How to open a PDF file in its associated application in a UWP application?-CodePudding

I have a UWP application that contains a PDF file in a folder called Images and I need to open the file in its associated application on Windows (a browser or a PDF reader). I've seen all the similar questions posted here and came to the code below but it didn't work. Any suggestion?

    private async void nviHelp_Tapped(object sender, TappedRoutedEventArgs e)
    {
        string pdfFile = @"Images\witmnlptbr.pdf";

        var file = await Windows.ApplicationModel.Package.Current.InstalledLocation.GetFileAsync(pdfFile);

        if (file != null)
        {
            var success = await Windows.System.Launcher.LaunchFileAsync(file);
        }

    }

CodePudding user response：

The

Make sure that the default app for the PDF file is set to the browser or the PDF reader in the Settings system.