将ReaderWriterLockSlim UpgradeableReadLock降级为简单的ReadLock

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

class Program
{
    static ReaderWriterLockSlim _lock = new ReaderWriterLockSlim();

    static void Main(string[] args)
    {
        Task.Run(() => SimulateUpgradeableReadLock());
        Task.Run(() => SimulateReadLock());

        Console.ReadLine();
    }

    static void SimulateUpgradeableReadLock()
    {
        _lock.EnterUpgradeableReadLock();
        Console.WriteLine("UpgradeableReadLock acquired");

        // Perform some operations

        _lock.DowngradeToReadLock();
        Console.WriteLine("Downgraded to ReadLock");

        // Perform some more operations

        _lock.ExitReadLock();
        Console.WriteLine("ReadLock released");
    }

    static void SimulateReadLock()
    {
        _lock.EnterReadLock();
        Console.WriteLine("ReadLock acquired");

        // Perform some operations

        _lock.ExitReadLock();
        Console.WriteLine("ReadLock released");
    }
}