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    <p>The first example is the most common pattern. The second to me is just a variation of the first with a less semantic naming convention. </p> <p>The third example I would stay away from. Exceptions shouldn't be used to direct the normal control of flow. <a href="http://msdn.microsoft.com/en-us/library/vstudio/ms229030(v=vs.100).aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/vstudio/ms229030(v=vs.100).aspx</a></p> <p>EDIT: I take that back. The second example looked similar but instead it asks the controller to determine whether the task can run or not. If the "runability" is based solely on the content of the task object and not based on some state of the controller then I see no need to complicate things by putting the check in the controller. If the logic is similar enough I would use a base task class to keep things DRY.</p> <p>EDIT: I'm not clear on your exact use case but so this could be off base completely but to me seems like the controller would ask the task if it is ready to run and if so it would run the task and if not it would do something else.</p> <pre><code>if (task.CanRun) { controller.Run(task); } else { //Do whatver. } </code></pre> <p>Furthermore, if the logic is encapsulated within the controller regarding what should be done when a task cannot be run then perhaps the run method should return a boolean so the caller can do something additional if need be. In that scenario the caller just passes the task to the controller run method and inside there the controller check if the task can run or not and acts accordingly.</p>
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    1. POPossible ways to check if a routine can run (and run it) in C#
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    1. USSacrilege
    1. USSacrilege
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    1. COInteresting. According to the link I provided in the question, the task should pre-test itself when being called by the controller, which in turn just handles any exception in `Task.run()` (outside normal control flow). The examples are just suggestions, since I have never done that before, but apparently it is a good practice in production-quality code.
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    2. CO(for the sake of "enlightenment" about this design-pattern, which Microsoft calls Pipes-And-Filters, the following post is absolutely worth reading: http://keyvan.io/pipes-and-filters-pattern-in-net)
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