C# C:如何更改图表中特定线条的颜色？

我不想这样改变整个系列：

chart1.Series["test1"].Color = Color.Red;

private void dispatcherTimer_Tick(object sender, EventArgs e)
{
    var r = new Random();
    int i = chart1.Series["test1"].Points.AddXY(r.Next(0, 10), r.Next(0, 10));

    try
    {
        chart1.Series["test1"].Points[i - 1].Color = Color.LightPink;
        chart1.Series["test1"].Points[i - 2].Color = Color.LightPink;
        chart1.Series["test1"].Points[i - 3].BorderDashStyle = ChartDashStyle.Dash;
        chart1.Series["test1"].Points[i - 4].BorderDashStyle = ChartDashStyle.Dash;
         chart1.Series["test1"].Points.RemoveAt(i - 5);
    }
    catch { }
}

相反，我想更改各条线的颜色，如下所示：

chart1.Series["test1"].Color = Color.Red;

private void dispatcherTimer_Tick(object sender, EventArgs e)
{
    var r = new Random();
    int i = chart1.Series["test1"].Points.AddXY(r.Next(0, 10), r.Next(0, 10));

    try
    {
        chart1.Series["test1"].Points[i - 1].Color = Color.LightPink;
        chart1.Series["test1"].Points[i - 2].Color = Color.LightPink;
        chart1.Series["test1"].Points[i - 3].BorderDashStyle = ChartDashStyle.Dash;
        chart1.Series["test1"].Points[i - 4].BorderDashStyle = ChartDashStyle.Dash;
         chart1.Series["test1"].Points.RemoveAt(i - 5);
    }
    catch { }
}

---

但是，这不起作用，我不明白为什么。

问题是SerieChartType被设置为FastLine而不是Line

这不起作用：

chart1.Series["test1"].ChartType = SeriesChartType.FastLine;

这项工作：

chart1.Series["test1"].ChartType = SeriesChartType.Line;