If you were using ValidationDef you can make a trick and use
ValidateInstance method to resolve validators from container.
You're asking about attributes, so: the solution that worked earlier for us:
You can ry implement IConstraintValidatorFactory that will be resolving
components trough container.
Then you introduce a marker interface - IContainerAwareValidator to mark
validators you want to resolve trough container.
After that, register your factory:
new
FluentConfiguration().SetConstraintValidatorFactory<ContainerAwareConstraintValidatorFactory>()
Factory example:
public class ContainerAwareConstraintValidatorFactory :
IConstraintValidatorFactory
{
public virtual IValidator GetInstance(Type type)
{
if (typeof(IContainerAwareValidator).IsAssignableFrom(type))
if (!IoC.Container.Kernel.HasComponent(type))
throw new Exception(string.Format("Validator of type {0} not registered in
IOC container", type.Name));
else
return IoC.Resolve(type) as IValidator;
ThrowIfHasDependences(type);
return (IValidator)Activator.CreateInstance(type);
}
private static void ThrowIfHasDependences(Type type)
{
foreach (var constructorInfo in type.GetConstructors())
{
if( constructorInfo.GetParameters().Length > 0)
throw new Exception(string.Format("Validator of type {0} has dependencies -
it should implement IContainerAwareValidator interface, to be resolved from
IOC container ", type.Name));
}
}
}
On Fri, Aug 20, 2010 at 4:29 PM, MattO <[email protected]> wrote:
> I have created a custom validator that I wish to put on one of my
> business objects attributes to do validation before an object is
> persisted to the database.
>
> In order for validation to be successful though I need to be able to
> pass in the variable to the custom validator, it is NOT a constant
> like all the other examples I've seen. How do you do this??? For
> instance where I have ExamType="blah" below, I need to be able to pass
> in the actual exam type property from the business object which is
> contained in the same class, but I don't see how you can do that.
>
> public class ActiveContentCodeAttribute : Attribute, IRuleArgs
> {
> private string _examType = string.Empty;
> public string ExamType
> {
> get { return _examType; }
> set { _examType = value; }
> }
> }
>
> public class ActiveContentCodeValidator :
> IInitializableValidator<ActiveContentCodeAttribute>
> {
> private string _examType = string.Empty;
> public bool IsValid(object value)
> {
> //TODO: Check database to see if the examtype is already
> active
> return true;
> }
> public void Initialize(ActiveContentCodeAttribute parameters)
> {
> _examType = parameters.ExamType;
> }
> }
>
> And on my business object class I have done this:
>
> [ActiveContentCode(ExamType="blah")
> public virtual bool Active
> {
> get { return _active; }
> set
> {
> OnActiveChanging();
> _active = value;
> OnActiveChanged();
> }
> }
>
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