Introduction to AutoFac with a simple example (Autofac Tutorial)

Autofac is an Inversion of Control (IOC) container that was introduced in late 2007. Autofac is meant to deal with Dependency Injection.

In the console application example below, the class BootStrap uses Autofac to decide which implementation of the interface IGetdata to use.

To follow this example you need to add references to the Autofac and Autofac.Configuration dlls, which you can get from http://code.google.com/p/autofac/. I used version 2.6.3.862 for my example.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Autofac;
 
namespace AutofacExample
{
 
 
    class Program
    {
        static void Main()
        {           
            using (var container = BootStrap.Components())
            {
                var messenger = container.Resolve<IGetData>();
                messenger.GetMessage();//Displays Hi from XML
                    
            }
        }
    }
 
 
    public interface IGetData
    {
        void GetMessage();
    }
 
 
    public class GetMessageFromDatabase : IGetData
    {
        public void GetMessage()
        {
             
            Console.WriteLine("Hi from database");
        }
    }
 
 
    public class GetMessageFromXML : IGetData
    {
        public void GetMessage()
        {
            Console.WriteLine("Hi from XML");
        }
    }
 
    public class GetMessageFromTextFile : IGetData
    {
        public void GetMessage()
        {
            Console.WriteLine("Hi from Text File");
        }
    }
 
    public class BootStrap
    {
        public static IContainer Components()
        {
            var builder = new ContainerBuilder();
            builder.RegisterType<GetMessageFromXML>().As<IGetData>();
 
            return builder.Build();
        } 
 
    } 
 
}

Check this article (Autofac with MVC) out for a little bit more 

advanced example on Autofac