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[];

         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 = ; 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 = ;
             maxTimer.Enabled = true;
         }

         public void Rec()
         {
             try
             {
                 for (int i = ; 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();
         }

     }
 }