bute[] 转stream

byte[] bPhoto = yourBytes;
if(bPhoto!=null)
{
//Read data
MemoryStream stream=new MemoryStream(bPhoto,true);
stream.Read(bPhoto,0,bPhoto.Length);

// Create a bitmap from the stream
Bitmap bmp = new Bitmap(stream);

// Close the stream
stream.Close();

return bmp;
}
else
return null;