任务 Async/Await ... 不明白

Question

我在 C# 中实现了这样的多任务处理：

using System;
using System.Threading;
using System.Threading.Tasks;

namespace TasksAsyncAwait
{
    class Program
    {
        static async Task Main(string[] args)
        {
            CancellationTokenSource cancellationTokenSource
                = new CancellationTokenSource();
            CancellationToken cancellationToken = cancellationTokenSource.Token;

            Task taskOne = Task.Factory.StartNew(() =>
            {
                Console.WriteLine("Task 1 start");
                for (int i = 0; i < 10; i++)
                {
                    cancellationToken.ThrowIfCancellationRequested();
                    Console.WriteLine($"T1: {i}");
                    cancellationToken.WaitHandle.WaitOne(500);
                }
                Console.WriteLine("Task 1 complete");
            }, cancellationToken);

            Task taskTwo = Task.Factory.StartNew(() =>
            {
                Console.WriteLine("Task 2 start");
                for (int i = 0; i < 5; i++)
                {
                    cancellationToken.ThrowIfCancellationRequested();
                    Console.WriteLine($"T2: {i}");
                    cancellationToken.WaitHandle.WaitOne(300);
                }
                Console.WriteLine("Task 2 complete");
            }, cancellationToken);

            Task.WaitAll(taskTwo, taskOne);
            Console.WriteLine("Program done.");
        }
    }
}

有人告诉我，尽管代码运行良好且易于理解，但它已经过时且已弃用，因此风格不佳，我需要重写此代码以遵循 async/await 方案。我读了很多关于如何使用 async/await 的文章，一些教程甚至涵盖了如何在控制台应用程序中使用它，但坦率地说，我一个字也不懂。请告诉我如何将我的代码转换为 async/await 样式。

Answer 1

你在这里：

using System;
using System.Threading;
using System.Threading.Tasks;

namespace TasksAsyncAwait
{
    class Program
    {
        static async Task Main()
        {
            var cancellationTokenSource = new CancellationTokenSource();
            var cancellationToken = cancellationTokenSource.Token;

            Task taskOne = Task.Run(async () =>
            {
                Console.WriteLine("Task 1 start");
                for (int i = 0; i < 10; i++)
                {
                    cancellationToken.ThrowIfCancellationRequested();
                    Console.WriteLine($"T1: {i}");
                    await Task.Delay(500, cancellationToken);
                }
                Console.WriteLine("Task 1 complete");
            }, cancellationToken);

            Task taskTwo = Task.Run(async () =>
            {
                Console.WriteLine("Task 2 start");
                for (int i = 0; i < 5; i++)
                {
                    cancellationToken.ThrowIfCancellationRequested();
                    Console.WriteLine($"T2: {i}");
                    await Task.Delay(300, cancellationToken);
                }
                Console.WriteLine("Task 2 complete");
            }, cancellationToken);

            await Task.WhenAll(taskOne, taskTwo);
            Console.WriteLine("Program done.");
        }
    }
}

无阻塞代码；异步等待无处不在！

任务 Async/Await ... 不明白

Tasks Async/Await ... don't get it

c#

multithreading

task-parallel-library

async-await

cancellation-token