EmitLogTopic.cs

using System;
using System.Linq;
using RabbitMQ.Client;
using System.Text;

class EmitLogTopic
{
    public static void Main(string[] args)
    {
        var factory = new ConnectionFactory() { HostName = "localhost" };
        using (var connection = factory.CreateConnection())
        {
            using (var channel = connection.CreateModel())
            {
                channel.ExchangeDeclare("topic_logs", "topic");

                var routingKey = (args.Length > 0) ? args[0] : "anonymous.info";
                var message = (args.Length > 1) ? string.Join(" ", args.Skip(1)
                                                                                  .ToArray())
                                                               : "Hello World!";
                var body = Encoding.UTF8.GetBytes(message);
                channel.BasicPublish("topic_logs", routingKey, null, body);
                Console.WriteLine(" [x] Sent '{0}':'{1}'", routingKey, message);
            }
        }
    }
}