C# Online Compiler | .NET Fiddle

<no name> by Anonymous

using System;
using System.Threading.Tasks;
using System.Threading;
					
public class Program
{
	public static void Main()
	{
		Test().Wait();
	}
	
	public static async Task Test(){
		var o = new object();
		bool taken = false;
		try{
			Monitor.Enter(o, ref taken);
			Console.WriteLine(Thread.CurrentThread.ManagedThreadId);
			await Task.Delay(100);
			Console.WriteLine(Thread.CurrentThread.ManagedThreadId);
		}finally{
			if(taken){
				Monitor.Exit(o);
			}
		}
	}
}

​x
 
using System;
using System.Threading.Tasks;
using System.Threading;
                    
public class Program
{
    public static void Main()
    {
        Test().Wait();
    }
    
    public static async Task Test(){
        var o = new object();
        bool taken = false;
        try{
            Monitor.Enter(o, ref taken);
            Console.WriteLine(Thread.CurrentThread.ManagedThreadId);
            await Task.Delay(100);
            Console.WriteLine(Thread.CurrentThread.ManagedThreadId);
        }finally{
            if(taken){
                Monitor.Exit(o);
            }
        }
    }
}
​

Posts criados na "base de dados":
Post: 86b70268-984c-4dea-9de9-3b96cab9a6ba
Post: 56bc564a-53c9-454f-8243-754727447073
Post: af229a36-04e1-40e2-a00a-56de361fd01b
Post: dc6095bd-dc2a-46e0-84ee-d73acc930ae9
Post: b32785a6-aaf2-424f-92a1-4f8ab9569176
Post: 88a81287-4247-4b12-a992-5f27583466a8
Post: 36b1b303-647b-4dcf-aca9-fb9ff3846911
Post: 6607903e-c6dc-4c5c-9ff0-3659686b8a28
Post: d0bd3f75-0ba2-41ad-8cb6-e0e33a426577
Post: 40d40775-af9d-4a4c-b757-fe32eb34439e

Ids selecionados:
Id: 88a81287-4247-4b12-a992-5f27583466a8
Id: 86b70268-984c-4dea-9de9-3b96cab9a6ba
Id: 6607903e-c6dc-4c5c-9ff0-3659686b8a28

Resultado final:
Post: 88a81287-4247-4b12-a992-5f27583466a8
Post: 86b70268-984c-4dea-9de9-3b96cab9a6ba
Post: 6607903e-c6dc-4c5c-9ff0-3659686b8a28

Last Run:	11:03:07 pm
Compile:	1.068s
Execute:	0s
Memory:	20kb
CPU:	0.203s

View IL Code