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POGeneric ThreadPool in .NET
 

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    <p>Here's a relatively common task for me, and, I think, for many a .NET programmer:<br> I want to use the .NET ThreadPool for scheduling worker threads that need to process a given type of tasks.</p> <p>As a refresher, the signatures for the queueing method of the ThreadPool and its associated delegate are:</p> <pre><code>public static bool QueueUserWorkItem ( WaitCallback callBack, Object state ) public delegate void WaitCallback (Object state) </code></pre> <p>Therefore, a typical generic worker thread class would look something like:</p> <pre><code>public class Worker&lt;T&gt; { public void schedule(T i_task) { ThreadPool.QueueUserWorkItem(execute, i_task) } private void execute(Object o){ T task = (T)o; //What happened to the type safety? executeTask(task); } private void executeTask(T i_task){ //process i_task } } </code></pre> <p>Notice the type of the <code>state</code> parameter? It's <em><code>Object</code></em> !</p> <p>What's the compelling reason why the .NET team chose not to make the <code>QueueUserWorkItem</code> method (or the whole <code>ThreadPool</code> class) generic? I can't believe they just overlooked it.</p> <p>Here's how I'd like to see it:</p> <pre><code>//in the ThreadPool class: public static bool QueueUserWorkItem&lt;T&gt; ( WaitCallback&lt;T&gt; callBack, T state ) public delegate void WaitCallback&lt;T&gt; (T state) </code></pre> <p>This would make the worker class type-safe (and a lot clearer, IMHO):</p> <pre><code>public class Worker&lt;T&gt; { public void schedule(T i_task) { ThreadPool.QueueUserWorkItem&lt;T&gt;(execute, i_task) } private void execute(T i_task){ //process i_task } } </code></pre> <p>I must be missing something.</p>
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