C＃中的线程处理

Question

I have the following code.. When i am executing this code, all the 5 thread windows are displaying at the same time. But I want to execute a single thread with some value in each iteration. More than two threads should not be executed at a time.. The second thread(key=1) should start only after the completion of the first thread(key=0), and third thread(key=2) only after the completion of the second thread, and so on. Please help.. How can deal with this problem.

for (long key = 0; key < 5; key++)
{                                                      
                    var processingThread = new Thread(() => DoDataSetup(key));                         
                    _progress = new ProgressReport(processingThread);
                    _progress.Show();
                    _progress.FormClosed += delegate(object delSender, FormClosedEventArgs args)
                    {
                        this.Enabled = true;
                    };

                    this.Enable    d = false;

                    processingThread.Start();                                                          
                }

Answer 1

First of all it is better to use ThreadPool for Task creation, but I suggest you to create threads with use of Task.Run(...) . For allowing to enter only a limited number of threads you could use the Semaphore class, or you use the BatchBlock of the TPL-API

//with semaphore
var semaphore = new Semaphore(0,2);
for(long key = 0; key < 5; key++)
{
    semaphore.WaitOne();

    ProcessWorking(key);

    semaphore.Release();
}

public void ProcessWorking(long key)
{
    var processingThread = new Thread(() => DoDataSetup(key));                         
    _progress = new ProgressReport(processingThread);
    _progress.Show();
    _progress.FormClosed += delegate(object delSender, FormClosedEventArgs args)
    {
        this.Enabled = true;
    };

    this.Enabled = false;
    processingThread.Start();
}