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POHow to Convert Synchronous 4.0 to ASynchronous in C# 4.5
 

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  1. POHow to Convert Synchronous 4.0 to ASynchronous in C# 4.5
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    <p>I am having a hard time convert the below code which i have created in 4.0 to 4.5 using HttpClient.</p> <p>According to my understand i guess if i create multiple web requests in the GUI thread itself without blocking the GUI if i got with asynchronous requeest. </p> <p>how to convert the below code to Asynchronous using HttpClient in 4.5</p> <pre><code>// This is what called when button is clicked Task t3 = new Task(SpawnTask); t3.Start(); //if noofthreads are less 50 then GUI is woking fine.. if number increases then takes much time for repaint.. //where as other softwares are working without any problem even if the threads are more than 500!! in the same system public void SpawnTask() { try { ParallelOptions po = new ParallelOptions(); po.CancellationToken = cts.Token; po.MaxDegreeOfParallelism = noofthreads; Parallel.ForEach( urls, po, url =&gt; checkpl(url)); } catch (Exception ex) { } } public void checkpl(string url) { try { HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url); request.Timeout = 60*1000; HttpWebResponse response = (HttpWebResponse)request.GetResponse(); string stext = ""; using (BufferedStream buffer = new BufferedStream(response.GetResponseStream())) { using (StreamReader reader = new StreamReader(buffer)) { stext = reader.ReadToEnd(); } } response.Close(); if (stext .IndexOf("domainname.com") != -1) { tfound = tfound + 1; string lext = "Total Found : "+tfound.ToString(); label3.BeginInvoke(new InvokeDelegate(UpdateLabel), ltext); slist.Add(url); textBox2.BeginInvoke(new InvokeDelegate4(UpdateText), "Working Url " + url); } } catch (Exception ex) { } } </code></pre>
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    1. CODoes this code not work when you upgrade? Are you obliged to upgrade? Often in production code, leaving legacy areas untouched is a good way to keep your defect count down. Microsoft go to great lengths to not introduce breaking changes so that you can do this!
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    2. COCode works fine after the update.. As i said if number of threads increases more than 50.. the GUI is not responsive and some times the controls are not loading http://oi40.tinypic.com/1491e7n.jpg . so some one suggested me to go with async and i see that 4.5 provides easy solutions for this.
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    3. COBTW, there is no C# 4.5. There is C# 5.0 and .Net 4.5.
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