C# sleep和Dely的区别

1、区别

Thread.Sleep()  阻塞主线程

Task.Dely()  等待线程，不阻塞主线程，与ContinueWith()一起使用，时间到了，调用ContinueWith()里面的方法

2、区别代码

{   
    Stopwatch stopwatch = new Stopwatch();
    Task.Run(() => {
        stopwatch.Start();
        // 阻塞主线程
        Thread.Sleep(1000 * 3);
        stopwatch.Stop();
        Console.WriteLine($"sleep结束，线程：{Thread.CurrentThread.ManagedThreadId.ToString("00")}，耗时：{stopwatch.ElapsedMilliseconds}");
    });
}
{   
    Stopwatch stopwatch = new Stopwatch();
    Task.Run(() => {
        stopwatch.Start();
        // 等待线程，不阻塞主线程
        Task.Delay(1000 * 3);
        stopwatch.Stop();
        Console.WriteLine($"dely结束，线程：{Thread.CurrentThread.ManagedThreadId.ToString("00")}，耗时：{stopwatch.ElapsedMilliseconds}");
    });
}

3、使用Dely

Stopwatch stopwatch = new Stopwatch();
Task.Run(() => {
    stopwatch.Start();
    // 不阻塞主线程，等待线程，等待完成后，执行 ContinueWith 里面的方法
    Task.Delay(1000 * 3).ContinueWith(_ =>{
        stopwatch.Stop();
        Console.WriteLine($"Dely结束，当前线程：{Thread.CurrentThread.ManagedThreadId.ToString("00")}，执行时间：{stopwatch.ElapsedMilliseconds}");
    });
});