How to determine orientation of Windows Phone 7?

How can you tell whether the device is oriented vertically (portrait) or horizontally (landscape)?

Is there an 开发者_开发百科API that simplifies this or do you have to make the determination "by hand" using the accelerometer?

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I myself just have looked at windows 7 phones(through vs2010 express phone edition).

It seems to have in the code behind this

 public MainPage()
        {
            InitializeComponent();
            // seems to set the supported orientations that your program will support.
            SupportedOrientations = SupportedPageOrientation.Portrait | SupportedPageOrientation.Landscape;
        }

Then the actual form has

  private void PhoneApplicationPage_OrientationChanging(object sender, OrientationChangedEventArgs e)
        {
            var test = e.Orientation;

        }

So when the orientation changes it e.Orientation will tell you what orientation it is. Like for instance LandscapeRight.

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Also you don't have to track this only via the event, you can ask for it directly from the PhoneApplicationPage instance:

private void Button_Click(object sender, RoutedEventArgs e)
{
    MyCurrentOrientation.Text = this.Orientation.ToString();
}

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You can also ask it through this.Orientation when your application starts so you know what the orientation is. Afther the start you can use the OrientationChanged event.

In your main:

OrientationChanged += new EventHandler<OrientationChangedEventArgs>(MainPage_OrientationChanged);

void MainPage_OrientationChanged(object sender, OrientationChangedEventArgs e)

{

   Console.WriteLine(e.Orientation.ToString());

}