Question

I am using the following code to change the size of the screen:

    private void MouseDoubleClick(object sender, MouseButtonEventArgs e)
    {
        if (e.ChangedButton == MouseButton.Left)
        {
            switch (WindowState)
            {
                case (WindowState.Maximized):
                    {
                        WindowState = WindowState.Normal;
                        break;
                    }
                case (WindowState.Normal):
                    {
                        WindowState = WindowState.Maximized;
                        break;
                    }
            }
        }
    }

However, when i double click as soon as the program starts, i get a small gap along the bottom of the form. To add to the confusion, when i re-size the form to any size (using drag-move), the problem is fixed. Could someone explain why this is occurring, and a possible fix to the problem?

Answer 1

To fully maximize your window, set WindowStyle to None, ResizeMode to NoResize and WindowState to Maximized.

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[Update] The following code works fine for me (note that I have renamed your event handler since yours hides the event System.Windows.Controls.Control.MouseDoubleClick). It resizes from Kiosk mode (fullscreen without window chrome) to regular mode without problems:

private void Window_MouseDoubleClick(object sender, MouseButtonEventArgs e)
{
    if (e.ChangedButton == MouseButton.Left)
    {
        switch (WindowState)
        {
            case (WindowState.Maximized):
                ResizeMode = ResizeMode.CanResize; 
                WindowStyle = WindowStyle.SingleBorderWindow;
                WindowState = WindowState.Normal;
                break;

            case (WindowState.Normal):
                ResizeMode = ResizeMode.NoResize;
                WindowStyle = WindowStyle.None;
                WindowState = WindowState.Maximized;
                break;
        }
    }
}