C# Windows threads with IAsyncResult

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C#

Windows

threads

asynchronous

Hello,

I'm developing an C# windows application to pull data from main url and then I get the inner url's from main url data and then call the thread to get each inner url data.

The same is working but in the process unless and until all inner url data is not fetched the main url data extraction is stuck.

Like main url has 50 inner url, it runs all 50 urls and then goto next of main url.
But I want to run both threads parallel.

Below is the code : http://msdn.microsoft.com/en-IN/library/system.net.httpwebrequest.begingetresponse(v=vs.95).aspx

public class RequestState
{
        public string _urlHtml = "";
        public bool isCompleted = false;

  // This class stores the State of the request.
  const int BUFFER_SIZE = 1024;
  public StringBuilder requestData;
  public byte[] BufferRead;
  public HttpWebRequest request;
  public HttpWebResponse response;
  public Stream streamResponse;

  public RequestState()
  {
    BufferRead = new byte[BUFFER_SIZE];
    requestData = new StringBuilder("");
    request = null;
    streamResponse = null;
  }
}

public class HttPagent
{
public static ManualResetEvent allDone= new ManualResetEvent(false);
  const int BUFFER_SIZE = 1024;


        public void GetAsyncHtml(string url)
        {
            try
            {
                var uri = new Uri(url);

                // Create a HttpWebrequest object to the desired URL.
                var myHttpWebRequest1 = (HttpWebRequest)WebRequest.Create(uri);

                // Create an instance of the RequestState and assign the previous myHttpWebRequest1
                // object to it's request field.  
                var myRequestState = new RequestState();
                myRequestState.request = myHttpWebRequest1;

                // Start the asynchronous request.
                IAsyncResult result =
                  myHttpWebRequest1.BeginGetResponse(RespCallback, myRequestState);

            }
            catch (WebException e1)
            {
                _urlHtml = "MZon-GetDataERROR" + e1.Message;
                isCompleted = true;
            }
            catch (Exception e2)
            {
                _urlHtml = "MZon-GetDataERROR" + e2.Message;
                isCompleted = true;
            }
        }

        private void RespCallback(IAsyncResult asynchronousResult)
        {
            try
            {
                // State of request is asynchronous.
                RequestState myRequestState = (RequestState)asynchronousResult.AsyncState;
                HttpWebRequest myHttpWebRequest2 = myRequestState.request;
                myRequestState.response = (HttpWebResponse)myHttpWebRequest2.EndGetResponse(asynchronousResult);

                // Read the response into a Stream object.
                Stream responseStream = myRequestState.response.GetResponseStream();
                myRequestState.streamResponse = responseStream;

                // Begin the Reading of the contents of the HTML page and print it to the console.
                if (responseStream != null)
                {
                    IAsyncResult asynchronousInputRead = responseStream.BeginRead(myRequestState.BufferRead, 0,
                                                                                  BUFFER_SIZE,
                                                                                  new AsyncCallback(ReadCallBack),
                                                                                  myRequestState);
                }
            }
            catch (WebException e)
            {
                Console.WriteLine(e.Message);
                isCompleted = true;
            }
        }

        //Read html callback
        private void ReadCallBack(IAsyncResult asyncResult)
        {
            try
            {
                RequestState myRequestState = (RequestState)asyncResult.AsyncState;
                Stream responseStream = myRequestState.streamResponse;
                int read = responseStream.EndRead(asyncResult);

                // Read the HTML page and then do something with it
                if (read > 0)
                {
                    myRequestState.requestData.Append(Encoding.UTF8.GetString(myRequestState.BufferRead, 0, read));
                    IAsyncResult asynchronousResult = responseStream.BeginRead(myRequestState.BufferRead, 0, BUFFER_SIZE,
                                                                               new AsyncCallback(ReadCallBack),
                                                                               myRequestState);
                }
                else
                {
                    if (myRequestState.requestData.Length > 1)
                    {
                        string stringContent;
                        stringContent = myRequestState.requestData.ToString();
                        _urlHtml = stringContent;
                    }

                    responseStream.Close();
                    allDone.Set();
                    isCompleted = true;
                }

            }
            catch (WebException e)
            {
                Console.WriteLine(e.Message);
            }
        }
}

Button click

_thMain = new Thread(MainPageThreadfunction)
                        {
                            Priority = ThreadPriority.Highest,
                            IsBackground = true
                        };
                    _thMain.Start();

Thread functions

        //Main page thread function
        private void MainPageThreadfunction()
        {
var uri = "https://www.TESTSITE.com/search?page=";


for(int i=0; i<5; i++)
{

 //Get page data
                var data = "";
var link = uri+ i;
                var oPagent = new HttPagent();
                oPagent.GetAsyncHtml(link );

                while (!oPagent.isCompleted)
                {
                    Application.DoEvents();
                }

                data = oPagent._urlHtml;

// GET INNER LINKS CODE HERE... I USED REGULAR EXPRESSION

 MatchCollection mc = Regex.Matches(data, "REGULAREXPRESSION",
                                                   RegexOptions.IgnoreCase);

                foreach (Match match in mc)
                {
var URL= match.Groups["URL"].Value;
 var _thInner = new Thread(() => InnerPageThreadfunction(URL);
                        _thInner.Start();
}



}
}

      
        private void InnerPageThreadfunction(string url)
        {

//Inner thread url extract code here
}

Please check the code and let me know where i'm wrong.

Thanks
Kapil