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POHow to create an async method in C# 4 according to the best practices?
 

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  1. POHow to create an async method in C# 4 according to the best practices?
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    <p>Consider the following code snippet:</p> <pre><code>public static Task&lt;string&gt; FetchAsync() { string url = "http://www.example.com", message = "Hello World!"; var request = (HttpWebRequest)WebRequest.Create(url); request.Method = WebRequestMethods.Http.Post; return Task.Factory.FromAsync&lt;Stream&gt;(request.BeginGetRequestStream, request.EndGetRequestStream, null) .ContinueWith(t =&gt; { var stream = t.Result; var data = Encoding.ASCII.GetBytes(message); Task.Factory.FromAsync(stream.BeginWrite, stream.EndWrite, data, 0, data.Length, null, TaskCreationOptions.AttachedToParent) .ContinueWith(t2 =&gt; { stream.Close(); }); }) .ContinueWith&lt;string&gt;(t =&gt; { var t1 = Task.Factory.FromAsync&lt;WebResponse&gt;(request.BeginGetResponse, request.EndGetResponse, null) .ContinueWith&lt;string&gt;(t2 =&gt; { var response = (HttpWebResponse)t2.Result; var stream = response.GetResponseStream(); var buffer = new byte[response.ContentLength &gt; 0 ? response.ContentLength : 0x100000]; var t3 = Task&lt;int&gt;.Factory.FromAsync(stream.BeginRead, stream.EndRead, buffer, 0, buffer.Length, null, TaskCreationOptions.AttachedToParent) .ContinueWith&lt;string&gt;(t4 =&gt; { stream.Close(); response.Close(); if (t4.Result &lt; buffer.Length) { Array.Resize(ref buffer, t4.Result); } return Encoding.ASCII.GetString(buffer); }); t3.Wait(); return t3.Result; }); t1.Wait(); return t1.Result; }); } </code></pre> <p>It should return <code>Task&lt;string&gt;</code>, send HTTP POST request with some data, return a result from webserver in a form of string and be as much efficient as possible.</p> <ul> <li>Did you spot any problems regarding async flow in the example above?</li> <li>Is it OK to have .Wait() inside .ContinueWith() in this example</li> <li>Do you see any other problems with this peace of code (keeping aside exception handling for now)?</li> </ul>
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    1. USAdam Baxter
    1. USGrief Coder
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      1. POHow to create an async method in C# 4 according to the best practices?
      1. USKonstantin Tarkus
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    1. COYou should accept some answers from your other questions
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    2. COYou might want to consider renaming your Task object as there is already a Task object in .NET 4. While you can make them work together, it may be easier to just change your nomenclature.
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      1. USErik Funkenbusch
    3. COMystere Man, I don't have any custom Task declarations. The Task type I am using is from .NET 4.0 BCL.
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