BasicBarChart.aspx.cs

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using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Xml.Linq;

namespace WebChart
{
    public partial class BasicBarChart : System.Web.UI.Page
    {
        public string line1 = "";
        public string line2 = "";
        public string line3 = "";
        protected void Page_Load(object sender, EventArgs e)
        {
            Ltldate.Text = DateTime.Now.ToString("yyyy-MM-dd");
            Ltltime.Text = DateTime.Now.ToString("HH:mm");
            GetDta();
        }


        public void GetDta()
        {
            DataTable dtdata = new DataTable();
            dtdata.Columns.Add("LineName");
            dtdata.Columns.Add("Qty");


            Random random = new Random();

            DataRow dr = dtdata.NewRow();
            dr[0] = "line1";
            dr[1] = random.Next(200, 501);//通过名称赋值
            dtdata.Rows.Add(dr);


            DataRow dr1 = dtdata.NewRow();
            dr1[0] = "line2";
            dr1[1] = random.Next(200, 501);//通过名称赋值
            dtdata.Rows.Add(dr1);


            DataRow dr3 = dtdata.NewRow();
            dr3[0] = "line3";
            dr3[1] = random.Next(200, 501);//通过名称赋值
            dtdata.Rows.Add(dr3);

            if (dtdata.Rows.Count > 0)
            {
                if (dtdata.Select($"LineName='line1'").Length != 0)
                {
                    line1 = dtdata.Select($"LineName='line1'")[0]["Qty"].ToString();
                }
                if (dtdata.Select($"LineName='line2'").Length != 0)
                {
                    line2 = dtdata.Select($"LineName='line2'")[0]["Qty"].ToString();
                }