ReceiveLogsDirect.cs

using System;
using RabbitMQ.Client;
using RabbitMQ.Client.Events;
using System.Text;

class ReceiveLogsDirect
{
    public static void Main(string[] args)
    {
        var factory = new ConnectionFactory() { HostName = "localhost" };
        using (var connection = factory.CreateConnection())
        {
            using (var channel = connection.CreateModel())
            {
                channel.ExchangeDeclare("direct_logs", "direct");
                var queueName = channel.QueueDeclare();

                if (args.Length < 1)
                {
                    Console.Error.WriteLine("Usage: {0} [info] [warning] [error]",
                                            Environment.GetCommandLineArgs()[0]);
                    Environment.ExitCode = 1;
                    return;
                }

                foreach (var severity in args)
                {
                    channel.QueueBind(queueName, "direct_logs", severity);
                }

                Console.WriteLine(" [*] Waiting for messages. " +
                                  "To exit press CTRL+C");

                var consumer = new QueueingBasicConsumer(channel);
                channel.BasicConsume(queueName, true, consumer);

                while (true)
                {
                    var ea = (BasicDeliverEventArgs)consumer.Queue.Dequeue();

                    var body = ea.Body;
                    var message = Encoding.UTF8.GetString(body);
                    var routingKey = ea.RoutingKey;
                    Console.WriteLine(" [x] Received '{0}':'{1}'",
                                      routingKey, message);
                }
            }
        }
    }
}