你好：
你可以检查Thread.IsAlive属性来判断一个线程是否在执行状态，具体的线程状态可以查看ThreadState属性。
如果想跟踪自己创建的所有线程，那么可以创建一个自定义的线程池，比如如下：
public class MyThreadPool
{
private IList<Thread> _threads;
private readonly int MAX_THREADS = 25;
public MyThreadPool()
{
_threads = new List<Thread>();
}
public void LaunchThreads()
{
for (int i = 0; i < MAX_THREADS;i++)
{
Thread thread = new Thread(ThreadEntry);
thread.IsBackground = true;
thread.Name = string.Format("MyThread{0}",i);
_threads.Add(thread);
thread.Start();
}
}
public void KillThread(int index)
{
string id = string.Format("MyThread{0}",index);
foreach (Thread thread in _threads)
{
if (thread.Name == id)
thread.Abort();
}
}
void ThreadEntry()
{
}
}
通过遍历集合中的线程名称来获取到想要的线程，然后判断线程的状态。
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