private static object _lock = new object();
　　　　 public static void TaskMethond(object item)
        {lock (_lock)
            {
                Console.WriteLine(item?.ToString());
                Console.WriteLine($"任務(wù)Id：{Task.CurrentId?.ToString() ?? "沒有任務(wù)運(yùn)行"}\t 線程Id：{Thread.CurrentThread.ManagedThreadId}");
                Console.WriteLine($"是否是線程池中的線程：{Thread.CurrentThread.IsThreadPoolThread}");
                Console.WriteLine($"是否是后臺(tái)線程：{Thread.CurrentThread.IsBackground}");
                Console.WriteLine();
            }
        }#region 任務(wù)創(chuàng)建public static void TaskCreateRun()
        {var taskFactory = new TaskFactory();var task1 = taskFactory.StartNew(TaskMethond, "使用實(shí)例化TaskFactory");var task2 = Task.Factory.StartNew(TaskMethond, "使用Task靜態(tài)調(diào)用Factory");var task3 = new Task(TaskMethond, "使用Task構(gòu)造函數(shù)實(shí)例化");
            task3.Start();var task4 = Task.Run(() => TaskMethond("使用Task.Run"));

        }#endregion

        #region 單獨(dú)線程運(yùn)行任務(wù)public static void OnlyThreadRun()
        {var task1 = new Task(TaskMethond, "單獨(dú)線程運(yùn)行任務(wù)", TaskCreationOptions.LongRunning);
            task1.Start();
        }#endregion

        #region 同步任務(wù)public static void TaskRunSynchronoushly()
        {
            TaskMethond("主線程調(diào)用");var task1 = new Task(TaskMethond, "任務(wù)同步調(diào)用");
            task1.RunSynchronously();
        }#endregion

        #region 連續(xù)任務(wù)public static void TaskOne()
        {
            Console.WriteLine($"任務(wù){(diào)Task.CurrentId},方法名：{System.Reflection.MethodBase.GetCurrentMethod().Name }啟動(dòng)");
            Task.Delay(1000).Wait();
            Console.WriteLine($"任務(wù){(diào)Task.CurrentId},方法名：{System.Reflection.MethodBase.GetCurrentMethod().Name }結(jié)束");
        }public static void TaskTwo(Task task)
        {
            Console.WriteLine($"任務(wù){(diào)task.Id}以及結(jié)束了");
            Console.WriteLine($"現(xiàn)在開始的 任務(wù)是任務(wù){(diào)Task.CurrentId},方法名稱：{System.Reflection.MethodBase.GetCurrentMethod().Name  }  ");
            Console.WriteLine($"任務(wù)處理");
            Task.Delay(1000).Wait();
        }public static void TaskThree(Task task)
        {
            Console.WriteLine($"任務(wù){(diào)task.Id}以及結(jié)束了");
            Console.WriteLine($"現(xiàn)在開始的 任務(wù)是任務(wù){(diào)Task.CurrentId}.方法名稱：{System.Reflection.MethodBase.GetCurrentMethod().Name } ");
            Console.WriteLine($"任務(wù)處理");
            Task.Delay(1000).Wait();
        }public static void ContinueTask()
        {
            Task task1 = new Task(TaskOne);
            Task task2 = task1.ContinueWith(TaskTwo, TaskContinuationOptions.OnlyOnRanToCompletion);//已完成情況下繼續(xù)任務(wù)Task task3 = task1.ContinueWith(TaskThree, TaskContinuationOptions.OnlyOnFaulted);//出現(xiàn)未處理異常情況下繼續(xù)任務(wù)            task1.Start();
        }#endregion

        #region 任務(wù)的層次結(jié)構(gòu)——父子層次結(jié)構(gòu)public static void ChildTask()
        {
            Console.WriteLine("當(dāng)前運(yùn)行的子任務(wù)，開啟");
            Task.Delay(5000).Wait();
            Console.WriteLine("子任務(wù)運(yùn)行結(jié)束");
        }public static void ParentTask()
        {
            Console.WriteLine("父級(jí)任務(wù)開啟");var child = new Task(ChildTask);
            child.Start();
            Task.Delay(1000).Wait();
            Console.WriteLine("父級(jí)任務(wù)結(jié)束");
        }public static void ParentAndChildTask()
        {var parent = new Task(ParentTask);
            parent.Start();
            Task.Delay(2000).Wait();
            Console.WriteLine($"父級(jí)任務(wù)的狀態(tài) :{parent.Status}");
            Task.Delay(4000).Wait();
            Console.WriteLine($"父級(jí)任務(wù)的狀態(tài) ：{parent.Status}");
        }#endregion

        #region 等待任務(wù)private static DateTime _time;private static List<string> _data;public static async ValueTask<List<string>> GetStringDicAsync()
        {if (_time >= DateTime.Now.AddSeconds(-5))
            {return await new ValueTask<List<string>>(_data);
            }else{
                (_data, _time) = await GetData();return _data; 
            }
        }public static Task<(List<string> data, DateTime time)> GetData() => 
            Task.FromResult(
                (Enumerable.Range(0, 10).Select(x => $"itemString{x}").ToList(), DateTime.Now));public static async Task<List<string>> GetStringList()
        {
            (_data, _time) = await GetData();return _data;
        }#endregion

        static async Task  Main(string[] args)
        { 
            Stopwatch stopwatch = new Stopwatch();
            stopwatch.Start();
            Console.WriteLine("ValueTask開始");for (int i = 0; i < 100000; i++)
            {               var itemList= await GetStringDicAsync(); 
            }
            Console.WriteLine("ValueTask結(jié)束");
            Console.WriteLine($"ValueTask耗時(shí)：{stopwatch.ElapsedMilliseconds}");

            Console.WriteLine();
            Console.WriteLine();

            stopwatch.Restart();
            Console.WriteLine("Task開始");for (int i = 0; i < 100000; i++)
            {var itemList = await GetStringList(); 
            }
            Console.WriteLine("Task結(jié)束");
            Console.WriteLine($"Task耗時(shí)：{stopwatch.ElapsedMilliseconds}");
            Console.ReadLine();
        }