C# 模拟POST提交文件

http://blog.csdn.net/hellowjwang/article/details/19975635


public class HttpPost

    {





        /// <summary>

        /// 以Post 形式提交数据到 uri

        /// </summary>

        /// <param name="uri"></param>

        /// <param name="files"></param>

        /// <param name="values"></param>

        /// <returns></returns>

        public static byte[] Post(Uri uri, IEnumerable<UploadFile> files, NameValueCollection values)

        {

            string boundary = "----------------------------" + DateTime.Now.Ticks.ToString("x");

            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri);

            request.ContentType = "multipart/form-data; boundary=" + boundary;

            request.Method = "POST";

            request.KeepAlive = true;

            request.Credentials = CredentialCache.DefaultCredentials;









            MemoryStream stream = new MemoryStream();





            byte[] line = Encoding.ASCII.GetBytes("\r\n--" + boundary + "\r\n");





            //提交文本字段

            if (values != null)

            {

                string format = "\r\n--" + boundary + "\r\nContent-Disposition: form-data; name=\"{0}\";\r\n\r\n{1}";

                foreach (string key in values.Keys)

                {

                    string s = string.Format(format, key, values[key]);

                    byte[] data = Encoding.UTF8.GetBytes(s);

                    stream.Write(data, 0, data.Length);

                }

                stream.Write(line, 0, line.Length);

            }





            //提交文件

            if (files != null)

            {

                string fformat = "Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\n Content-Type: application/octet-stream\r\n\r\n";

                foreach (UploadFile file in files)

                {

                    string s = string.Format(fformat, file.Name, file.Filename);

                    byte[] data = Encoding.UTF8.GetBytes(s);

                    stream.Write(data, 0, data.Length);

                    stream.Write(file.Data, 0, file.Data.Length);

                    stream.Write(line, 0, line.Length);

                }

            }









            request.ContentLength = stream.Length;









            Stream requestStream = request.GetRequestStream();





            stream.Position = 0L;

            stream.CopyTo(requestStream);

            stream.Close();





            requestStream.Close();





            using (var response = request.GetResponse())

            using (var responseStream = response.GetResponseStream())

            using (var mstream = new MemoryStream())

            {

                responseStream.CopyTo(mstream);

                return mstream.ToArray();

            }

        }





















        /// <summary>

        /// 上传文件

        /// </summary>

        public class UploadFile

        {

            public UploadFile()

            {

                ContentType = "application/octet-stream";

            }

            public string Name { get; set; }

            public string Filename { get; set; }

            public string ContentType { get; set; }

            public byte[] Data { get; set; }

        }









    }