从kepware定时取web api内容

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 Newtonsoft.Json.Linq;
using Newtonsoft.Json;
using System.Threading.Tasks;
using System.Net.Sockets;
using System.IO;
using System.Net;
using System.Timers;


//从kepware取web api内容


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

        string[] nArray = new string[100];

        private void Form1_Load(object sender, EventArgs e)
        {
            

         //遍历本机的kep web api
            string ValueName = Get("http://192.168.1.9:39320/iotgateway/browse");
            JObject json1 = (JObject)JsonConvert.DeserializeObject(ValueName);
            JArray array = (JArray)json1["browseResults"];
            //MessageBox.Show(array.ToString());
            string aa = "";
            foreach (var jObject in array)
            {
                //赋值属性
                aa = jObject["id"].ToString();//获取字符串中id值
                listBox1.Items.Add(aa);
            }

            for (int i = 0; i < listBox1.Items.Count; i++)
            {
                nArray[i] = listBox1.GetItemText(i);
               
            }

            System.Timers.Timer maxTimer = new System.Timers.Timer();
            maxTimer.Elapsed += new ElapsedEventHandler(Tmr_Elapsed);
            // 设置引发时间的时间间隔 此处设置为１秒（１０００毫秒）
            maxTimer.Interval = 3000;
            maxTimer.Enabled = true;
        }

        public void Rec()
        {
            try
            {
                for (int i = 0; i < listBox1.Items.Count; i++)
                {
                    string value = Get("http://127.0.0.1:39320/iotgateway/read?ids=" + listBox1.Items[i].ToString());
                    JObject json2 = (JObject)JsonConvert.DeserializeObject(value);
                    JArray array2 = (JArray)json2["readResults"];
                    //MessageBox.Show(json2.ToString());
                    //MessageBox.Show(array2.ToString());
                    string aa2 = "";
                    foreach (var jObject in array2)
                    {
                        //赋值属性
                        aa2 = jObject["v"].ToString();//获取字符串中id值
                        listBox2.Items.Add(aa2);
                    }
                }
            }
            catch
            { }
        }

        private void Tmr_Elapsed(object sender, ElapsedEventArgs e)
        {
            listBox2.Items.Clear();
            Rec();
        }
        


        /// <summary>
        /// 指定Url地址使用Get 方式获取全部字符串
        /// </summary>
        /// <param name="url">请求链接地址</param>
        /// <returns></returns>
        public static string Get(string url)
        {
            string result = "";
            HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
            HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
            Stream stream = resp.GetResponseStream();
            try
            {
                //获取内容
                using (StreamReader reader = new StreamReader(stream))
                {
                    result = reader.ReadToEnd();
                }
            }
            finally
            {
                stream.Close();
            }
            return result;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Rec();
        }

    }
}