C#实现POST上传图片到服务器

   public static string MyHttpPost(string Url, string postDataStr)
        {
            Stream oStream;
            BinaryReader oReader;

            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);
            request.Method = "POST"; 
            request.ContentType = "application/x-www-form-urlencoded;charset=utf-8";//表头的格式必须要写,否则请求响应的页面得不到要传递的值 
            byte[] SomeBytes = Encoding.ASCII.GetBytes(postDataStr);//传递的值 


            oStream = new FileStream(@"E:/Work/SC58Service/SC58Service/Styles/n_s02611398469419728014.jpg", FileMode.Open, FileAccess.Read); oReader = new BinaryReader(oStream);
            byte[] imgdata = oReader.ReadBytes(Convert.ToInt32(oStream.Length));byte[] data = new byte[postDataStr.Length + imgdata.Length];
            SomeBytes.CopyTo(data, 0);
            imgdata.CopyTo(data, postDataStr.Length);
          


            request.ContentLength = SomeBytes.Length;
            Stream newStream = request.GetRequestStream();//把传递的值写到流中   
            newStream.Write(SomeBytes, 0, SomeBytes.Length);
            newStream.Close();//必须要关闭请求
            HttpWebResponse httpWebResponse = null;
            httpWebResponse = (HttpWebResponse)request.GetResponse();
            Stream s = httpWebResponse.GetResponseStream();
            StreamReader reader = new StreamReader(s, Encoding.GetEncoding("utf-8"));
            string respText = reader.ReadToEnd();
            s.Close();
            return respText;
        }