Winfrom 控件移位绘制垂直、水平线

       public delegate void XMatchEventHandler(int x,bool flags);//定义委托
       private int x;

       ///窗体加载

        private void Form1_Load(object sender, EventArgs e)
        {
            XObject.p = this.panel1;
            MatchListener ml = new MatchListener();
            ml.XMatch += new MatchListener.XMatchEventHandler(ml_XMatch);
            ThreadStart ts = new ThreadStart(ml.StratListen);
            Thread t = new Thread(ts);
            t.IsBackground = true;
            t.Start();
        }

        void ml_XMatch(int x,bool flags)
        {           
            this.Invoke(new XMatchEventHandler(myMathch), new object[] { x,flags });
        }

        void myMathch(int x,bool flags)
        {
            //Redr = flags;
            XObject.Redr = false;
        }

       

        private int tempx;
        private int tempy;
        private bool flag = false;

        private void panel1_MouseDown(object sender, MouseEventArgs e)
        {
            tempx = e.X;
            tempy = e.Y;
            flag = true;
            XObject.Redr = true;
            this.panel2.Paint += new PaintEventHandler(Form1_Paint);
        }

        private void panel1_MouseMove(object sender, MouseEventArgs e)
        {
            if (flag == true)
            {
                panel1.Location=(new Point(panel1.Location.X + e.X - tempx, panel1.Location.Y + e.Y - tempy));
            }
        }

        private void panel1_MouseUp(object sender, MouseEventArgs e)
        {
            flag = false;
            XObject.Redr = false;
            panel2.Refresh();
        }

         /// <summary>
        /// 重绘控件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void Form1_Paint(object sender, PaintEventArgs e)
        {
            if (XObject.Redr)
            {
                //BurlyWood CadetBlue Coral CornflowerBlue Cornsilk Crimson DarkBlue DarkCyan DarkGray
                panel2.Refresh();
                panel2.Update();
                if (panel1.Location.X >= 3 || panel1.Location.X <= 3)
                {
                    e.Graphics.DrawLine(new Pen(Color.DarkOrange, 2), new Point(panel1.Location.X, panel1.Parent.Location.Y), new Point(panel1.Location.X, panel1.Location.Y + Height));
                }
                if (panel1.Location.Y >= 3 || panel1.Location.Y <= 3)
                {
                    e.Graphics.DrawLine(new Pen(Color.Orange, 2), new Point(0, panel1.Location.Y), new Point(panel1.Parent.Width, panel1.Location.Y));
                }
                XObject.Redr = false;
            }
        }

    ///静态类

    public class XObject
    {
        public static System.Windows.Forms.Panel p;

        public static bool Redr = false;
    }

   ///侦听

    public class MatchListener
    {
        public delegate void XMatchEventHandler(int x,bool flag);
        public event XMatchEventHandler XMatch;

        public void OnXMatch(int x,bool flag)
        {
            if (XMatch != null)
            {
                XMatch(x,flag);
            }
        }

        public MatchListener() { }

        public int X = 100;
        public int Y = 100;

        public void StratListen()
        {
            while (true)
            {
                if (Math.Abs(XObject.p.Left - X) < (XObject.p.Parent == null ? 200 : XObject.p.Parent.Width))
                {
                    //OnXMatch(X,true);
                    XObject.Redr = true;
                }
                else
                {
                    XObject.Redr = false;
                }

                System.Threading.Thread.Sleep(100);
            }
        }
    }

     注意：重绘时重要的方法Invalidate()  Refresh()  Update()