C# Windows 10 Frame.GoBack（）方法中的奇怪问题？

我在Windows 10上工作，我使用硬件按钮导航回所有页面，但在某些情况下，当操作完成时。我正在使用

this.Frame.GoBack（）

导航回上一页。但当我使用这种方法返回时，当我第一次单击硬件返回按钮时，什么也没发生。当我第二次单击它时，它会工作。仅当使用了

This.Frame.GoBack（）

时才会发生这种情况

第1页的示例代码

private void AddNotePage_Loaded(object sender, RoutedEventArgs e)
    {
        if (ApiInformation.IsTypePresent("Windows.Phone.UI.Input.HardwareButtons"))
        {
            Windows.Phone.UI.Input.HardwareButtons.BackPressed += HardwareButtons_BackPressed;
        }
        else
        {
            SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility = AppViewBackButtonVisibility.Visible;
            SystemNavigationManager.GetForCurrentView().BackRequested += (s, e1) =>
            {
                if (this.Frame.CanGoBack)
                    this.Frame.GoBack();
            };
        }
    }

     protected override void OnNavigatingFrom(NavigatingCancelEventArgs e)
    {
        base.OnNavigatingFrom(e);
        Windows.Phone.UI.Input.HardwareButtons.BackPressed -= HardwareButtons_BackPressed;
    }

    private void HardwareButtons_BackPressed(object sender, Windows.Phone.UI.Input.BackPressedEventArgs e)
    {
        Debug.WriteLine("BackPressed");
        if (Frame.CanGoBack)
        {
            Frame.GoBack();
            e.Handled = true;
        }
    }

第2页的示例代码

 private void AddNotePage_Loaded(object sender, RoutedEventArgs e)
    {
        if (ApiInformation.IsTypePresent("Windows.Phone.UI.Input.HardwareButtons"))
        {
            Windows.Phone.UI.Input.HardwareButtons.BackPressed += HardwareButtons_BackPressed;
        }
        else
        {
            SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility = AppViewBackButtonVisibility.Visible;
            SystemNavigationManager.GetForCurrentView().BackRequested += (s, e1) =>
            {
                if (this.Frame.CanGoBack)
                    this.Frame.GoBack();
            };
        }
 }

 protected override void OnNavigatingFrom(NavigatingCancelEventArgs e)
    {
        base.OnNavigatingFrom(e);
        Windows.Phone.UI.Input.HardwareButtons.BackPressed -= HardwareButtons_BackPressed;
    }

    private void HardwareButtons_BackPressed(object sender, Windows.Phone.UI.Input.BackPressedEventArgs e)
    {
        Debug.WriteLine("BackPressed");
        if (Frame.CanGoBack)
        {
            Frame.GoBack();
            e.Handled = true;
        }
    }

     private async void AppBarButton_Click(object sender, RoutedEventArgs e)
    {
         // calling web service and when I get result=1 from it. I navigate  back
         this.Frame.GoBack();
    }

有人能告诉我为什么要面对这个问题吗？

Page1.xaml
Page1.xaml   
 <Page
        x:Class="test1.BlankPage1"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="using:test1"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        mc:Ignorable="d">

        <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
    <SplitView x:Name="testSplitView" PaneBackground="White" PanePlacement="Right" OpenPaneLength="200">
        <SplitView.Pane>
            <Button Content="goto page 2" Click="Button_Click"/>
        </SplitView.Pane>

        <SplitView.Content>
            <Grid>
                <Grid.RowDefinitions>
                    <RowDefinition Height="Auto"/>
                    <RowDefinition Height="*"/>
                </Grid.RowDefinitions>
                <Button x:Name="HamburgerButton"
                            FontFamily="Segoe MDL2 Assets" 
                            Content="&#xE700;"
                            Width="50"
                            Height="50" 
                            Background="Transparent"
                            Grid.Row="0"
                            HorizontalAlignment="Right"
                            VerticalAlignment="Center"
                            Click="HamburgerButton_Click"/>

                <Button Content="Don't click Just added for testing" Click="Button_Click"
                        Grid.Row="1"/>
            </Grid>
        </SplitView.Content>

