using Microsoft.Phone.Tasks;

CameraCaptureTask cameraCaptureTask;

cameraCaptureTask = new CameraCaptureTask();
cameraCaptureTask.Completed += new EventHandler<PhotoResult>(cameraCaptureTask_Completed);

cameraCaptureTask.Show();

void cameraCaptureTask_Completed(object sender, PhotoResult e)
{if (e.TaskResult == TaskResult.OK){MessageBox.Show(e.ChosenPhoto.Length.ToString());//Code to display the photo on the page in an image control named myImage.//System.Windows.Media.Imaging.BitmapImage bmp = new System.Windows.Media.Imaging.BitmapImage();//bmp.SetSource(e.ChosenPhoto);//myImage.Source = bmp;
    }
}

<!-- 相机取景器 --><Canvas x:Name="VideoCanvas"><Canvas.Background><VideoBrush x:Name="BackgroundVideoBrush" ><VideoBrush.RelativeTransform><CompositeTransform x:Name="VideoBrushTransform" CenterY="0.5" CenterX="0.5"/></VideoBrush.RelativeTransform></VideoBrush></Canvas.Background></Canvas>

if ((PhotoCamera.IsCameraTypeSupported(CameraType.Primary) == true) ||(PhotoCamera.IsCameraTypeSupported(CameraType.FrontFacing) == true)){// Initialize the camera, when available.if (PhotoCamera.IsCameraTypeSupported(CameraType.FrontFacing)){// Use front-facing camera if available.
cam = new Microsoft.Devices.PhotoCamera(CameraType.FrontFacing);}else{// Otherwise, use standard camera on back of device.
cam = new Microsoft.Devices.PhotoCamera(CameraType.Primary);}//Set the VideoBrush source to the camera.
viewfinderBrush.SetSource(cam);}else{// The camera is not supported on the device.this.Dispatcher.BeginInvoke(delegate(){// Write message.
txtDebug.Text = "A Camera is not available on this device.";});// Disable UI.
ShutterButton.IsEnabled = false;FlashButton.IsEnabled = false;AFButton.IsEnabled = false;ResButton.IsEnabled = false;}

// Event is fired when the PhotoCamera object has been initialized.
cam.Initialized += new EventHandler<Microsoft.Devices.CameraOperationCompletedEventArgs>(cam_Initialized);// Event is fired when the capture sequence is complete.
cam.CaptureCompleted += new EventHandler<CameraOperationCompletedEventArgs>(cam_CaptureCompleted);// Event is fired when the capture sequence is complete and an image is available.
cam.CaptureImageAvailable += new EventHandler<Microsoft.Devices.ContentReadyEventArgs>(cam_CaptureImageAvailable);// Event is fired when the capture sequence is complete and a thumbnail image is available.
cam.CaptureThumbnailAvailable += new EventHandler<ContentReadyEventArgs>(cam_CaptureThumbnailAvailable);// The event is fired when auto-focus is complete.
cam.AutoFocusCompleted += new EventHandler<CameraOperationCompletedEventArgs>(cam_AutoFocusCompleted);// The event is fired when the viewfinder is tapped (for focus).
viewfinderCanvas.Tap += new EventHandler<GestureEventArgs>(focus_Tapped);// The event is fired when the shutter button receives a half press.
CameraButtons.ShutterKeyHalfPressed += OnButtonHalfPress;// The event is fired when the shutter button receives a full press.
CameraButtons.ShutterKeyPressed += OnButtonFullPress;// The event is fired when the shutter button is released.
CameraButtons.ShutterKeyReleased += OnButtonRelease;

protected override void OnNavigatingFrom(System.Windows.Navigation.NavigatingCancelEventArgs e){if (cam != null){// Dispose camera to minimize power consumption and to expedite shutdown.
cam.Dispose();// Release memory, ensure garbage collection.
cam.Initialized -= cam_Initialized;cam.CaptureCompleted -= cam_CaptureCompleted;cam.CaptureImageAvailable -= cam_CaptureImageAvailable;cam.CaptureThumbnailAvailable -= cam_CaptureThumbnailAvailable;cam.AutoFocusCompleted -= cam_AutoFocusCompleted;CameraButtons.ShutterKeyHalfPressed -= OnButtonHalfPress;CameraButtons.ShutterKeyPressed -= OnButtonFullPress;CameraButtons.ShutterKeyReleased -= OnButtonRelease;}}

public void cam_CaptureThumbnailAvailable(object sender, ContentReadyEventArgs e){string fileName = savedCounter + "_th.jpg";try{// Write message to UI thread.
Deployment.Current.Dispatcher.BeginInvoke(delegate(){txtDebug.Text = "Captured image available, saving thumbnail.";});// Save thumbnail as JPEG to isolated storage.using (IsolatedStorageFile isStore = IsolatedStorageFile.GetUserStoreForApplication()){using (IsolatedStorageFileStream targetStream = isStore.OpenFile(fileName, FileMode.Create, FileAccess.Write)){// Initialize the buffer for 4KB disk pages.byte[] readBuffer = new byte[4096];int bytesRead = -1;// Copy the thumbnail to isolated storage.while ((bytesRead = e.ImageStream.Read(readBuffer, 0, readBuffer.Length)) > 0){targetStream.Write(readBuffer, 0, bytesRead);}}}// Write message to UI thread.
Deployment.Current.Dispatcher.BeginInvoke(delegate(){txtDebug.Text = "Thumbnail has been saved to isolated storage.";});}finally{// Close image stream
e.ImageStream.Close();}}