Silverlight调用摄像头

 CaptureSource source = new CaptureSource();
        private void UserControl_Loaded_1(object sender,RoutedEventArgs e)
        {
            VideoCaptureDevice vcd;
            //话筒就换成这个类 AudioCaptureDevice 
            vcd = CaptureDeviceConfiguration.GetDefaultVideoCaptureDevice();

            source.VideoCaptureDevice = vcd;

            VideoBrush video = new VideoBrush();
            video.SetSource(source);
            rectangle1.Fill = video;

            //截图的回调              source.CaptureImageCompleted += new EventHandler<CaptureImageCompletedEventArgs>(source_CaptureImageCompleted);         }                //截图调用 source.CaptureImageAsync();          void source_CaptureImageCompleted(object sender,CaptureImageCompletedEventArgs e)         {             WriteableBitmap img = e.Result;         }                 //此处开始启动         private void Button_Click_1(object sender,RoutedEventArgs e)         {             if (CaptureDeviceConfiguration.AllowedDeviceAccess || CaptureDeviceConfiguration.RequestDeviceAccess())             {                 //启动摄像头 /麦克风以及其他操作                  source.Start();             }         }