Parallel.For如何获取正在循环中使用的线程数？

using System;
using System.Threading;
using System.Threading.Tasks;

class Program
{
    static void Main()
    {
        int threadCount = 0;

        Parallel.For(0, 10, (i) =>
        {
            // 获取当前线程的唯一标识符
            int threadId = Thread.CurrentThread.ManagedThreadId;

            // 统计正在循环中使用的线程数
            Interlocked.Increment(ref threadCount);

            // 执行循环体操作
            Console.WriteLine("Thread {0} is processing iteration {1}", threadId, i);

            // 减少正在循环中使用的线程数
            Interlocked.Decrement(ref threadCount);
        });

        Console.WriteLine("Total threads used: {0}", threadCount);
    }
}