C# Task 学习记录

        在 C# 中，Task是用于表示异步操作的核心类型之一，提供了一种简单、高效的方式来处理异步操作，使得开发者可以轻松地编写非阻塞的代码。下面是C# Task例子，包含取消、超时、延续任务、获取任务执行情况：

using System;
using System.Threading;
using System.Threading.Tasks;public class Program
{private static CancellationTokenSource cancellationTokenSource = new CancellationTokenSource();public static void Main(string[] args){asyncStaticFunction();Console.Read();}public async static void asyncStaticFunction(){Task<string> task;string result = "被中断";//cancellationTokenSource.CancelAfter(10);//设置超时，会在10毫秒取消任务task = testTask("Hello world", cancellationTokenSource.Token);task.ContinueWith(t =>{Console.WriteLine(t.Status.ToString());}, TaskContinuationOptions.ExecuteSynchronously);//同步执行延续任务try{result = await task;}catch (OperationCanceledException ex){Console.WriteLine("testTask发生错误：被取消了");}catch (Exception ex){Console.WriteLine($"testTask发生错误：{ex.Message}");}if (task.IsCompleted)//不管是出错还是取消，IsCompleted都会是true{Console.WriteLine("testTask完成了");}if (task.IsCanceled){Console.WriteLine("testTask被取消了");}if (task.IsFaulted){Console.WriteLine("testTask出错了");}Console.WriteLine($"testTask返回值:{result}");}public async static Task<string> testTask(string message, CancellationToken cancellationToken)//不需要返回值就直接Task类型{for (int time = 0; time < 10; time++){cancellationToken.ThrowIfCancellationRequested();Console.WriteLine($"testTask{time}:{message}");await Task.Delay(100);if (time == 5 && false)//为true会结束任务，会进入asyncStaticFunction的catch (Exception ex) ， Console.WriteLine($"testTask返回值:{result}");输出被中断{throw new Exception("testTask错误");}if (time == 5 && true)//为true会结束任务，进入asyncStaticFunction的catch (OperationCanceledException ex)， Console.WriteLine($"testTask返回值:{result}");输出被中断{cancellationTokenSource.Cancel();}}return "testTask完成";}
}