我想用redis来实现分布式锁。我正在为此使用redlock.net nuget包。但是线程能够获得锁，甚至另一个线程已经获得了锁。
下面是示例代码：

public void Demo(RedLockFactory redLockFactory)
        {
            Parallel.For(0, 5, x =>
            {
                TimeSpan expiry = TimeSpan.FromSeconds(30);
                var wait = TimeSpan.FromSeconds(10);
                var retry = TimeSpan.FromSeconds(1);

                string user = $"User:{x}";
                using (var redLock = redLockFactory.CreateLock(resource, expiry, wait, retry))
                {

                    // make sure we got the lock
                    if (redLock.IsAcquired)
                    {
                        Console.WriteLine($"{user} acquired lock at {DateTimeOffset.Now.ToString("dd-MM-yyyy HH:mm:ss")}.");
                    }
                    else
                    {
                        Console.WriteLine($"{user} didn't get the lock.");
                    }
                }
            });
        }

这是我演示的输出

User:4 acquired lock at 06-10-2020 09:24:34.
User:2 acquired lock at 06-10-2020 09:24:34.
User:1 acquired lock at 06-10-2020 09:24:34.
User:0 acquired lock at 06-10-2020 09:24:35.
User:3 acquired lock at 06-10-2020 09:24:35.

如您所见，每个线程都能够获得锁，这是不应该发生的。
一旦获得了锁，那么其他线程就不能获得锁。