关于 CancelToken 的学习笔记

最简单的例子：

    private static async Task Main(string[] args)
        {
            CancellationTokenSource tokenSource = new CancellationTokenSource();
            CancellationToken cancellationToken = tokenSource.Token;
            //打印被取消
            cancellationToken.Register(() => System.Console.WriteLine("被取消了."));
            //模拟传递的场景
            _ = Task.Run(async () => {
                //while (!cancellationToken.IsCancellationRequested)
                //{
                    System.Console.WriteLine("一直在执行...");
                    await Task.Delay(1000, cancellationToken);
                //}
            });
            //5s之后取消
            //tokenSource.CancelAfter(5000);
            tokenSource.Cancel();
            Console.ReadKey();
        }