HttpWebRequest 上传文件

            //边界

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

            HttpWebRequest uploadRequest = (HttpWebRequest)WebRequest.Create(url);//url为上传的地址

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

            uploadRequest.Method = "POST";

            uploadRequest.Accept = "*/*";

            uploadRequest.KeepAlive = true;

            uploadRequest.Headers.Add("Accept-Language", "zh-cn");

            uploadRequest.Headers.Add("Accept-Encoding", "gzip, deflate");

            uploadRequest.Credentials = System.Net.CredentialCache.DefaultCredentials;

            uploadRequest.Headers["Cookie"] = cookies;//上传文件时需要的cookies



            WebResponse reponse;

            //创建一个内存流

            Stream memStream = new MemoryStream();



            //确定上传的文件路径

            if (!String.IsNullOrEmpty(file))

            {

                boundary = "--" + boundary;



                //添加上传文件参数格式边界

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

                NameValueCollection param = new NameValueCollection();

                param.Add("fname", Guid.NewGuid().ToString() + Path.GetExtension(file));

               

                //写上参数

                foreach (string key in param.Keys)

                {

                    string formitem = string.Format(paramFormat, key, param[key]);

                    byte[] formitembytes = System.Text.Encoding.UTF8.GetBytes(formitem);

                    memStream.Write(formitembytes, 0, formitembytes.Length);

                }



                //添加上传文件数据格式边界

                string dataFormat = boundary + "\r\nContent-Disposition: form-data; name=\"{0}\";filename=\"{1}\"\r\nContent-Type:application/octet-stream\r\n\r\n";

                string header = string.Format(dataFormat, "Filedata", Path.GetFileName(file));

                byte[] headerbytes = System.Text.Encoding.UTF8.GetBytes(header);

                memStream.Write(headerbytes, 0, headerbytes.Length);



                //获取文件内容

                FileStream fileStream = new FileStream(file, FileMode.Open, FileAccess.Read);

                byte[] buffer = new byte[1024];

                int bytesRead = 0;



                //将文件内容写进内存流

                while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)

                {

                    memStream.Write(buffer, 0, bytesRead);

                }

                fileStream.Close();



                //添加文件结束边界

                byte[] boundarybytes = System.Text.Encoding.UTF8.GetBytes("\r\n\n" + boundary + "\r\nContent-Disposition: form-data; name=\"Upload\"\r\n\nSubmit Query\r\n" + boundary + "--");

                memStream.Write(boundarybytes, 0, boundarybytes.Length);



                //设置请求长度

                uploadRequest.ContentLength = memStream.Length;

                //获取请求写入流

                Stream requestStream = uploadRequest.GetRequestStream();

               



                //将内存流数据读取位置归零

                memStream.Position = 0;

                byte[] tempBuffer = new byte[memStream.Length];

                memStream.Read(tempBuffer, 0, tempBuffer.Length);

                memStream.Close();



                //将内存流中的buffer写入到请求写入流

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

                requestStream.Close();

            }



            //获取到上传请求的响应

            reponse = uploadRequest.GetResponse();

作者：Louja
出处：http://loujady.cnblogs.com
本文版权归作者和博客园共有，欢迎转载，但未经作者同意必须保留此声明，且在文章页面给出原文连接，否则保留追究法律责任的权利。