EmitLogDirect.cs

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

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