    </SplitView>

</Grid>
    </Page>

Page1.xaml.cs
public sealed partial class BlankPage1: Page
    {
        public BlankPage1()
        {
            this.InitializeComponent();
            this.Loaded += BlankPage1_Loaded;
        }

        private void BlankPage1_Loaded(object sender, RoutedEventArgs e)
        {
            if (ApiInformation.IsTypePresent("Windows.Phone.UI.Input.HardwareButtons"))
            {
                Windows.Phone.UI.Input.HardwareButtons.BackPressed += HardwareButtons_BackPressed;
            }
            else
            {
                SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility = AppViewBackButtonVisibility.Visible;
                SystemNavigationManager.GetForCurrentView().BackRequested += (s, e1) =>
                {
                    if (this.Frame.CanGoBack)
                        this.Frame.GoBack();
                };
            }

        }
        protected override void OnNavigatedFrom(NavigationEventArgs e)
        {
            base.OnNavigatedFrom(e);
            Windows.Phone.UI.Input.HardwareButtons.BackPressed -= HardwareButtons_BackPressed;
        }
        private void HardwareButtons_BackPressed(object sender, BackPressedEventArgs e)
        {
            if (Frame.CanGoBack)
            {
                Frame.GoBack();
                e.Handled = true;
            }
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            if (this.testSplitView.IsPaneOpen)
                this.testSplitView.IsPaneOpen = false;
            Frame.Navigate(typeof(BlankPage2));
        }

         private void HamburgerButton_Click(object sender, RoutedEventArgs e)
    {
        this.testSplitView.IsPaneOpen = true;
    }
    }
page2.xaml

<Page
    x:Class="test1.BlankPage2"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:test1"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d">

    <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
        <Button Content="goto page3" Click="Button_Click"/>
    </Grid>
</Page>
page2.xaml.cs

  public sealed partial class BlankPage2 : Page
    {
        public BlankPage2()
        {
            this.InitializeComponent();
            this.Loaded += BlankPage2_Loaded;
        }
        private void BlankPage2_Loaded(object sender, RoutedEventArgs e)
        {
            if (ApiInformation.IsTypePresent("Windows.Phone.UI.Input.HardwareButtons"))
            {
                Windows.Phone.UI.Input.HardwareButtons.BackPressed += HardwareButtons_BackPressed;
            }
            else
            {
                SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility = AppViewBackButtonVisibility.Visible;
                SystemNavigationManager.GetForCurrentView().BackRequested += (s, e1) =>
                {
                    if (this.Frame.CanGoBack)
                        this.Frame.GoBack();
                };
            }
        }
        protected override void OnNavigatedFrom(NavigationEventArgs e)
        {
            base.OnNavigatedFrom(e);
            Windows.Phone.UI.Input.HardwareButtons.BackPressed -= HardwareButtons_BackPressed;
        }
        private void HardwareButtons_BackPressed(object sender, Windows.Phone.UI.Input.BackPressedEventArgs e)
        {
            if (Frame.CanGoBack)
            {
                Frame.GoBack();
                e.Handled = true;
            }
        }
        private void Button_Click(object sender, RoutedEventArgs e)
        {
            Frame.Navigate(typeof(BlankPage3));
        }
}
page3.xaml
<Page
    x:Class="test1.BlankPage3"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:test1"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d">

    <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
        <Button Content="goback to page2" Click="Button_Click"/>
    </Grid>
</Page>

page3.xaml.cs
 public sealed partial class BlankPage3 : Page
    {
        public BlankPage3()
        {
            this.InitializeComponent();
            this.Loaded += BlankPage3_Loaded;
        }

        private void BlankPage3_Loaded(object sender, RoutedEventArgs e)
        {
            if (ApiInformation.IsTypePresent("Windows.Phone.UI.Input.HardwareButtons"))
            {
                Windows.Phone.UI.Input.HardwareButtons.BackPressed += HardwareButtons_BackPressed;
            }
            else
            {
                SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility = AppViewBackButtonVisibility.Visible;
                SystemNavigationManager.GetForCurrentView().BackRequested += (s, e1) =>
                {
                    if (this.Frame.CanGoBack)
                        this.Frame.GoBack();
                };
            }

        }
        protected override void OnNavigatedFrom(NavigationEventArgs e)
        {
            base.OnNavigatedFrom(e);
            Windows.Phone.UI.Input.HardwareButtons.BackPressed -= HardwareButtons_BackPressed;
        }
        private void HardwareButtons_BackPressed(object sender, BackPressedEventArgs e)
        {
            if (Frame.CanGoBack)
            {
                Frame.GoBack();
                e.Handled = true;
            }
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            if (Frame.CanGoBack)
            {
               Frame.GoBack();
            }
        }
    }

