C# Chart 折线图 多条数据展示

private void btn_Click(object sender, EventArgs e)
{

DBHelper db = new DBHelper();
DataSet ds = db.GetDataList();
this.dataGridView1.DataSource = ds.Tables[0];

DataSet ds1 = db.GetResportLine();
DataSet ds2 = db.GetResportLine2();
DataSet ds3 = db.GetResportLine3();

DataTable dt1 = ds1.Tables[0];
DataTable dt2 = ds2.Tables[0];
DataTable dt3 = ds3.Tables[0];

//chart1.ChartAreas[0].AxisX.Maximum = 1000;//设定x轴的最大值
//chart1.ChartAreas[0].AxisY.Maximum = 100;//设定y轴的最大值

//chart1.ChartAreas[0].AxisX.Minimum = 1;//设定x轴的最小值
//chart1.ChartAreas[0].AxisY.Minimum = 0;//设定y轴的最小值

//第一条数据
Series ss = new Series("dt1"); //这里 dt1 ,dt2 任意取名称，但要唯一
ss.Points.DataBind(dt1.AsEnumerable(), "xzhou", "yzhou", "");
ss.XValueType = ChartValueType.DateTime; //设置X轴
ss.ChartType = SeriesChartType.Spline; //设置Y轴为折线
chart1.Series.Add(ss);

//第二条数据
Series ss2 = new Series("dt2");
ss2.Points.DataBind(dt2.AsEnumerable(), "xzhou2", "yzhou2", "");
ss2.XValueType = ChartValueType.DateTime; //设置X轴
ss2.ChartType = SeriesChartType.Spline; //设置Y轴为折线
chart1.Series.Add(ss2);

//第三条数据
Series ss3 = new Series("dt3");
ss3.Points.DataBind(dt3.AsEnumerable(), "xzhou2", "yzhou2", "");
ss3.XValueType = ChartValueType.DateTime; //设置X轴
ss3.ChartType = SeriesChartType.Spline; //设置Y轴为折线
chart1.Series.Add(ss3);

}