菜鸟求解~~~

Question

我想做一个程序，需要每隔5分钟去请求一个URL，在请求这个URL的时候会返回一些固定格式的信息，我要接收它，并存入数据库中，如果请求超时的话我需要程序提示报错
请问这个功能的实现思路是什么？具体需要用到哪些类呢？

Answer 1

JS 设置settimeout 调用webservice或者一般处理程序。返回结果。我是这样考虑的

Answer 2

可以设置session过期时间，来判断。

Answer 3

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.IO;namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }        private void button1_Click(object sender, EventArgs e)
        {
            
        }        public static string GetResponse(string url, string postData, string method, string RequestUri)
        {
            HttpWebRequest request = null;
            try
            {
                request = (HttpWebRequest)WebRequest.Create(url);
            }
            catch
            {
                return "";
            }            if (request == null)
                return "";            request.Method = method;
            request.Timeout = 300000;
            request.KeepAlive = true;
            request.AllowAutoRedirect = true;
            request.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
            request.UserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; EmbeddedWB 14.52 from: http://www.bsalsa.com/ EmbeddedWB 14.52; .NET CLR 2.0.50727; CIBA)";            request.CookieContainer = new CookieContainer();            try
            {
                if (RequestUri != null && RequestUri != "")
                    request.Referer = RequestUri;
                else
                    request.Referer = request.RequestUri.ToString();
            }
            catch
            {
            }            request.ContentType = "application/x-www-form-urlencoded";            HttpWebResponse webresponse = null;
            try
            {
                if (postData.Length > 0)
                {
                    byte[] loginDataBytes = Encoding.Default.GetBytes(postData);
                    request.ContentLength = loginDataBytes.Length;
                    Stream stream = request.GetRequestStream();
                    stream.Write(loginDataBytes, 0, loginDataBytes.Length);
                    stream.Close();
                }
                webresponse = request.GetResponse() as HttpWebResponse;
                if (webresponse != null)
                {
                    StreamReader reader = new StreamReader(webresponse.GetResponseStream(), Encoding.UTF8);
                    string strHTML = reader.ReadToEnd();                    if (reader != null)
                        reader.Close();                    return strHTML;
                }
            }
            catch
            {
            }
            finally
            {
                if (webresponse != null)
                {
                    webresponse.Close();
                    webresponse = null;
                }
                if (request != null)
                {
                    request.Abort();
                    request = null;
                }
            }            return "";
        }        private void timer1_Tick(object sender, EventArgs e)
        {
            string strHTML = GetResponse("http://www.sina.com");
            //正则表达式分析HTML代码
        }
    }
}

Answer 4

HttpWebRequest 
JS都成了.

Answer 5

System.Timers.Timer myTimer = new System.Timers.Timer();
myTimer.Elapsed += new System.Timers.ElapsedEventHandler(OnTimedEvent);
myTimer.Interval = 1000;
myTimer.Enabled = true;
private static void OnTimedEvent(object source, System.Timers.ElapsedEventArgs e)
{
HttpWebRequest myHttpWebRequest = (HttpWebRequest)WebRequest.Create("");
myHttpWebRequest .Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
myHttpWebRequest .UserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; EmbeddedWB 14.52 from: http://www.bsalsa.com/ EmbeddedWB 14.52; .NET CLR 2.0.50727; CIBA)";
HttpWebResponse myHttpWebResponse = (HttpWebResponse)myHttpWebRequest.GetResponse();
Stream receiveStream = myHttpWebResponse.GetResponseStream();
}