ValidationBehavior<T>

IModelTypeCoordinator.cs

public interface IModelTypeCoordinator
{
	IValidationModel FindGetFor(Type postType);
}

IValidationModel.cs

public interface IValidationModel
{
	ValidationResult ValidationResult { get; set; }
}

ModelTypeCoordinator.cs

public class ModelTypeCoordinator : IModelTypeCoordinator
{
	private readonly IChainResolver _resolver;
	
	public ModelTypeCoordinator(IChainResolver resolver)
	{
		_resolver = resolver;
	}
	
	public IValidationModel FindGetFor(Type postType)
	{
		var postChain = chain.FindUniqueByInputType(typeof(T));
		var getChain = chain.Find(achain.FirstCall().HandlerType, achain.FirstCall().HandlerType.GetMethod("Get"));
		return (IValidationModel) Activator.CreateInstance(getChain.InputType());
	}
}

ValidationBehavior.cs

public class ValidationBehavior<T> : BasicBehavior where T : class
{
	IFubuRequest request;
	IPartialFactory _factory;
	IModelTypeCoordinator _coordinator;

	public ValidationBehavior(IFubuRequest request, IPartialFactory factory, IModelTypeCoordinator coordinator) 
		: base(PartialBehavior.Executes)
	{
		this.request = request;
		this._factory = factory;
		this._coordinator = coordinator;
	}

	protected override DoNext performInvoke()
	{
		var model = request.Get<T>();
		// validate and return DoNext.Continue if successful
		// e.g., var result = _validationProvider.Validate(model);

		var target = _coordinator.FindGetFor(model.GetType());
		// set ValidationResult property (e.g., target.ValidationResult = result;)
		_factory
			.BuildPartial(targetType.GetType())
			.InvokePartial();

		return DoNext.Stop;
	}
}