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( exchange: "topic_logs", type: "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( exchange: "topic_logs", routingKey: routingKey, basicProperties: null, body: body );
            Console.WriteLine( " [x] Sent '{0}':'{1}'", routingKey, message );
        }
    }
}