using multiple threads

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I have a lab exercise which is given in the MCTS 70-536.
I am failed to understand that what is "urls" in foreach loop, whether it is an object or......

C#

using System;
using System.Net;
using System.Threading;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            foreach (string url in urls)
                ThreadPool.QueueUserWorkItem(GetPage, url);
        }
        static void GetPage(object data)
        {
            string url = (string)data;

            WebResponse wr = WebRequest.Create(url).GetResponse();

            Console.WriteLine(url + ": " + wr.Headers["Content-Length"]);

            wr.Close();
        }
    }
}

Posted 16-Mar-12 1:30am

Parampreet.CCIT

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Pete O'Hanlon · Accepted Answer · 2012-03-16T01:38:00

Solution 1

Hmm. There seems to be some code missing here. Basically, urls would probably be a list of strings (or array of them), which contains each individual url that needs to be passed into the GetPage method as the data object.

To test it, before the foreach, add the following:

C#

List<string> urls = new List<string>();
urls.Add("http://www.codeproject.com/");
urls.Add("http://www.google.com/");

Posted 16-Mar-12 1:38am

Pete O'Hanlon

Updated 16-Mar-12 1:39am

v2

Comments

Parampreet.CCIT 19-Mar-12 7:00am

thank u very much sir for ur support, now this program works properly
but i still have a question that what is Content-length in it, what is the function of wr.Headers in it???
The output of the program only shows the content-length of codeproject.com not for google or any other site, why?

Pete O'Hanlon 19-Mar-12 7:56am

The issue you are facing here is that possibly the code will run to completion before it has a chance to retrieve the other sites. This is the whole nature of a threaded environment - things happen independently on background threads, and don't block the main thread from completing.

Parampreet.CCIT 27-Mar-12 7:02am

I can't getting your answer...

Parampreet.CCIT 27-Mar-12 7:07am

this program shows only the Content-length of codeproject.com not for any other site