C# 图表Y轴在自动缩放和手动范围之间切换

我想创建一个图表，这样用户可以选择自动缩放y轴，也可以在运行时手动更改轴。我可以自动缩放，直到y轴未使用“向上向下”进行更改，但是，一旦我更改任何“向上向下”，自动缩放将无响应

 private void numUD_Graph_Ymax_ValueChanged(object sender, EventArgs e)
    {
        try
        {
            int newmax = (int)numUD_Graph_Ymax.Value;
            int allowedmin = (int)numUD_Graph_Ymax.Minimum;
            int allowedmax = (int)numUD_Graph_Ymax.Maximum;

            if (newmax >= allowedmin && newmax <= allowedmax && newmax > chart.ChartAreas[0].AxisY.Minimum)
            {
                chart.ChartAreas[0].AxisY.Maximum = newmax;
                chart.Update();
            }
        }
        catch (Exception exception)
        {
            MessageBox.Show(exception.ToString());
        }
    }

    private void numUD_Graph_Ymin_ValueChanged(object sender, EventArgs e)
    {
        try
        {
            int newmin = (int)numUD_Graph_Ymin.Value;
            int allowedmin = (int)numUD_Graph_Ymin.Minimum;
            int allowedmax = (int)numUD_Graph_Ymin.Maximum;

            if (newmin >= allowedmin && newmin <= allowedmax && newmin < chart.ChartAreas[0].AxisY.Maximum)
            {
                chart.ChartAreas[0].AxisY.Minimum = newmin;
                chart.Update();
            }
        }
        catch (Exception exception)
        {
            MessageBox.Show(exception.ToString());
        }
    }

---

我哪里做错了？如何在数字升降中自动缩放和加载新坐标，同时还允许用户使用升降进一步修改图形。

在设置了一个

轴
的
最小值和/或
最大值后，恢复自动缩放的关键是重置（全部）这些价值观：

private void btn_AutoSize_Click(object sender, EventArgs e)
{
    chart.ChartAreas[0].AxisX.Minimum = double.NaN;  /// <-- this is the magic 'number'
    chart.ChartAreas[0].AxisX.Maximum = double.NaN;
    chart.ChartAreas[0].AxisY.Minimum = double.NaN;
    chart.ChartAreas[0].AxisY.Maximum = double.NaN;


 // not quite sure about these lines
 /*  
    chart.ChartAreas[0].RecalculateAxesScale();  
    chart.Update();
    updateUI();

 */

}

如果只想为一个轴启用自动缩放，不确定为什么要为两个轴都设置代码

private void btn_AutoSize_Click(object sender, EventArgs e)
{
    chart.ChartAreas[0].AxisX.Minimum = double.NaN;  /// <-- this is the magic 'number'
    chart.ChartAreas[0].AxisX.Maximum = double.NaN;
    chart.ChartAreas[0].AxisY.Minimum = double.NaN;
    chart.ChartAreas[0].AxisY.Maximum = double.NaN;


 // not quite sure about these lines
 /*  
    chart.ChartAreas[0].RecalculateAxesScale();  
    chart.Update();
    updateUI();

 */

}

private void cbx_AutoRange_CheckedChanged(object sender, EventArgs e)
{
    if (cbx_AutoRange.Checked)
    {
        chart.ChartAreas[0].AxisX.Minimum = double.NaN;
        chart.ChartAreas[0].AxisX.Maximum = double.NaN;
        chart.ChartAreas[0].AxisX.Interval = double.NaN;
        chart.ChartAreas[0].AxisY.Minimum = double.NaN;
        chart.ChartAreas[0].AxisY.Maximum = double.NaN;

        numUD_Graph_Xmin.Enabled = false;
        numUD_Graph_Xmax.Enabled = false;
        numUD_Graph_XInterval.Enabled = false;
        numUD_Graph_Ymin.Enabled = false;
        numUD_Graph_Ymax.Enabled = false;

    }
    else
    {
        numUD_Graph_Xmin.Enabled = true;
        numUD_Graph_Xmin.Value = (decimal)chart1.Series[0].Points.FindMinByValue().XValue;
        numUD_Graph_Xmax.Value = (decimal)chart1.Series[0].Points.FindMaxByValue().XValue;
      //.. etc
      //.. etc

    }

}