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copied!<p>If you're willing to replace your application's <code>Thread</code> creations with another wrapper class, said wrapper class can track the active and inactive <code>Thread</code>s for you. Here's a minimal workable shell of such a wrapper:</p> <pre><code>namespace ThreadTracker { using System.Collections.Generic; using System.Collections.ObjectModel; using System.Threading; public class TrackedThread { private static readonly IList<Thread> threadList = new List<Thread>(); private readonly Thread thread; private readonly ParameterizedThreadStart start1; private readonly ThreadStart start2; public TrackedThread(ParameterizedThreadStart start) { this.start1 = start; this.thread = new Thread(this.StartThreadParameterized); lock (threadList) { threadList.Add(this.thread); } } public TrackedThread(ThreadStart start) { this.start2 = start; this.thread = new Thread(this.StartThread); lock (threadList) { threadList.Add(this.thread); } } public TrackedThread(ParameterizedThreadStart start, int maxStackSize) { this.start1 = start; this.thread = new Thread(this.StartThreadParameterized, maxStackSize); lock (threadList) { threadList.Add(this.thread); } } public TrackedThread(ThreadStart start, int maxStackSize) { this.start2 = start; this.thread = new Thread(this.StartThread, maxStackSize); lock (threadList) { threadList.Add(this.thread); } } public static int Count { get { lock (threadList) { return threadList.Count; } } } public static IEnumerable<Thread> ThreadList { get { lock (threadList) { return new ReadOnlyCollection<Thread>(threadList); } } } // either: (a) expose the thread object itself via a property or, // (b) expose the other Thread public methods you need to replicate. // This example uses (a). public Thread Thread { get { return this.thread; } } private void StartThreadParameterized(object obj) { try { this.start1(obj); } finally { lock (threadList) { threadList.Remove(this.thread); } } } private void StartThread() { try { this.start2(); } finally { lock (threadList) { threadList.Remove(this.thread); } } } } } </code></pre> <p>and a quick test driver of it (note I do not iterate over the list of threads, merely get the count in the list):</p> <pre><code>namespace ThreadTracker { using System; using System.Threading; internal static class Program { private static void Main() { var thread1 = new TrackedThread(DoNothingForFiveSeconds); var thread2 = new TrackedThread(DoNothingForTenSeconds); var thread3 = new TrackedThread(DoNothingForSomeTime); thread1.Thread.Start(); thread2.Thread.Start(); thread3.Thread.Start(15); while (TrackedThread.Count > 0) { Console.WriteLine(TrackedThread.Count); } Console.ReadLine(); } private static void DoNothingForFiveSeconds() { Thread.Sleep(5000); } private static void DoNothingForTenSeconds() { Thread.Sleep(10000); } private static void DoNothingForSomeTime(object seconds) { Thread.Sleep(1000 * (int)seconds); } } } </code></pre> <p>Not sure if you can go such a route, but it will accomplish the goal if you're able to incorporate at an early stage of development.</p>

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