使用 Task 替換 ThreadPool ，異步監測所有線程（任務）是否全部執行完畢

判斷線程池中線程是否全部執行完成的問題？

using Microsoft.VisualStudio.TestTools.UnitTesting;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;

namespace Ex.RulesTester.Threads
{
    /// <summary>
    /// 異步等待所有線程結束通知測試
    /// </summary>
    [TestClass]
    public class TaskAllCompleteTester
    {
        [TestMethod]
        public void TestTaskPoolStatus()
        {
            //運作異步多任務
            TaskTest.RunTask();
            var list = TaskTest.SuccessList;
            bool isAllComplete = false;
            //等待異步通知
            while (!isAllComplete)
            {
                isAllComplete = TaskTest.IsAllComplete;
                list = TaskTest.SuccessList;
            }

            Assert.IsTrue(true);
        }
        /// <summary>
        /// 對于 task 多任務執行的封裝
        /// </summary>
        private class TaskTest
        {
            private static object m_lock = new object();
            public static List<string> SuccessList = new List<string>();
            private static string msg = "";
            public static bool IsFinish = false;
            public static List<Task> TaskList = new List<Task>();
            static bool isAllComplete = false;
            /// <summary>
            /// 标記所有任務是否全部執行完畢
            /// </summary>
            public static bool IsAllComplete
            {
                get { return isAllComplete; }
            }

            private TaskTest()
            {

            }

            public static void RunTask()
            {
                //運作5個任務
                for (int i = 1; i <= 5; i++)
                {
                    var task = Task.Factory.StartNew(DoTask, i);
                    TaskList.Add(task);
                }
                //異步等待所有任務執行完畢
                Task.Factory.StartNew(x =>
                {
                    Task.WaitAll(TaskList.ToArray());
                    //标記所有任務運作完成
                    isAllComplete = true;
                }, null);
            }
            private static void DoTask(object par)
            {
                Thread.Sleep(int.Parse(par.ToString()) * 1000);
                lock (m_lock)
                {
                    SuccessList.Add("Has Completed T" + par.ToString());
                }
            }

        }
    }
}      

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