C#怎么使用Task.ContinueWith组合任务

这篇文章主要讲解了“C#怎么使用Task.ContinueWith组合任务”，文中的讲解内容简单清晰，易于学习与理解，下面请大家跟着小编的思路慢慢深入，一起来研究和学习“C#怎么使用Task.ContinueWith组合任务”吧！

代码案例

简单Demo

代码：

        public static void Main()        {            //创建一个任务            Task<int> task = new Task<int>(() =>            {                int sum = 0;                Console.WriteLine("使用Task異步執行操作.");                for (int i = 0; i <= 100; i++)                {                    sum += i;                }                return sum;            });                        //启动任务,并安排到当前任务队列线程中执行任务(System.Threading.Tasks.TaskScheduler)            task.Start();            Console.WriteLine("主線程執行其他程序.");                       //任务完成时执行处理。            Task cwt = task.ContinueWith(t =>            {                Console.WriteLine("任務完成後的結果是：{0}", t.Result.ToString());            });            task.Wait();            cwt.Wait();            Console.ReadLine();            Console.ReadKey();        }

结果：

任务的串行

代码：

        static void Main(string[] args)        {            ConcurrentStack<int> stack = new ConcurrentStack<int>();            //t1先串行            var t1 = Task.Factory.StartNew(() =>            {                //入棧                stack.Push(1);                stack.Push(2);            });            //t2,t3并行执行            var t2 = t1.ContinueWith(t =>            {                int result;                //出棧                stack.TryPop(out result);                Console.WriteLine("Task t2 result={0},Thread id {1}", result, Thread.CurrentThread.ManagedThreadId);            });            //t2,t3并行执行            var t3 = t1.ContinueWith(t =>            {                int result;                //出棧                stack.TryPop(out result);                Console.WriteLine("Task t3 result={0},Thread id {1}", result, Thread.CurrentThread.ManagedThreadId);            });            //等待t2和t3执行完            Task.WaitAll(t2, t3);            //t7串行执行            var t4 = Task.Factory.StartNew(() =>            {                Console.WriteLine("當前的集合數目：{0},Thread id {1}", stack.Count, Thread.CurrentThread.ManagedThreadId);            });            t4.Wait();            Console.ReadKey();        }

结果：

子任务

代码：

        public static void Main()        {            Task<string[]> parent = new Task<string[]>(state =>            {                Console.WriteLine(state);                string[] result = new string[2];                //创建并启动子任务                new Task(() => { result[0] = "我是子任務1。"; }, TaskCreationOptions.AttachedToParent).Start();                new Task(() => { result[1] = "我是子任務2。"; }, TaskCreationOptions.AttachedToParent).Start();                return result;            }, "我是父任務，並在處理過程中創建多個子任務，所有的子任務完成以後我才會開始執行。");                       //任务处理完成后执行的操作            parent.ContinueWith(t =>            {                Array.ForEach(t.Result, r => Console.WriteLine(r));            });            //启动父任务            parent.Start();            //等待任务结束 Wait只能等待父线程结束,没办法等到父线程的ContinueWith结束            //parent.Wait();            Console.ReadLine();        }

结果：

动态并行

代码：

    class node    {        public Node Left { get; set; }        public Node Right { get; set; }        public string Text { get; set; }    }    class Program    {        static Node GetNode()        {            Node root = new Node            {                Left = new Node                {                    Left = new Node                    {                        Text = "L-L"                    },                    Right = new Node                    {                        Text = "L-R"                    },                    Text = "L"                },                Right = new Node                {                    Left = new Node                    {                        Text = "R-L"                    },                    Right = new Node                    {                        Text = "R-R"                    },                    Text = "R"                },                Text = "Root"            };            return root;        }        static void Main(string[] args)        {            Node root = GetNode();            DisplayTree(root);        }        static void DisplayTree(Node root)        {            var task = Task.Factory.StartNew(() => DisplayNode(root),                                            CancellationToken.None,                                            TaskCreationOptions.None,                                            TaskScheduler.Default);            task.Wait();        }        static void DisplayNode(Node current)        {            if (current.Left != null)                Task.Factory.StartNew(() => DisplayNode(current.Left),                                            CancellationToken.None,                                            TaskCreationOptions.AttachedToParent,                                            TaskScheduler.Default);            if (current.Right != null)                Task.Factory.StartNew(() => DisplayNode(current.Right),                                            CancellationToken.None,                                            TaskCreationOptions.AttachedToParent,                                            TaskScheduler.Default);            Console.WriteLine("當前節點值:{0};處理的Thread ID ={1}", current.Text, Thread.CurrentThread.ManagedThreadId);        }    }

结果：

感谢各位的阅读，以上就是“C#怎么使用Task.ContinueWith组合任务”的内容了，经过本文的学习后，相信大家对C#怎么使用Task.ContinueWith组合任务这一问题有了更深刻的体会，具体使用情况还需要大家实践验证。这里是编程网，小编将为大家推送更多相关知识点的文章，欢迎关注！