两个devExpress的chartControl联动

chartControl1.RuntimeSelection = true;
chartControl1.RuntimeSeriesSelectionMode = SeriesSelectionMode.Point；
chartControl1.MouseClick += new MouseEventHandler(Chart_MouseClick);
 
public void Chart_MouseClick(object sender, MouseEventArgs e)
        {
            ChartHitInfo hi = chartControl1.CalcHitInfo(new System.Drawing.Point(e.X, e.Y));
 
            if (hi.Diagram != null)
            {
                int LeftX = -1, RightX = -1;
                //for (int X = chartControl1.Bounds.Left; X < chartControl1.Bounds.Right; X++)
                //{
                //    hi = chartControl1.CalcHitInfo(X, e.Y);
                //    if (hi.InDiagram)
                //    {
                //        if (LeftX == -1)
                //            LeftX = X;
                //        else
                //            RightX = X;
                //    }
                //}
                XYDiagram D = chartControl1.Diagram as XYDiagram;
 
                <b>if (hi.SeriesPoint != null)</b>
                {
 
                    //MessageBox.Show(string.Format("X:{0},Y:{1},{2}", LeftX, RightX,hi.SeriesPoint.Argument
                    //        //((chartControl1.Series.ToArray())[0].Points.ToArray())[0].Argument
                    //    ));
                    this._vNewParam = hi.SeriesPoint.Argument; //((chartControl1.Series.ToArray())[0].Points.ToArray())[0].Argument;
 
                    this.Invoke((MethodInvoker)delegate()
                    {
                        //TODO:string.IsNullOrEmpty
                        if (string.IsNullOrEmpty(_vNewParam)) return;
                        if (_vCurrentPrama == _vNewParam) return;
 
                        _vCurrentPrama = _vNewParam;
                        InitializePVC(_vCurrentPrama);
                    });
                }
            }
        }

ChartHitInfo hi = chartControl1.CalcHitInfo(new System.Drawing.Point(e.X, e.Y));
if (hi.SeriesPoint != null){}
这是关键！