多线程实现Thread.Start()与ThreadPool.QueueUserWorkItem两种方式对比

public void doSomething()
{
     OnBegin(new EventArgs());

     // someone does something here
     var r = new Random();
     int sleepTime = r.Next(3000, 180000);
     Thread.Sleep(900000);

    OnCompleted(new EventArgs());
}

doSomething

workThreads = new Thread[NUMBER_OF_THREADS];

for (var i = 0; i < NUMBER_OF_THREADS; i++)
{
    arrWorkMen[i] = new WorkMan() { 
        WorkStarted = true,
        InstanceID = startThreadNumber
    };

    arrWorkMen[i].BeginHandler += HandleTaskBegin;
    arrWorkMen[i].CompletedHandler += HandleTaskCompleted;

    // create a thread and attach to the object
    var st = new ThreadStart(arrWorkMen[i].doSomething);
    workThreads[i] = new Thread(st);

    startThreadNumber++;
}

for (var i = 0; i < NUMBER_OF_THREADS; i++)
{
    Thread.Sleep(2000);
    workThreads[i].Start();
}                

Thread.Start()

for (var i = 0; i < NUMBER_OF_THREADS; i++)
{
    arrWorkMen[i] = new WorkMan()
    {
        WorkStarted = true,
        InstanceID = startThreadNumber
    };

    arrWorkMen[i].BeginHandler += HandleTaskBegin;
    arrWorkMen[i].CompletedHandler += HandleTaskCompleted;

    startThreadNumber++;
}

for (var i = 0; i < NUMBER_OF_THREADS; i++)
{
    Thread.Sleep(2000);
     ThreadPool.QueueUserWorkItem(o => arrWorkMen[i].doSomething());
}        

ThreadPool.QueueUserWorkItem