Question

c#/asp.net chart Y轴刻度显示

通过下拉选择菜单选择不同的数据，这个上面的y轴最小值是0 最大值是50，我想得到Y轴的刻度，用判断（最大值减去最小值除以4）请问具体代码该如何写

Answer 1

c#/asp.net chart Y轴刻度显示设置的完整代码如下：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Windows.Forms.DataVisualization.Charting;

namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void Form1_Load(object sender, EventArgs e)
{
Series s1 = new Series();
Series s2 = new Series();
Random r = new Random();
for (int i = 1; i < 13; i++)
{
s1.Points.AddXY(i, r.Next(20, 30));
s2.Points.AddXY(i, r.Next(10, 30));
}
chart1.Series.Add(s1);
chart1.Series.Add(s2);
chart1.ChartAreas[0].AxisX.MajorGrid.LineColor = Color.Green;
DateTime t = DateTime.Parse("8:30");
for (int i = 1; i < 26; i++)
{
if (i%2==1)
{
CustomLabel label = new CustomLabel();
label.Text = t.ToShortTimeString() ;
label.ToPosition =i;
chart1.ChartAreas[0].AxisX.CustomLabels.Add(label);
label.GridTicks = GridTickTypes.Gridline;
t = t.AddHours(1);
}

}
}
}
}

Answer 2

Chart1.ChartAreas["ChartArea1"].AxisY.Maximum = 1;//设置Y轴最大值
Chart1.ChartAreas["ChartArea1"].AxisY.Minimum = 0;是在Y轴最小值
Chart1.ChartAreas["ChartArea1"].AxisY.Interval = 1;//设置每个刻度的跨度

追问

我有一个下拉选择菜单，如果选中不同的选项，Y轴上面的刻度会改变，不能写死，我知道是用y轴最大值减去y轴最小值然后除以4就能得到刻度，但我不会写这个判断

追答

Chart1.ChartAreas["ChartArea1"].AxisY.Interval =(Chart1.ChartAreas["ChartArea1"].AxisY.Maximum+Chart1.ChartAreas["ChartArea1"].AxisY.Minimum)/4