Question

最近我遇到了另一个难以理解的问题。在msdn（http://msdn.microsoft.com/library/windows/apps/hh202868%28v=vs.105%29.aspx）上我们读到：

Also, the BackKeyPress event is available in the PhoneApplicationFrame class. The frame can handle the event directly before the active page receives it and the key press can be canceled

根据这个，我写了一个简单的例子：

private void InitializePhoneApplication()
    {
        if (phoneApplicationInitialized)
            return;

        // Create the frame but don't set it as RootVisual yet; this allows the splash
        // screen to remain active until the application is ready to render.
        RootFrame = new PhoneApplicationFrame();
        RootFrame.Navigated += CompleteInitializePhoneApplication;
        RootFrame.BackKeyPress += App_BackKeyPress;
        // Handle navigation failures
        RootFrame.NavigationFailed += RootFrame_NavigationFailed;

        // Ensure we don't initialize again
        phoneApplicationInitialized = true;

    }

    void App_BackKeyPress(object sender, System.ComponentModel.CancelEventArgs e)
    {
        Debug.WriteLine("1");
        e.Cancel = true;
    }

在MainClass中，我在下面添加了代码，以确定它是否真的停止了

        public MainPage()
    {
        InitializeComponent();
        this.BackKeyPress += MainPage_BackKeyPress;
    }

    void MainPage_BackKeyPress(object sender, CancelEventArgs e)
    {
        Debug.WriteLine("2");
    }

令我失望的是，输出显示＆＃34; 1 2＆＃34;那么它有什么不可以抑制密钥执行呢？

Answer 1

我遇到了类似的问题，Windows Phone只能取消返回执行时有什么要回去，我的意思是任何PhoneApplicationPage。我想你按下第一页上的Go Back按钮，因此WP无需备份。在您的页面上添加按钮指向另一个页面，在此页面上按“返回”以查看是否禁止执行。

在RootFrame上阻止BackKeyPress无法正常运行Windows Phone

1 个答案: