//文件绝对路径 File
    private byte[] FileToSteam(string File)
    {

        FileStream fs = new FileStream(File, FileMode.Open);
        int streamLength = (int)fs.Length;
        byte[] BTFile = new byte[streamLength];
        fs.Read(BTFile, 0, streamLength);
        fs.Close();
        return BTFile;
    }