Add and configure StructureMap in an ASP.NET MVC 5 Project

DependencyConfig.cs

public class DependencyConfig
{
    public static void RegisterDependencies()
    {
        var container = new Container();

        container.Configure(cfg => cfg.Scan(scan =>
        {
            scan.TheCallingAssembly();
            scan.WithDefaultConventions();
        }));

        DependencyResolver.SetResolver(new StructureMapDependencyResolver(container));
    }
}

Global.asax.cs

DependencyConfig.RegisterDependencies();

StructureMapDependencyResolver.cs

public class StructureMapDependencyResolver : IDependencyResolver
{
    private readonly IContainer _container;

    public StructureMapDependencyResolver(IContainer container)
    {
        _container = container;
    }

    public object GetService(Type serviceType)
    {
        if (serviceType.IsAbstract || serviceType.IsInterface)
        {
            // as the requested type is interface or abstract, tries to instance, if can't returns null
            return _container.TryGetInstance(serviceType);
        }

        // instance a concrete type
        return _container.GetInstance(serviceType);
    }

    public IEnumerable<object> GetServices(Type serviceType)
    {
        return _container.GetAllInstances<object>().Where(s => s.GetType() == serviceType);
    }
}