winform 判断鼠标是否在按钮控件范围内

        public void MourseLeave()
        {
            bool b = this.RectangleToScreen(this.ClientRectangle).Contains(MousePosition);

            //Point SQButtonPoint = this.PointToScreen(this.ClientRectangle.Location);
            //Point MoursePoint = Control.MousePosition;
            //bool MourseSQButton = SQButtonPoint.X + this.Width >= MoursePoint.X && MoursePoint.X >= SQButtonPoint.X && MoursePoint.Y >= SQButtonPoint.Y && SQButtonPoint.Y + this.Height >= MoursePoint.Y;
            if (!b)
            {
                this.BackColor = _NormalColor;
            }
        }