问如何获取活动屏幕尺寸？

EN

/// <summary>
/// Set the max size of the application window taking into account the current monitor
/// </summary>
public static void SetMaxSizeWindow(ioConnect _receiver)
{
    Point absoluteScreenPos = _receiver.PointToScreen(Mouse.GetPosition(_receiver));

    if (System.Windows.SystemParameters.VirtualScreenLeft == System.Windows.SystemParameters.WorkArea.Left)
    {
        //Primary Monitor is on the Left
        if (absoluteScreenPos.X <= System.Windows.SystemParameters.PrimaryScreenWidth)
        {
            //Primary monitor
            _receiver.WindowApplication.MaxWidth = System.Windows.SystemParameters.WorkArea.Width;
            _receiver.WindowApplication.MaxHeight = System.Windows.SystemParameters.WorkArea.Height;
        }
        else
        {
            //Secondary monitor
            _receiver.WindowApplication.MaxWidth = System.Windows.SystemParameters.VirtualScreenWidth - System.Windows.SystemParameters.WorkArea.Width;
            _receiver.WindowApplication.MaxHeight = System.Windows.SystemParameters.VirtualScreenHeight;
        }
    }

    if (System.Windows.SystemParameters.VirtualScreenLeft < 0)
    {
        //Primary Monitor is on the Right
        if (absoluteScreenPos.X > 0)
        {
            //Primary monitor
            _receiver.WindowApplication.MaxWidth = System.Windows.SystemParameters.WorkArea.Width;
            _receiver.WindowApplication.MaxHeight = System.Windows.SystemParameters.WorkArea.Height;
        }
        else
        {
            //Secondary monitor
            _receiver.WindowApplication.MaxWidth = System.Windows.SystemParameters.VirtualScreenWidth - System.Windows.SystemParameters.WorkArea.Width;
            _receiver.WindowApplication.MaxHeight = System.Windows.SystemParameters.VirtualScreenHeight;
        }
    }
}