C#任务（Task）

零、基本使用

using System.Threading.Tasks;
class Program
{
    static void Main()
    {
        Console.WriteLine("Begain Task");
        //启动一个Task
        Task task = Task.Run(() =>
        {
            Console.WriteLine("Task");
        });
        Console.WriteLine("EndTask");
        //等待Task完成
        task.Wait();
    }
}

一、启动Task

1、创建Task对象，Start启动Task

        Task task = new Task(() =>
        {
            Console.WriteLine("Task");
        });
        task.Start();

2、Task.Run()创建启动Task

        Task task = Task.Run(() =>
        {
            Console.WriteLine("Task");
        });

3、TaskFactory启动任务，与Task.Run()本质相同

        Task task = Task.Factory.StartNew(() =>
          {
              Console.WriteLine("Task");
          });

二、停止Task

使用CancellationTokenSource对象和CancellationToken来作为标记关闭Task

using System.Net;
using System.Threading.Tasks;
class Program
{
    static void Main()
    {
        Func<CancellationToken, Task> canceledTask = async (token) =>
        {
            while (true)
            {
                if (token.IsCancellationRequested)
                {
                    break;
                }
                Console.WriteLine("Hi");
                await Task.Delay(1000);
            }
            Console.WriteLine("Task Cancel");
        };

        CancellationTokenSource cancellationTokenSource = new CancellationTokenSource();
        CancellationToken cancellationToken = cancellationTokenSource.Token;

        Task task = canceledTask(cancellationToken);
        Console.ReadLine();
        cancellationTokenSource.Cancel();
        task.Wait();

    }
}

三、Task的延续