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;
             }
         }