C# 中的协程

C# 中的协程是一种在异步编程中非常有用的技术。它可以使代码的执行在遇到阻塞操作时暂停，然后在阻塞操作完成后恢复执行。这种方式使得异步编程更加简洁和易于理解。下面将介绍 C# 中的协程，并通过一个案例代码来演示其用法。

csharp
using System;
using System.Collections;
using System.Threading.Tasks;
public class CoroutineExample
{
    public static async Task Main(string[] args)
    {
        await CoroutineRunner();
    }
    public static async Task CoroutineRunner()
    {
        await CoroutineManager.Instance.RunCoroutine(CountDownCoroutine());
    }
    public static async Task CountDownCoroutine()
    {
        for (int i = 5; i >= 0; i--)
        {
            Console.WriteLine($"Countdown: {i}");
            await Task.Delay(1000);
        }
        Console.WriteLine("Countdown finished!");
    }
}
public class CoroutineManager
{
    private static CoroutineManager instance;
    public static CoroutineManager Instance
    {
        get
        {
            if (instance == null)
            {
                instance = new CoroutineManager();
            }
            return instance;
        }
    }
    private CoroutineManager()
    {
    }
    public async Task RunCoroutine(IEnumerator coroutine)
    {
        while (coroutine.MoveNext())
        {
            if (coroutine.Current is Task task)
            {
                await task;
            }
        }
    }
}