multithreading re-entrancy issue

Question

I\'m trying to spawn different threads for some processing. I use the for loop index for some logic inside each thread.
How can I get the different threads to p

Answer 1

You are 'capturing the loop variable'. The fact that j is used inside the lambda means the compiler will treat it differently (in essence, it will be boxed) and all thread will use the same shared variable.

The short fix:

 for (int j = 1; j <= 5; j++)
 {
     int jCopy = j;

     tasks1.Add(Task.Factory.StartNew(() =>
      {
          Console.WriteLine(jCopy);
      }, new CancellationToken(), TaskCreationOptions.LongRunning, TaskScheduler.Default)

     );
 }