wpf 使用 livechart columneries

如何解决wpf 使用 livechart columneries

当横坐标很大时，直方图的宽度几乎为0，这是什么原因？如何保持列宽不变，横坐标轴可以达到几万？

            ColumnSeries seriesPowerSave = new ColumnSeries();
            seriesPowerSave.Values = new ChartValues<ObservablePoint>();
            seriesPowerSave.DataLabels = true;
            seriesPowerSave.LabelPoint = p => p.Y.ToString();
            seriesPowerSave.Foreground = new SolidColorBrush(Color.Fromrgb(0,0));
            seriesPowerSave.Fill = new SolidColorBrush(Color.Fromrgb(70,130,180));
            seriesPowerSave.Title = "数量";
            seriesPowerSave.FontSize = 15;
            seriesPowerSave.Width = 10;
            seriesPowerSave.MinWidth = 10;

            for (int i = 0; i < len; i++)
            {
                double searchResult = ColumnStep * (i + 1);
                double start = i * ColumnStep;
                Labels[i] = (start.ToString("f0") + "~" + searchResult.ToString("f0"));
                int resultNumber = 0;
                foreach (var x in SelectedPatientResults)
                {
                    if (x.ReportResult != null)
                    {
                        if (double.Parse(x.ReportResult) >= searchResult - ColumnStep && double.Parse(x.ReportResult) <= searchResult)
                            resultNumber++;
                    }
                }

                seriesPowerSave.Values.Add(new ObservablePoint(Math.Round(ColumnStep * i,1),resultNumber));
            }