Toast 在单击时不向页面发送参数并且应用程序已经打开 C#

Question

我有一个 Windows Phone 8.1 通用应用程序可以接收推送通知。单击 toast 时，它会打开应用程序并将参数发送到特定页面。我的问题是，只有当我点击吐司时应用程序关闭时它才有效。如果在我收到通知时该应用程序处于打开状态并单击它，它会将我定向到该应用程序，但不会将参数发送到特定页面 (ImageFullScreen)。你知道需要做什么才能做到这一点吗？

App.Xaml.Cs:

sealed partial class App : Application
{
    public string NavigateText { get; set; }

    public App()
    {
        this.InitializeComponent();
        this.Suspending += OnSuspending;

    }

    protected override void OnLaunched(LaunchActivatedEventArgs e)
    {
        var launchString = e.Arguments;
        (App.Current as App).NavigateText = launchString.ToString();

        if (System.Diagnostics.Debugger.IsAttached)
        {
            this.DebugSettings.EnableFrameRateCounter = true;
        }


        Frame rootFrame = Window.Current.Content as Frame;

        if (rootFrame == null)
        {
            // Create a Frame to act as the navigation context and navigate to the first page
            rootFrame = new Frame();
            // Set the default language
            rootFrame.Language = Windows.Globalization.ApplicationLanguages.Languages[0];

            rootFrame.NavigationFailed += OnNavigationFailed;

            if (e.PreviousExecutionState == ApplicationExecutionState.Terminated)
            {
                //TODO: Load state from previously suspended application
            }

            // Place the frame in the current Window
            Window.Current.Content = rootFrame;
        }

        if (rootFrame.Content == null)
        {
            // When the navigation stack isn't restored navigate to the first page,
            // configuring the new page by passing required information as a navigation
            // parameter
            rootFrame.Navigate(typeof(MainPage), e.Arguments);
        }
        // Ensure the current window is active
        Window.Current.Activate();

    }

MainPage.Xaml.Cs:

    protected override async void OnNavigatedTo(NavigationEventArgs e)
    {
        if ((App.Current as App).NavigateText == "")
        {
            await RefreshTodoItems();
        }
        else
        {
            items2 = await todoTable
                .Where(todoItem => todoItem.Text == (App.Current as App).NavigateText)
                .ToCollectionAsync();
            TodoItem myItem = items2[0] as TodoItem;
            Frame.Navigate(typeof(ImageFullScreen), myItem);
        }           
    }

ImageFullScreen.Xaml.Cs:

    protected override void OnNavigatedTo(NavigationEventArgs e)
    {
        var myObject = (TodoItem)e.Parameter;
        img.Source = new BitmapImage(new Uri(myObject.ImageUri));

        (App.Current as App).NavigateText = "";
    }

Answer 1

问题是OnLaunched方法中的if (rootFrame.Content == null)没有执行，因为app已经打开了（frame的内容是页面）。只激活了window，没有调用MainPage中的OnNavigatedTo方法。

您可以尝试在 OnLaunched 方法中始终像这样启动导航（没有 if 语句）：

rootFrame.Navigate(typeof(MainPage), e.Arguments);
// Ensure the current window is active
Window.Current.Activate();

Toast 在单击时不向页面发送参数并且应用程序已经打开 C#

Toast Not sending parameter to page when clicked and app is already open C#

c#

toast

windows-phone-8.1