HttpWebRequest上传图片问题。

        public void getUp()

        {

            String fileToUpload = "c:\\1.jpg";

            String uploadUrl = "https://www.ganji.com/swftool/uploader2/includes/upload.php";

            String fileFormName = "file";

            String contenttype = "gif,jpg,jpeg,png,bmp";

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



            HttpWebRequest webrequest = (HttpWebRequest)WebRequest.Create(uploadUrl);

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

            webrequest.Method = "POST";

            webrequest.CookieContainer = myCookieContainer;

            StringBuilder sb = new StringBuilder();

            sb.Append("--");

            sb.Append(boundary);

            sb.Append("\r\n");

            sb.Append("Content-Disposition: form-data; name=\"");

            sb.Append(fileFormName);

            sb.Append("\"; filename=\"");

            sb.Append(Path.GetFileName(fileToUpload));

            sb.Append("\"");

            sb.Append("\r\n");

            sb.Append("Content-Type: ");

            sb.Append(contenttype);

            sb.Append("\r\n");

            sb.Append("\r\n");



            string postHeader = sb.ToString();

            byte[] postHeaderBytes = Encoding.UTF8.GetBytes(postHeader);

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

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

            long length = postHeaderBytes.Length + fileStream.Length + boundaryBytes.Length;

            webrequest.ContentLength = length;

            Stream requestStream = webrequest.GetRequestStream();

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



            byte[] buffer = new Byte[(int)fileStream.Length];

            int bytesRead = 0;

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

                requestStream.Write(buffer, 0, bytesRead);

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

            requestStream.Close();

        }

补充：.NET技术 ,  C#

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