Castle Windsor typed app settings

Program.cs

[AppSettings("smtp:")]
public interface SmtpConfiguration
{
    string Name { get; set; }

    int Port { get; set; }

    string Username { get; set; }
}

public class AppSettingsAttribute : KeyPrefixAttribute, IDictionaryPropertyGetter, IPropertyDescriptorInitializer
{
    public AppSettingsAttribute(string keyPrefix)
        : base(keyPrefix)
    {
    }

    public object GetPropertyValue(IDictionaryAdapter dictionaryAdapter, string key, object storedValue,
        PropertyDescriptor property, bool ifExists)
    {
        if (storedValue == null && IsRequired(ifExists))
        {
            throw new ArgumentException("No valid value for '" + key + "' found");
        }

        return storedValue;
    }

    public void Initialize(PropertyDescriptor propertyDescriptor, object[] behaviors)
    {
        propertyDescriptor.Fetch = true;
    }

    private static bool IsRequired(bool ifExists)
    {
        return ifExists == false;
    }
}

public class Program
{
    public static void Main()
    {
        try
        {
            Run();
        }
        catch (Exception e)
        {
            Console.WriteLine(e);
        }
    }

    private static void Run()
    {
        var container = new WindsorContainer();
        container.Register(
            Component.For<SmtpConfiguration>()
                .UsingFactoryMethod(Create)
                .LifestyleSingleton());

        var smtp = container.Resolve<SmtpConfiguration>();

        Console.WriteLine("Name: {0}", smtp.Name);
        Console.WriteLine("Port: {0}", smtp.Port);
        Console.WriteLine("Username: " + smtp.Username);
    }

    private static SmtpConfiguration Create()
    {
        var factory = new DictionaryAdapterFactory();
        return factory.GetAdapter<SmtpConfiguration>(ConfigurationManager.AppSettings);
    }
}