public MainPage(){
    this.InitializeComponent();
    if(Windows.Foundation.Metadata.ApiInformation.IsTypePresent("Windows.Phone.UI.Input.HardwareButtons")) {
        Windows.Phone.UI.Input.HardwareButtons.BackPressed += HardwareButtons_BackPressed;
    }
}
private void HardwareButtons_BackPressed(object sender,BackPressedEventArgs e) {
    if(insideFrame.CanGoBack())insideFrame.GoBack();
    else  Application.Current.Exit();
}

SystemNavigationManager currentView = SystemNavigationManager.GetForCurrentView();

Windows 10 (UWP)在Windows.UI.Core命名空间中包含SystemNavigationManager，仅用于导航。

因为SystemNavigationManager是Windows Universal Platform的一部分，所以，它支持在Windows 10上运行的所有设备系列，包括移动和PC。

单页

---

如果你只想处理单个页面的导航。执行以下步骤

步骤1

。使用名称空间Windows.UI.Core

using Windows.UI.Core;

步骤2。为当前视图注册回请求事件。最好的地方是InitializeComponent()之后的类的主构造函数。

public MainPage()
{
    this.InitializeComponent();
    //register back request event for current view
    SystemNavigationManager.GetForCurrentView().BackRequested += MainPage_BackRequested;
}

步骤3。处理BackRequested事件

private void Food_BackRequested(object sender, BackRequestedEventArgs e)
{
    if (Frame.CanGoBack)
    {
        Frame.GoBack();
        e.Handled = true;
    }
}

单个rootFrame在一个地方完成申请

---

处理所有视图的所有后退按钮的最佳位置是App.xaml.cs

步骤1

。使用名称空间Windows.UI.Core

using Windows.UI.Core;

步骤2。为当前视图注册回请求事件。最好的位置是OnLaunched在Window.Current.Activate之前

protected override void OnLaunched(LaunchActivatedEventArgs e)
{
    ...
    SystemNavigationManager.GetForCurrentView().BackRequested += OnBackRequested;
    Window.Current.Activate();
}
    

步骤3。处理BackRequested事件

private void OnBackRequested(object sender, BackRequestedEventArgs e)
{
    Frame rootFrame = Window.Current.Content as Frame;
    if (rootFrame.CanGoBack)
    {
        rootFrame.GoBack();
        e.Handled = true;
    }
}

---

参考资料-手柄后退按钮按在UWP

希望这对某人有帮助!

你需要通过设置BackPressedEventArgs的handled属性为true来告诉系统你处理了backbutton按下。

  private void OnHardwareButtonsBackPressed(object sender, BackPressedEventArgs e)
  {
        // This is the missing line!
        e.Handled = true;
        // Close the App if you are on the startpage
        if (mMainFrame.CurrentSourcePageType == typeof(Startpage))
            App.Current.Exit();
        // Navigate back
        if (mMainFrame.CanGoBack)
        {
            mMainFrame.GoBack();
        }
  }

遵循这些步骤:

• 在你的页面中添加两个全局变量，如下所示

  private NavigationHelper navigationHelper;
  private RelayCommand _GoBackCommand;
  

• 然后在特定页面的构造函数中添加以下代码:

      // below code is to override the back navigation
      // hardware back button press event from navigationHelper
      _GoBackCommand = new RelayCommand
          (
              () => this.CheckGoBack(),
              () => this.CanCheckGoBack()
          );
      navigationHelper.GoBackCommand = _GoBackCommand;
      // ---------
  

• 然后添加刚才在构造函数中声明的两个方法。

  private bool CanCheckGoBack()
  {
      // this should be always true to make sure the app handles back buton manually.
      return true;
  }
  private void CheckGoBack()
  {
      // this will be execute when back button will be pressed
  }
  

p。-在添加新页面时，您可能需要使用BasicPage而不是BlankPage。

希望这将帮助…

试试这个。它将适用于框架返回导航。

  protected override void OnNavigatedTo(NavigationEventArgs e)
    {
      HardwareButtons.BackPressed += HardwareButtons_BackPressed;
    }

    void HardwareButtons_BackPressed(object sender, BackPressedEventArgs e)
    {
    Frame rootFrame = Window.Current.Content as Frame;
        if (Frame.CanGoBack)
        {
            e.Handled = true;
            Frame.GoBack();
        }
    }
}

我认为这是因为你在你的页面上添加了HardwareButtons_BackPressed，而不是在app.xaml.cs.

在app. example .cs:

public App()
{
    this.InitializeComponent();
    this.Suspending += this.OnSuspending;
    HardwareButtons.BackPressed += HardwareButtons_BackPressed;
}
void HardwareButtons_BackPressed(object sender, BackPressedEventArgs e)
{
    Frame rootFrame = Window.Current.Content as Frame;
    if (rootFrame != null && rootFrame.CanGoBack)
    {
        e.Handled = true;
        rootFrame.GoBack();
    }
}

现在，手机的后退键可以在任何页面上工作。

然后，如果你想在任何页面添加一个特定的按钮:

在特定的一页(或每一页，如果你想):

public void btn_return_Tapped(object sender, TappedRoutedEventArgs e)
        {
            Frame rootFrame = Window.Current.Content as Frame;
            if (rootFrame != null && rootFrame.CanGoBack)
            {
                e.Handled = true;
                rootFrame.GoBack();
            }
        }

来源:http://windowsapptutorials.com/tips/general-tips/handling-the-back-button-in-a-windows-phone-8-1-app/