//byte[] 转图片  public static Bitmap BytesToBitmap(byte[] Bytes)          {              MemoryStream stream = null;              try              {                  stream = new MemoryStream(Bytes);                  return new Bitmap((Image)new Bitmap(stream));              }              catch (ArgumentNullException ex)              {                  throw ex;              }              catch (ArgumentException ex)              {                  throw ex;              }              finally              {                  stream.Close();              }          }     //图片转byte[]           public static byte[] BitmapToBytes(Bitmap Bitmap)          {              MemoryStream ms = null;              try              {                  ms = new MemoryStream();                  Bitmap.Save(ms, Bitmap.RawFormat);                  byte[] byteImage = new Byte[ms.Length];                  byteImage = ms.ToArray();                  return byteImage;              }              catch (ArgumentNullException ex)              {                  throw ex;              }              finally              {                  ms.Close();              }          }      }    =====================    * Stream 和 byte[] 之间的转换   * - - - - - - - - - - - - - - - - - - - - - - - */  /// 
  /// 将 Stream 转成 byte[]  /// 
  public byte[] StreamToBytes(Stream stream)  {      byte[] bytes = new byte[stream.Length];      stream.Read(bytes, 0, bytes.Length);        // 设置当前流的位置为流的开始      stream.Seek(0, SeekOrigin.Begin);      return bytes;  }    /// 
  /// 将 byte[] 转成 Stream  /// 
  public Stream BytesToStream(byte[] bytes)  {      Stream stream = new MemoryStream(bytes);      return stream;  }      /* - - - - - - - - - - - - - - - - - - - - - - - -   * Stream 和 文件之间的转换  * - - - - - - - - - - - - - - - - - - - - - - - */  /// 
  /// 将 Stream 写入文件  /// 
  public void StreamToFile(Stream stream,string fileName)  {      // 把 Stream 转换成 byte[]      byte[] bytes = new byte[stream.Length];      stream.Read(bytes, 0, bytes.Length);      // 设置当前流的位置为流的开始      stream.Seek(0, SeekOrigin.Begin);        // 把 byte[] 写入文件      FileStream fs = new FileStream(fileName, FileMode.Create);      BinaryWriter bw = new BinaryWriter(fs);      bw.Write(bytes);      bw.Close();      fs.Close();  }    /// 
  /// 从文件读取 Stream  /// 
  public Stream FileToStream(string fileName)  {                  // 打开文件      FileStream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read);      // 读取文件的 byte[]      byte[] bytes = new byte[fileStream.Length];      fileStream.Read(bytes, 0, bytes.Length);      fileStream.Close();      // 把 byte[] 转换成 Stream      Stream stream = new MemoryStream(bytes);      return stream;  }