在C#中使用多线程加速循环(问题)

using System.Threading.Tasks;

Parallel.For(0, 10000, i => Task.Run(() => Console.WriteLine(i)));

ThreadPool.QueueUserWorkItem(delegate { Console.WriteLine(0); });
ThreadPool.QueueUserWorkItem(delegate { Console.WriteLine(1); });
ThreadPool.QueueUserWorkItem(delegate { Console.WriteLine(2); });

ThreadPool.GetQueueWorkItem(() => { Console.WriteLine(0); });
ThreadPool.GetQueueWorkItem(() => { Console.WriteLine(1); });
ThreadPool.GetQueueWorkItem(() => { Console.WriteLine(2); });