C#远程发送和接收数据流生成图片的方法

/// <summary>
/// PostBinaryData
/// </summary>
/// <param name="url">要发送的 url 网址</param>
/// <param name="bytes">要发送的数据流</param>
/// <returns></returns>
public string PostBinaryData(string url,byte[] bytes)
{
  //下面是测试例子
  //string url = "http://www.test.com/test.ashx";
  //string img = HttpContext.Current.Server.MapPath("../images/test.jpg");
  //byte[] bytes = File.ReadAllBytes(img);
  HttpWebRequest wRequest = (HttpWebRequest)WebRequest.Create(url);
  wRequest.ContentType = "multipart/form-data";
  wRequest.ContentLength = bytes.Length;
  wRequest.Method = "POST";
  Stream stream = wRequest.GetRequestStream();
  stream.Write(bytes,bytes.Length);
  stream.Close();
  HttpWebResponse wResponse = (HttpWebResponse)wRequest.GetResponse();
  StreamReader sReader = new StreamReader(wResponse.GetResponseStream(),System.Text.Encoding.UTF8);
  string str = sReader.ReadToEnd();
  sReader.Close();
  wResponse.Close();
  return str;
}

public void GetBinaryData()
{
  string imgFile = DateTime.Now.ToString("yyyyMMddhhmmss") + ".jpg";
  string filePath = HttpContext.Current.Server.MapPath(imgFile);
  //方法一
  int lang = HttpContext.Current.Request.TotalBytes;
  byte[] bytes = HttpContext.Current.Request.BinaryRead(lang);
  string content = System.Text.Encoding.UTF8.GetString(bytes);
  FileStream fStream = new FileStream(filePath,FileMode.Create,FileAccess.Write);
  BinaryWriter bw = new BinaryWriter(fStream);
  bw.Write(bytes);
  bw.Close();
  fStream.Close();    
  //方法二
  Bitmap img = new Bitmap(HttpContext.Current.Request.InputStream);
  img.Save(filePath);
  HttpContext.Current.Response.Write("ok");
}