The real-time graph only shows the data of the last minute on the x-axis, and the VisibleRange property setting is invalid

The real-time graph only shows the data of the last minute on the x-axis, and the VisibleRange property setting is invalid

private void InitializeChart()
{
    for (int i = 0; i < 50; i++)
    {
        var dataSeries = new XyDataSeries<DateTime, double> { FifoCapacity = 10 };
        Color color = Color.FromArgb(0xAA, (byte)random.Next(1, 256), (byte)random.Next(1, 256), (byte)random.Next(1, 256));
        var lineSeries = new FastLineRenderableSeries()
        {
            DataSeries = dataSeries,
            StrokeThickness = 2,
            Stroke = color
        };
        sciChart.RenderableSeries.Add(lineSeries);
        fastLines.Add(dataSeries);
    }
}

private void StartTimer()
{
var timer = new Timer(1000);
timer.Elapsed += (sender, e) =>
{
Dispatcher.Invoke(() =>
{
var currentDate = DateTime.Now;
for (int i = 0; i < fastLines.Count; i++)
{
var xAxis = sciChart.XAxes.OfType().FirstOrDefault();
if (xAxis != null&& xAxis.DataRange!=null)
{
var newRange = new DateRange(currentDate.AddSeconds(-60), currentDate);

                fastLines[i].XRange.Min = newRange.Min;
                //xAxis.VisibleRange = newRange;
                Application.Current.Dispatcher.BeginInvoke((Action)(() =>
                {
                    xAxis.InvalidateElement();
                }));
                sciChart.ZoomExtents();
            }
            if (fastLines[i].Count > 5 &&i>40)
            {
                break;
            }
            double y = (i + 1);
            fastLines[i].Append(currentDate, y);
        }
    });
};
timer.Start();

}