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    <p>Interesting problem. I came up with two approaches. The first is based on PLinq and the second is based on te Rx Framework.</p> <p>The first one iterates through the files in parallel. The second one generates asynchronously the files from the directory.</p> <p>Here is how it looks like in a much simplified version (The first method does require .Net 4.0 since it uses PLinq)</p> <pre><code>string direcory = "Mydirectory"; var jpegFiles = System.IO.Directory.EnumerateFiles(direcory,"*.jpg"); // -- PLinq -------------------------------------------- jpegFiles .AsParallel() .Select(imageFile =&gt; new {OldLocation = imageFile, NewLocation = GenerateCopyLocation(imageFile) }) .Do(fileInfo =&gt; { if (!File.Exists(fileInfo.NewLocation ) || (File.GetCreationTime(fileInfo.NewLocation)) != (File.GetCreationTime(fileInfo.NewLocation))) File.Copy(fileInfo.OldLocation,fileInfo.NewLocation); }) .Run(); // ----------------------------------------------------- //-- Rx Framework --------------------------------------------- var resetEvent = new AutoResetEvent(false); var doTheWork = jpegFiles.ToObservable() .Select(imageFile =&gt; new {OldLocation = imageFile, NewLocation = GenerateCopyLocation(imageFile) }) .Subscribe( fileInfo =&gt; { if (!File.Exists(fileInfo.NewLocation ) || (File.GetCreationTime(fileInfo.NewLocation)) != (File.GetCreationTime(fileInfo.NewLocation))) File.Copy(fileInfo.OldLocation,fileInfo.NewLocation); },() =&gt; resetEvent.Set()); resetEvent.WaitOne(); doTheWork.Dispose(); // ----------------------------------------------------- </code></pre>
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    1. POParallel programming in C#
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    1. USJohnny Blaze
    1. USJohnny Blaze
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    1. COPLinq requires .net 4.0, isn't that correct?
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      1. USAlxandr
    2. COYes it does require .Net 4.0
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      1. USJohnny Blaze
    3. CO+1 for mentioning and providing an example for the "Rx" approach.
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      1. USErick Brown
 

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