模拟post或get请求（c u r l），（请求里可以包含图片）

/// <summary>

/// Http上传文件类 - HttpWebRequest封装

/// </summary>

public class HttpUploadClient

{

    /// <summary>

    /// 上传执行 方法

    /// </summary>

    /// <param name="parameter">上传文件请求参数</param>

    public static string Execute(UploadParameterType parameter)

    {

        using (MemoryStream memoryStream = new MemoryStream())

        {

            // 1.分界线

            string boundary = string.Format("----{0}", DateTime.Now.Ticks.ToString("x")),       // 分界线可以自定义参数

                beginBoundary = string.Format("--{0}\r\n", boundary),

                endBoundary = string.Format("\r\n--{0}--\r\n", boundary);

            byte[] beginBoundaryBytes = parameter.Encoding.GetBytes(beginBoundary),

                endBoundaryBytes = parameter.Encoding.GetBytes(endBoundary);

            // 2.组装开始分界线数据体 到内存流中

            memoryStream.Write(beginBoundaryBytes, 0, beginBoundaryBytes.Length);

            // 3.组装 上传文件附加携带的参数 到内存流中

            if (parameter.PostParameters != null && parameter.PostParameters.Count > 0)

            {

                foreach (KeyValuePair<string, string> keyValuePair in parameter.PostParameters)

                {

                    string parameterHeaderTemplate = string.Format("Content-Disposition: form-data; name=\"{0}\"\r\n\r\n{1}\r\n{2}", keyValuePair.Key, keyValuePair.Value, beginBoundary);

                    byte[] parameterHeaderBytes = parameter.Encoding.GetBytes(parameterHeaderTemplate);

 

                    memoryStream.Write(parameterHeaderBytes, 0, parameterHeaderBytes.Length);

                }

            }

            // 4.组装文件头数据体 到内存流中

            string fileHeaderTemplate = string.Format("Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\nContent-Type: application/octet-stream\r\n\r\n", parameter.FileNameKey, parameter.FileNameValue);

            byte[] fileHeaderBytes = parameter.Encoding.GetBytes(fileHeaderTemplate);

            memoryStream.Write(fileHeaderBytes, 0, fileHeaderBytes.Length);

            // 5.组装文件流 到内存流中

            byte[] buffer = new byte[1024 * 1024 * 1];

            int size = parameter.UploadStream.Read(buffer, 0, buffer.Length);

            while (size > 0)

            {

                memoryStream.Write(buffer, 0, size);

                size = parameter.UploadStream.Read(buffer, 0, buffer.Length);

            }

            // 6.组装结束分界线数据体 到内存流中

            memoryStream.Write(endBoundaryBytes, 0, endBoundaryBytes.Length);

            // 7.获取二进制数据

            byte[] postBytes = memoryStream.ToArray();

            // 8.HttpWebRequest 组装

            HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(new Uri(parameter.Url, UriKind.RelativeOrAbsolute));

            webRequest.Method = "POST";

            webRequest.Timeout = 10000;

            webRequest.ContentType = string.Format("multipart/form-data; boundary={0}", boundary);

            webRequest.ContentLength = postBytes.Length;

            if (Regex.IsMatch(parameter.Url, "^https://"))

            {

                ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;

                ServicePointManager.ServerCertificateValidationCallback = CheckValidationResult;

            }

            // 9.写入上传请求数据

            using (Stream requestStream = webRequest.GetRequestStream())

            {

                requestStream.Write(postBytes, 0, postBytes.Length);

                requestStream.Close();

            }

            // 10.获取响应

            using (HttpWebResponse webResponse = (HttpWebResponse)webRequest.GetResponse())

            {

                using (StreamReader reader = new StreamReader(webResponse.GetResponseStream(), parameter.Encoding))

                {

                    string body = reader.ReadToEnd();

                    reader.Close();

                    return body;

                }

            }

        }

    }

    static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)

    {

        return true;

    }

}

 

        /// <summary>
        /// 上传文件 - 请求参数类
        /// </summary>
        public class UploadParameterType
        {
            public UploadParameterType()
            {
                FileNameKey = "image_file";//"fileName";
                Encoding = Encoding.UTF8;
                PostParameters = new Dictionary<string, string>();
            }
            /// <summary>
            /// 上传地址
            /// </summary>
            public string Url { get; set; }
            /// <summary>
            /// 文件名称key
            /// </summary>
            public string FileNameKey { get; set; }
            /// <summary>
            /// 文件名称value
            /// </summary>
            public string FileNameValue { get; set; }
            /// <summary>
            /// 编码格式
            /// </summary>
            public Encoding Encoding { get; set; }
            /// <summary>
            /// 上传文件的流
            /// </summary>
            public Stream UploadStream { get; set; }
            /// <summary>
            /// 上传文件 携带的参数集合
            /// </summary>
            public IDictionary<string, string> PostParameters { get; set; }
        }

 

 

调用：

  string path = Server.MapPath("/images/"); //文件夹路径
            string[] paths = Directory.GetFiles(path); //获取文件夹下全部文件路径
            for (int i = 0; i < paths.Length; i++)
            {
                using (FileStream fileStream = new FileStream(paths[i], FileMode.Open, FileAccess.Read))
                {
                //   using (FileStream fileStream = new FileStream(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "images/000000.jpg"), FileMode.Open, FileAccess.Read)) {
                string[] namea = paths[i].Split('\\');
                IDictionary<string, string> postParameter = new Dictionary<string, string>();
                postParameter.Add("api_key", "MNMUYvr81rvFSRFogoGxuVx0Xkg6PKCN");
                postParameter.Add("api_secret", "ZOzaN-1CdYhy_Qw6dtkBzaW83eNYhiNP");
                //postParameter.Add("image_url", "https://gss0.baidu.com/-4o3dSag_xI4khGko9WTAnF6hhy/zhidao/wh%3D600%2C800/sign=af933d28ccea15ce41bbe80f863016cb/a08b87d6277f9e2faba04ea51a30e924b999f382.jpg");
               // postParameter.Add("image_file", date2);
                postParameter.Add("return_landmark", "1");
                postParameter.Add("return_attributes", "gender,age,smiling,glass,headpose,facequality,blur");
                string result = HttpUploadClient.Execute(new UploadParameterType
                {
                    Url = "https://api.megvii.com/facepp/v3/detect",
                    UploadStream = fileStream,
                    FileNameValue = namea[namea.Length - 1],
                    PostParameters = postParameter
                });
               // Response.Write(result);
                
                 System.IO.File.WriteAllText(Server.MapPath("/txt/" + namea[namea.Length - 1].Split('.')[0]+".txt"), result);  // 一定要绝对路径  
             }
            }