Cursor movement event outside of wpf window boundaries

Question

Is there a way to detect an event of cursor movement outside of WPF window? I'm not trying to find out if the cursor moved outside of the window, I'm simply trying to continue being subscribed to the movement event even if the mouse moves outside of wpf window boundary. I've been able to find a lot of stuff that deals with movement within the window, but nothing outside of it (at least nothing that actually works). They were all essentially working only within the window even if the question was asking about the external movement.

Since I haven't been able to find a solution thus far, I've been using the following code I've conjured up. I'm not sure how efficient this code is. I figure, if the system is checking for mouse movement already, it would be inefficient to add a separate check. However, I've been unable to tap into the system portion, since I can't find any good reference on it.

NOTE: I am trying to figure out an existing way of doing this. My code works fine, but it's probably inefficient, because if there's already an event producing code within the system that I can subscribe to, this extra timer loop is additional resource being wasted. I'm not trying to detect if the mouse moved outside of boundaries, I'm simply trying to record coordinates no matter where the mouse moved on screen. So, if the mouse moved on the second monitor, far away from my app window, I would still want an event to fire off and notification to occur. My timer implementation reports coordinates all the time, but I want to make sure I'm not adding an extra layer on top of something that already does the job. This seems to be a major confusion based on those who commented and the answer I received.

public MainWindow()
{
    InitializeComponent();
    InitializeCursorMonitoring();
}

private void InitializeCursorMonitoring()
{
    var point = System.Windows.Forms.Cursor.Position;
    var timer = new System.Windows.Threading.DispatcherTimer();

    timer.Tick += delegate
    {
        if (point != System.Windows.Forms.Cursor.Position)
        {
            point = System.Windows.Forms.Cursor.Position;

            System.Diagnostics.Debug.WriteLine(String.Format("X:{0}  Y:{1}",
                                               System.Windows.Forms.Cursor.Position.X, 
                                               System.Windows.Forms.Cursor.Position.Y));
        }
    };

    timer.Interval = new TimeSpan(0, 0, 0, 0, 100);
    timer.Start();
}

Answer 1

As mentioned by others you need to capture the mouse. Here's a sample based on your code illustrating it:

private void InitializeCursorMonitoring()
{
    var point = Mouse.GetPosition(Application.Current.MainWindow);
    var timer = new System.Windows.Threading.DispatcherTimer();

    timer.Tick += delegate
    {
        Application.Current.MainWindow.CaptureMouse();
        if (point != Mouse.GetPosition(Application.Current.MainWindow))
        {
            point = Mouse.GetPosition(Application.Current.MainWindow);
            Console.WriteLine(String.Format("X:{0}  Y:{1}", point.X, point.Y));
        }
        Application.Current.MainWindow.ReleaseMouseCapture();
    };

    timer.Interval = new TimeSpan(0, 0, 0, 0, 100);
    timer.Start();
}

Capturing the mouse before getting the position to get the position anywhere on the screen and releasing it after to resume normal mouse functionality.