SuperMap.WindowsPhone.Core.Rectangle2D.IsNullOrEmpty C# (CSharp) Method

        public static bool IsNullOrEmpty(Rectangle2D rect)
        {
            if (rect == null)
            {
                return true;
            }
            if (rect._x.ValueCheck() && rect._y.ValueCheck() && rect._width.ValueCheck() && rect._height.ValueCheck())
            {
                return false;
            }
            if (rect._width < 0.0 || rect._height < 0.0)
            {
                return true;
            }
            return true;
        }