C# AutomationElement - Get All Tray Icons Including Hidden (Windows 10)

Question

I'm using the following code to attempt to get all Tray Icons, including the ones hidden by Windows 10.

    public static List<AutomationElement> EnumNotificationIcons()
    {
        var data = new List<AutomationElement>();

        foreach (var button in AutomationElement.RootElement.Find(
                        "User Promoted Notification Area").EnumChildButtons())
        {
            data.Add(button);
        }

        foreach (var button in AutomationElement.RootElement.Find(
                      "System Promoted Notification Area").EnumChildButtons())
        {
            data.Add(button);
        }

        var chevron = AutomationElement.RootElement.Find("Notification Chevron");
        if (chevron != null && chevron.InvokeButton())
        {
            foreach (var button in AutomationElement.RootElement.Find(
                               "Overflow Notification Area").EnumChildButtons())
            {
                data.Add(button);
            }
        }

        return data;
    }

However the list returned only includes visible icons. Anything hidden is skipped over. The tray icons hidden aren't being returned.

What am I missing here?

EDIT:

I've updated the code to look like this. Still not pulling in hidden icons. https://blogs.msdn.microsoft.com/oldnewthing/20141013-00/?p=43863

    public static IEnumerable<AutomationElement> EnumNotificationIcons()
    {
        var userArea = AutomationElement.RootElement.Find("User Promoted Notification Area");
        if (userArea != null)
        {
            foreach (var button in userArea.EnumChildButtons())
            {
                yield return button;
            }

            foreach (var button in userArea.GetTopLevelElement().Find("System Promoted Notification Area").EnumChildButtons())
            {
                yield return button;
            }
        }

        var chevron = AutomationElement.RootElement.Find("Notification Chevron");
        if (chevron != null && chevron.InvokeButton())
        {
            foreach (var button in AutomationElement.RootElement.Find("Overflow Notification Area").EnumChildButtons())
            {
                yield return button;
            }
        }
    }

Answer 1

I was able to get this working with the following code. I had to force wait it appears.

    /// <summary>
    /// Enums the notification icons in the Tray.
    /// </summary>
    /// <returns>List of Notification Icons from the Tray.</returns>
    public static IEnumerable<AutomationElement> EnumNotificationIcons()
    {
        var userArea = AutomationElement.RootElement.Find(UINotificationAreaConstants.UserPromotedNotificationArea);
        if (userArea != null)
        {
            foreach (var button in userArea.EnumChildButtons())
            {
                yield return button;
            }

            foreach (var button in userArea.GetTopLevelElement().Find(UINotificationAreaConstants.SystemPromotedNotificationArea).EnumChildButtons())
            {
                yield return button;
            }
        }

        var chevron = AutomationElement.RootElement.Find(UINotificationAreaConstants.NotificationChevron);
        if (chevron != null && chevron.InvokeButton())
        {
            var elm = AutomationElement.RootElement.Find(
                                UINotificationAreaConstants.OverflowNotificationArea);

            WaitForElm(elm);

            foreach (var button in elm.EnumChildButtons())
            {
                yield return button;
            }
        }
    }

    /// <summary>
    /// Waits for elm to be ready for processing.
    /// </summary>
    /// <param name="targetControl">The target control.</param>
    /// <returns>The WindowPattern.</returns>
    private static WindowPattern WaitForElm(AutomationElement targetControl)
    {
        WindowPattern windowPattern = null;

        try
        {
            windowPattern =
                targetControl.GetCurrentPattern(WindowPattern.Pattern)
                as WindowPattern;
        }
        catch (InvalidOperationException)
        {
            // object doesn't support the WindowPattern control pattern
            return null;
        }
        // Make sure the element is usable.
        if (!windowPattern.WaitForInputIdle(10000))
        {
            // Object not responding in a timely manner
            return null;
        }
        return windowPattern;
    }