关于invoke（）索引超出范围。必须为非负值并小于集合大小。

我在用chart做一个实时温度曲线的时候总是弹出：索引超出范围。必须为非负值并小于集合大小。
参数名: index，请大神看看有什么解决办法
代码如下
 RefreshChart deleRefresh = delegate
                            {
                                chart1.Series[0].Points.AddXY(time.ToOADate(), humi1);
                                chart1.Series[1].Points.AddXY(time.ToOADate(), humi2);
                                chart1.Series[2].Points.AddXY(time.ToOADate(), humi3);
                                chart1.Series[3].Points.AddXY(time.ToOADate(), humi4);
                                chart1.Series[4].Points.AddXY(time.ToOADate(), humi5);
                                chart1.Series[5].Points.AddXY(time.ToOADate(), humi6);
                                chart1.Series[6].Points.AddXY(time.ToOADate(), humi7);
                                chart1.Series[7].Points.AddXY(time.ToOADate(), humi8);
                                chart1.Series[8].Points.AddXY(time.ToOADate(), humi9);
                                chart1.Series[9].Points.AddXY(time.ToOADate(), humi10);                                foreach (var series in chart1.Series)
                                {
                                    while (series.Points.Count > 40)
                                    {
                                        series.Points.RemoveAt(0);
                                    }
                                }
                                ax.Minimum = chart1.Series[0].Points[0].XValue;
                                ax.Maximum =
                                    DateTime.FromOADate(chart1.Series[0].Points[0].XValue).AddMinutes
                                        (_timerInterval).ToOADate();
                                chart1.ResetAutoValues();
                                chart1.Invalidate();
                            };
 chart1.Invoke(deleRefresh);
在执行到invoke（）时就会弹出 索引超出范围
这种情况怎么解决呀