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POHow to use System.Media.SoundPlayer to asynchronously play a sound file?
 

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  1. POHow to use System.Media.SoundPlayer to asynchronously play a sound file?
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    <p>Here's a deceptively simple question:</p> <p><strong>What is the proper way to asynchronously play an embedded .wav resource file in Windows Forms?</strong></p> <p>Attempt #1:</p> <pre><code>var player = new SoundPlayer(); player.Stream = Resources.ResourceManager.GetStream("mySound"); player.Play(); // Note that Play is asynchronous </code></pre> <ul> <li>Good: doesn't block the UI thread</li> <li>Bad: SoundPlayer and the embedded resource stream are not immediately disposed.</li> </ul> <p>Attempt #2:</p> <pre><code>using (var audioMemory = Resources.ResourceManager.GetStream("mySound")) { using (var player = new SoundPlayer(audioMemory)) { player.Play(); } } </code></pre> <ul> <li>Good: UI thread is not blocked, SoundPlayer and audio memory stream are immediately disposed.</li> <li>Bad: Race condition! Play() is async, and if audio memory gets disposed before Play is done...boom! Runtime exception is thrown.</li> </ul> <p>Attempt #3:</p> <pre><code>using (var audioMemory = Resources.ResourceManager.GetStream("mySound")) { using (var player = new SoundPlayer(audioMemory)) { player.PlaySync(); } } </code></pre> <ul> <li>Good: Player and audio stream are immediately disposed.</li> <li>Bad: PlaySync blocks the UI thread</li> </ul> <p>Attempt #4:</p> <pre><code>ThreadPool.QueueUserWorkItem(ignoredState =&gt; { using (var audioMemory = Resources.ResourceManager.GetStream("mySound")) { using (var player = new SoundPlayer(audioMemory)) { player.PlaySync(); } } }); </code></pre> <ul> <li>Good: UI doesn't freeze, player and memory stream are immediately disposed.</li> <li>Bad: Because this fires often, we may run out of thread pool threads! See Larry Osterman's <a href="http://blogs.msdn.com/larryosterman/archive/2009/06/29/what-s-wrong-with-this-code-part-26-the-answer.aspx" rel="noreferrer">what's wrong with this code part 26</a>.</li> </ul> <p>It seems like SoundPlayer should have a PlayAsyncCompleted event. Unfortunately, no such event exists. Am I missing something? What's the proper way to asynchronously play a .wav embedded resource in Windows Forms?</p>
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