mschart实时显示数据的程序 为何运行后没有曲线出现 没有报错 没有警告 只生成一个空的图表

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)

        {

                 

        SetChart();



        timer1.Interval = 1000;



        timer1.Start();

        }



        private Random rand = new Random();



        public void SetChart()

        {

            ChartArea cha = new ChartArea("ChartArea1");

            cha.Area3DStyle.Enable3D = true;

            chart1.ChartAreas.Add(cha);



            Legend lgY = new Legend("Legend1");

            lgY.IsTextAutoFit = true;

            lgY.Docking = Docking.Bottom;

            chart1.Legends.Add(lgY);



            Series SerY = new Series("Series1");

            SerY.ChartArea = "ChartArea1";

            SerY.ChartType = System.Windows.Forms.DataVisualization.Charting.SeriesChartType.Line;

            SerY.IsVisibleInLegend = true;

            SerY.Legend = "Legend1";

            SerY.LegendText = "Yvalue";

            SerY.YValueMembers = "Yvalue";

           

            chart1.Series.Add(SerY);

            chart1.Series[0].XValueType = System.Windows.Forms.DataVisualization.Charting.ChartValueType.DateTime;

            //chart1.ChartAreas[0].AxisX.LabelStyle.Format = "HH:mm:ss" + "yy/MM/dd";

        }



        private void timer1_tick(object sender, System.EventArgs e)

        {

            double doubledate = DateTime.Now.ToOADate();

            double doubledate2 = DateTime.Now.AddSeconds(-13).ToOADate();

            chart1.ChartAreas[0].AxisX.Maximum = doubledate;

            chart1.ChartAreas[0].AxisX.Minimum = doubledate2;



            chart1.Series[0].Points.AddXY(DateTime.Now, rand.Next(1, 101));

            

        }



        protected void Chart1_Click(object sender, System.EventArgs e) { }  

    }

}

补充：.NET技术 ,  C#

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