[C#] Detect and close a specific popup window.

When you need to detect and close a specific window, you can do using AddAutomationEventHandler method in the namespace System.Windows.Automation. 

• Set Hook

	public static void SetHook()
	{
	System.Windows.Automation.Automation.AddAutomationEventHandler(
	WindowPattern.WindowOpenedEvent,
	AutomationElement.RootElement,
	TreeScope.Children,
	OnWindowOpened);
	}

view raw windows_hook.cs hosted with ❤ by GitHub

line 4, set identifier for window open event which want to detect.
line 7, set event handler  

• Set Event Handler

	private static void OnWindowOpened(object sender, AutomationEventArgs e)
	{
	try
	{
	var element = sender as AutomationElement;
	if (element != null)
	{
	if (element.Current.Name.Equals("WINDOW_TITLE_I_WANT"))
	{
	Console.WriteLine("The winodw is opened.");
	var Elements_ = element.FindAll(TreeScope.Children, new PropertyCondition(AutomationElement.ControlTypeProperty, ControlType.Text));
	foreach (AutomationElement Element in Elements_)
	{
	Console.WriteLine(Element.Current.Name);
	}
	var Elements = element.FindAll(TreeScope.Children, new PropertyCondition(AutomationElement.ControlTypeProperty, ControlType.Button));
	foreach(AutomationElement Element in Elements)
	{
	if (Element.Current.Name.Contains("N"))
	{
	var invokePattern = Element.GetCurrentPattern(InvokePattern.Pattern) as InvokePattern;
	invokePattern?.Invoke();
	}
	}
	}
	}
	}
	catch(ElementNotAvailableException)
	{
	}
	}

view raw event_handler.cs hosted with ❤ by GitHub

line 8, compare name of element with the name to find.

line 15, print the contents of the window

line 22, find the "No" button, it's name has a character "N".

line 24~25, push the button.