increment a count value outside parallel.foreach scope

Question

How can I increment an integer value outside the scope of a parallel.foreach loop? What\'s is the lightest way to synchronize access to objects outside parallel loops?

Answer 1

Use Interlocked.Increment method in this way.

int count = 0;
Parallel.ForEach(users, (u) =>
{
    var currentCount = Interlocked.Increment(ref count);
    Log(String.Format("Step {0} of {1}", currentCount, users.Count));
});