Cannot get Keyboard Accelerators to work…AT ALL

问题

I've also posted this question to Microsoft's Documentation here.

I am trying to implement both Access Keys and Keyboard Accelerators in a UWP app, which, as I understand it, is "good coding practice". Here is a snippet from MainPage.xaml where I try to implement the "open" shortcut key of "Ctrl+O"

<MenuFlyoutItem Text="Open" AccessKey="O" Click="menuFileOpen">
   <MenuFlyoutItem.KeyboardAccelerators>
        <KeyboardAccelerator Modifiers="Control" Key="O" Invoked="menuFileOpen"/>
   </MenuFlyoutItem.KeyboardAccelerators> 
</MenuFlyoutItem>

Inside MainPage.xaml.cs is the following snippet of code:

    /// <summary>
    /// Menu option to select a file
    /// </summary>
    private void menuFileOpen(object sender, RoutedEventArgs e)
    {
        this.OpenFile();
    }

    /// <summary>
    /// Keyboard Accelerator to select a file
    /// </summary>
    private void menuFileOpen(KeyboardAccelerator sender, KeyboardAcceleratorInvokedEventArgs args)
    {
        this.OpenFile();
        args.Handled = true; // because the docs say to do this
    }

    /// <summary>
    /// Opens the dialog box to select a file.
    /// </summary>
    private void OpenFile()
    {
        // TODO: write the code to open the file
        throw new NotImplementedException();
    }

For debugging purposes, I haven't actually implemented the code to open the file, because of the issue I'm having. All that should happen is, when I select Open from the menu, I should get "NotImplementedException" in the debugger, and the program should stop.

In short, selecting the flyout menu item with a mouse throws the exception. Using access keys also throws the exception. Pressing the Keyboard Accelerator, however, does NOTHING! It doesn't enter the "Invoked" method (the second method signature above), so I can't even place a break point to see if the method gets a hit at all...which I'm pretty certain it doesn't!

What I've tried:

Renaming the methods to give them unique names
Adding the "IsEnabled" property, setting it to true, on the KeyboardAccelerator tag in the XAML file.

Any assistance is very much appreciated.

来源：https://stackoverflow.com/questions/51456230/cannot-get-keyboard-accelerators-to-work-at-all

标签

visual-studio

uwp

uwp-xaml