protected ValidationContext CreateNewValidationContextForChildValidator(object instanceToValidate, PropertyValidatorContext propertyValidatorContext, IValidatorSelector validatorSelector)
{
var propertyChain = new PropertyChain(propertyValidatorContext.PropertyChain);
propertyChain.Add(propertyValidatorContext.Member);
return new ValidationContext(instanceToValidate, propertyChain, validatorSelector);
}
public void Should_not_be_subchain() {
chain.Add("Foo");
var otherChain = new PropertyChain();
otherChain.Add("Bar");
otherChain.IsChildChainOf(chain).ShouldBeFalse();
}
public void Should_be_subchain() {
chain.Add("Parent");
chain.Add("Child");
var childChain = new PropertyChain(chain);
childChain.Add("Grandchild");
childChain.IsChildChainOf(chain).ShouldBeTrue();
}
public void Should_not_be_subchain()
{
chain.Add("Foo");
var otherChain = new PropertyChain();
otherChain.Add("Bar");
otherChain.IsChildChainOf(chain).ShouldBeFalse();
}
public void Should_be_subchain()
{
chain.Add("Parent");
chain.Add("Child");
var childChain = new PropertyChain(chain);
childChain.Add("Grandchild");
childChain.IsChildChainOf(chain).ShouldBeTrue();
}
public IEnumerable <ValidationFailure> Validate(PropertyValidatorContext context)
{
var instanceToValidate = context.PropertyValue;
if (instanceToValidate == null)
{
return(Enumerable.Empty <ValidationFailure>());
}
var propertyChain = new PropertyChain(context.PropertyChain);
propertyChain.Add(context.PropertyName);
//Selector should not propogate to complex properties.
//If this property has been included then all child properties should be included.
var newContext = new ValidationContext <TProperty>((TProperty)instanceToValidate, propertyChain, new DefaultValidatorSelector());
var results = validator.SelectMany(x => x.Validate(newContext));
return(results);
}
public override IEnumerable<ValidationFailure> Validate(PropertyValidatorContext context)
{
if (context.Member == null) {
throw new InvalidOperationException(string.Format("Nested validators can only be used with Member Expressions."));
}
var collection = context.PropertyValue as IEnumerable;
if (collection == null) {
yield break;
}
int count = 0;
foreach (var element in collection) {
if(element == null) {
// If an element in the validator is null then we want to skip it to prevent NullReferenceExceptions in the child validator.
// We still need to update the counter to ensure the indexes are correct.
count++;
continue;
}
var childPropertyChain = new PropertyChain(context.PropertyChain);
childPropertyChain.Add(context.Member);
childPropertyChain.AddIndexer(count++);
//The ValidatorSelector should not be propogated downwards.
//If this collection property has been selected for validation, then all properties on those items should be validated.
var newContext = new ValidationContext(element, childPropertyChain, new DefaultValidatorSelector());
var results = childValidator.Validate(newContext).Errors;
foreach (var result in results) {
yield return result;
}
}
}
