType, 0, encryptType.Length);

                myRequestStream.Write(encryptStrByte, 0, encryptStrByte.Length);

                #endregion

                HttpWebResponse response = (HttpWebResponse)request.GetResponse();//发送

                Stream myResponseStream = response.GetResponseStream();//获取返回值
                StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));
                string retString = myStreamReader.ReadToEnd();
                myStreamReader.Close();
                myResponseStream.Close();

                MessageBox.Show(retString);

            }
            catch(Exception ex){

                MessageBox.Show(ex.Message);
            }

        }

        /// <summary>
        /// 将c# DateTime时间格式转换为Unix时间戳格式
        /// </summary>
        /// <param name="time">时间</param>
        /// <returns>long</returns>
        public static long ConvertDateTimeToInt(System.DateTime time)
        {
            System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1, 0, 0, 0, 0));
            long t = (time.Ticks - startTime.Ticks) / 10000;   //除10000调整为13位
            return t;
        }

　　例子调用： post1("D:\\1.png");