Validation Rules in Fubu

IValidationQuery.cs

public interface IValidationQuery
{
    IEnumerable<IValidationRule> RulesFor(object target);
    IEnumerable<IValidationRule> RulesFor(Type targetType);
    T GetRule<T>(Accessor accessor) where T : class, IValidationRule;
    T GetStrategy<T>(Accessor accessor) where T : class, IFieldValidationStrategy;
    void ForRule<T>(Accessor accessor, Action<T, Accessor> action) where T : class, IValidationRule;
    void ForStrategy<T>(Accessor accessor, Action<T, Accessor> action) where T : class, IFieldValidationStrategy;
    bool HasRule<T>(Accessor accessor) where T : class, IValidationRule;
    bool HasStrategy<T>(Accessor accessor) where T : class, IFieldValidationStrategy;
}

IValidationRule.cs

public interface IValidationRule
{
    bool AppliesTo(Accessor accessor);
    void Validate(object target, Notification notification);
}

IValidationSource.cs

public interface IValidationSource
{
	IEnumerable<IValidationRule> RulesFor(Type type);
}

MyCustomValidationRegistry.cs

public class MyCustomValidationRegistry : ValidationRegistry
{
	public MyCustomValidationRegistry()
	{
		Rules
		    .If(accessor => accessor.Name.Contains("Email"))
		    .ApplyStrategy<MyCustomEmailStrategy>();
	}
}