编辑代码

using System;
using System.Threading;

class Program
{
    public static void Main(string[] args)
    {
        var index = 1;
         var _connectBETimer = new Timer(obj =>
                {
                    Console.WriteLine("timer " + (index++));
                }, null, 1, 1000);
                
        Console.WriteLine("Hello, World");
    }
}