如何使用委托BackgroundWorker

我试着用Kinect写一个WPF应用程序，所以我写了下面的代码:

    static BackgroundWorker _bw = new BackgroundWorker();
    _bw.DoWork += bw_DoWork;
    _bw.RunWorkerAsync();
    dispatcherTimerGame = new System.Windows.Threading.DispatcherTimer();
    dispatcherTimerGame.Tick += new EventHandler(dispatcher_VerificaCarte);
    dispatcherTimerGame.Interval = new TimeSpan(0, 0, 1);
    dispatcherTimerGame.Start();
    void bw_DoWork(object sender, DoWorkEventArgs e)
    {
       try
       {
          this.sensorChooser = new KinectSensorChooser();
          this.sensorChooser.KinectChanged += SensorChooserOnKinectChanged;
          this.sensorChooserUi.KinectSensorChooser = this.sensorChooser;
          this.sensorChooser.Start();
          this.sensor = this.sensorChooser.Kinect;
          if (this.sensor != null)
          {
             DateTime dat1 = DateTime.Now;
             string date = DateTime.Now.ToString("dd-MMM-yy HH-mm");
             acquisizioneVideo = new Acquisizione("Video" + date + ".avi");
             this.sensor.ColorStream.Enable(ColorImageFormat.RgbResolution640x480Fps30);
             acquisizioneAudio = new AcquisizioneWaveAudio(180, this.sensor, "Audio" + date + ".wav");     acquisizioneAudio.recordAudio();
             acquisizioneVideo.recordVideo();
             this.sensor.ColorFrameReady += acquisizioneVideo.ColorImageReady;
          }
       }
    catch (Exception exc)
    {
       log.Error(exc);
    }
}

所以当我尝试执行这段代码时this.sensorChooserUi.KinectSensorChooser = this.sensorChooser;,我有这个错误:

[System.InvalidOperationException] = {"The calling thread cannot access this object because a different thread owns it."}"

我该如何修复它?

this.Dispatcher.Invoke(() =>
      this.sensorChooser = new KinectSensorChooser();
      this.sensorChooser.KinectChanged += SensorChooserOnKinectChanged;
      this.sensorChooserUi.KinectSensorChooser = this.sensorChooser;
      this.sensorChooser.Start();
      this.sensor = this.sensorChooser.Kinect;
});