Question

In my application I want to notify the user with the ShellToast.

Just by running…

var toast = new ShellToast
{
    Title = "Nom nom nom!",
    Content = "More! More! Keep feeding me!",
};
toast.Show();

…makes nothing happen, and as I understand it needs to be run from a ScheduledTaskAgent. But how do I run this on command, and make sure it only run once?

Answer 1

You can’t use a ShellToast while the app is the foreground app. It’s meant to be invoked from a background service while the app isn’t the foreground app.

If you want to have a UX similar to that of ShellToast use the Coding4fun toolkit ToastPrompt control. Here’s a code snippet showing how to use it:

    private void ToastWrapWithImgAndTitleClick(object sender, RoutedEventArgs e)
    {
        var toast = GetToastWithImgAndTitle();
        toast.TextWrapping = TextWrapping.Wrap;

        toast.Show();
    }

    private static ToastPrompt GetToastWithImgAndTitle()
    {
        return new ToastPrompt
        {
            Title = "With Image",
            TextOrientation = System.Windows.Controls.Orientation.Vertical,
            Message = LongText,
            ImageSource = new BitmapImage(new Uri("../../ApplicationIcon.png", UriKind.RelativeOrAbsolute))
        };
    }

Running this code snippet shows the following: