使用TaskScheduler 调度器 实现跨线程的控件访问

        //任务调度器
        TaskScheduler UIscheduler = null;
        public Form1()
        {
            //获取任务调度器
            UIscheduler = TaskScheduler.FromCurrentSynchronizationContext();
            InitializeComponent();
        }

        private void btnTaskScheduler_Click(object sender, EventArgs e)
        {
            System.Threading.CancellationTokenSource cts = new System.Threading.CancellationTokenSource();
            //启动一个任务线程
            Task<int> t = Task.Run(() =>Sum(100));
            //使用UIscheduler 调度器 实现跨线程的控件访问
            t.ContinueWith(task => txtRes.Text = t.Result.ToString(), cts.Token,TaskContinuationOptions.OnlyOnRanToCompletion,UIscheduler);
            t.ContinueWith(task => txtRes.Text = "Error",System.Threading.CancellationToken.None, TaskContinuationOptions.OnlyOnFaulted,UIscheduler);
        }
        private int Sum(int num)
        {
            int res = 0;
            for (int i = 0; i <= num; i++)
            {
                checked { res += i; }
                //res += i;
            }
            return res;
        }