BO parameters validation

public class ValidateBOMethodRunnerExecute : BOMethodRunnerExecute
{
public ValidateBOMethodRunnerExecute(XafApplication application)
: base(application)
{
}public override void Run(BusinessOperationAction createResultViewParameters, IBusinessOperation businessOperation,
ShowViewParameters showViewParameters)
{
base.Run(createResultViewParameters, businessOperation, showViewParameters);if (showViewParameters.CreatedView != null)
{
var dialogController = showViewParameters.Controllers.OfType().FirstOrDefault();
if (dialogController == null)
{
dialogController = Application.CreateController();
showViewParameters.Controllers.Add(dialogController);
}dialogController.Accepting += (sender, args) =>
{
var controller = sender as DialogController;
RuleSetValidationResult result = Validator.RuleSet.ValidateTarget(this.Application.CreateObjectSpace(), controller.Frame.View.CurrentObject, ContextIdentifier.Save);
if (result.ValidationOutcome > ValidationOutcome.Information)
args.Cancel = true;
else
MyRunOperationCore(createResultViewParameters, businessOperation, args.ShowViewParameters);
};
}
}

public class CustomizeBusinessOperationsController : ViewController
{
private BOExecViewController _boExecViewController;protected override void OnActivated()
{
base.OnActivated();
_boExecViewController = Frame.GetController();
if (_boExecViewController != null)
{
// Subscribing to handling of controller's events for specific business operations.
_boExecViewController.BOEvents[typeof(TargetBO)].BusinessOperationCustomExecute += CustomizeBusinessOperationsController_BusinessOperationCustomExecute;
}
}