Page1.xaml.cs
公共密封部分类空白第1页：第
{
公共网页1（）
{
this.InitializeComponent（）；
this.Loaded+=BlankPage1\u Loaded；
}
已加载专用无效空白页1_（对象发送方，路由目标e）
{
if（ApiInformation.IsTypePresent（“Windows.Phone.UI.Input.HardwareButtons”））
{
Windows.Phone.UI.Input.HardwareButtons.BackPressed+=硬件按钮\u BackPressed；
}
其他的
{
SystemNavigationManager.GetForCurrentView（）.AppViewBackButtonVisibility=AppViewBackButtonVisibility.Visible；
SystemNavigationManager.GetForCurrentView（）.BackRequested+=（s，e1）=>
{
if（本帧CanGoBack）
this.Frame.GoBack（）；
};
}
}
受保护的覆盖无效OnNavigatedFrom（NavigationEventArgs e）
{
基于（e）的导航；
Windows.Phone.UI.Input.HardwareButtons.BackPressed-=HardwareButtons\u BackPressed；
}
私有无效硬件按钮\u反压（对象发送器，反压EventArgs e）
{
if（框架CanGoBack）
{
Frame.GoBack（）；
e、 已处理=正确；
}
}
私有无效按钮\u单击（对象发送者，路由目标e）
{
if（this.testSplitView.IsPaneOpen）
this.testSplitView.IsPaneOpen=false；
框架导航（typeof（BlankPage2））；
}
私有无效汉堡按钮点击（对象发送者，路由目标e）
{
this.testSplitView.IsPaneOpen=true；
}
}
第2.xaml页
page2.xaml.cs
公共密封部分类空白第2页：第
{
公共网页2（）
{
this.InitializeComponent（）；
this.Loaded+=BlankPage2_Loaded；
}
已加载专用无效空白页2_（对象发送方，路由目标e）
{
if（ApiInformation.IsTypePresent（“Windows.Phone.UI.Input.HardwareButtons”））
{
Windows.Phone.UI.Input.HardwareButtons.BackPressed+=硬件按钮\u BackPressed；
}
其他的
{
SystemNavigationManager.GetForCurrentView（）.AppViewBackButtonVisibility=AppViewBackButtonVisibility.Visible；
SystemNavigationManager.GetForCurrentView（）.BackRequested+=（s，e1）=>
{
if（本帧CanGoBack）
this.Frame.GoBack（）；
};
}
}
受保护的覆盖无效OnNavigatedFrom（NavigationEventArgs e）
{
基于（e）的导航；
Windows.Phone.UI.Input.HardwareButtons.BackPressed-=HardwareButtons\u BackPressed；
}
私有无效硬件按钮（对象发送器，Windows.Phone.UI.Input.BackPressedEventArgs e）
{
if（框架CanGoBack）
{
Frame.GoBack（）；
e、 已处理=正确；
}
}
私有无效按钮\u单击（对象发送者，路由目标e）
{
框架导航（typeof（BlankPage3））；
}
}
第3.xaml页
page3.xaml.cs
公共密封部分类空白第3页：第
{
公共网页3（）
{
this.InitializeComponent（）；
this.Loaded+=BlankPage3_Loaded；
}
已加载专用无效空白页3_（对象发送方、路由目标）
{
if（ApiInformation.IsTypePresent（“Windows.Phone.UI.Input.HardwareButtons”））
{
Windows.Phone.UI.Input.HardwareButtons.BackPressed+=硬件按钮\u BackPressed；
}
其他的
{
SystemNavigationManager.GetForCurrentView（）.AppViewBackButtonVisibility=AppViewBackButtonVisibility.Visible；
SystemNavigationManager.GetForCurrentView（）.BackRequested+=（s，e1）=>
{
if（本帧CanGoBack）
this.Frame.GoBack（）；
};
}
}
受保护的覆盖无效OnNavigatedFrom（NavigationEventArgs e）
{
基于（e）的导航；
Windows.Phone.UI.Input.HardwareButtons.BackPressed-=HardwareButtons\u BackPressed；
}
私有无效硬件按钮\u反压（对象发送器，反压EventArgs e）
{
if（框架CanGoBack）
{
Frame.GoBack（）；
e、 已处理=正确；
}
}
私有无效按钮\u单击（对象发送者，路由目标e）
{
if（框架CanGoBack）
{
Frame.GoBack（）；
}
}
}

您是否尝试过调试？第一次是

Frame.CanGoBack=true

吗？是的，我尝试过调试，但当我第一次单击后退按钮时，它没有触发

HardwareButtons\u BackPressed

事件。当我第二次点击它时，它会开火。硬件也可能会开火