如果你的图像是Bitmap，你可以使用

If your image is Bitmap you can use

LockBits 然后 Scan0 方法：

http://msdn.microsoft.com /query/dev11.query?appId=Dev11IDEF1&l=EN-US&k=k(System.Drawing.Imaging.BitmapData);k(TargetFrameworkMoniker-.NETFramework,Version%3Dv4.5);k(DevLang-csharp） & rd = true

  public static Byte[] BmpToArray(Bitmap value) {
      BitmapData data = value.LockBits(new Rectangle(0, 0, value.Width, value.Height),   ImageLockMode.ReadOnly, value.PixelFormat);

      try {
        IntPtr ptr = data.Scan0;
        int bytes = Math.Abs(data.Stride) * value.Height;
        byte[] rgbValues = new byte[bytes];
        Marshal.Copy(ptr, rgbValues, 0, bytes);

        return rgbValues;
      }
      finally {
        value.UnlockBits(data);
      }
    }