public void GetModelValidator_DoesNotReadPropertyValues()
{
// Arrange
IEnumerable <ModelValidatorProvider> validatorProviders = new[] { new ObservableModelValidatorProvider() };
ObservableModel model = new ObservableModel();
ModelMetadata metadata = new EmptyModelMetadataProvider().GetMetadataForType(() => model, typeof(ObservableModel));
// Act
ModelValidator validator = ModelValidator.GetModelValidator(validatorProviders);
ModelValidationResult[] results = validator.Validate(metadata, model).ToArray();
// Assert
Assert.False(model.PropertyWasRead());
}
private void ValidateThis(HttpActionContext actionContext, ModelValidationNode parentNode)
{
ModelStateDictionary modelState = actionContext.ModelState;
if (!modelState.IsValidField(ModelStateKey))
{
return; // short-circuit
}
// If 'this' is null and there is no parent, we cannot validate, and
// the DataAnnotationsModelValidator will throw. So we intercept here
// to provide a catch-all value-required validation error
if (parentNode == null && ModelMetadata.Model == null)
{
string trueModelStateKey = ModelBindingHelper.CreatePropertyModelName(
ModelStateKey,
ModelMetadata.GetDisplayName()
);
modelState.AddModelError(trueModelStateKey, SRResources.Validation_ValueNotFound);
return;
}
_validators = actionContext.GetValidators(ModelMetadata);
object container = TryConvertContainerToMetadataType(parentNode);
// Optimize for the common case where the validators are in an array
ModelValidator[] validators = _validators.AsArray();
for (int i = 0; i < validators.Length; i++)
{
ModelValidator validator = validators[i];
foreach (
ModelValidationResult validationResult in validator.Validate(
ModelMetadata,
container
)
)
{
string trueModelStateKey = ModelBindingHelper.CreatePropertyModelName(
ModelStateKey,
validationResult.MemberName
);
modelState.AddModelError(trueModelStateKey, validationResult.Message);
}
}
}
protected virtual void SetProperty(HttpActionContext actionContext, ModelBindingContext bindingContext, ModelMetadata propertyMetadata, ComplexModelDtoResult dtoResult, ModelValidator requiredValidator)
{
PropertyDescriptor propertyDescriptor = TypeDescriptorHelper.Get(bindingContext.ModelType).GetProperties().Find(propertyMetadata.PropertyName, true /* ignoreCase */);
if (propertyDescriptor == null || propertyDescriptor.IsReadOnly)
{
return; // nothing to do
}
object value = dtoResult.Model ?? GetPropertyDefaultValue(propertyDescriptor);
propertyMetadata.Model = value;
// 'Required' validators need to run first so that we can provide useful error messages if
// the property setters throw, e.g. if we're setting entity keys to null. See comments in
// DefaultModelBinder.SetProperty() for more information.
if (value == null)
{
string modelStateKey = dtoResult.ValidationNode.ModelStateKey;
if (bindingContext.ModelState.IsValidField(modelStateKey))
{
if (requiredValidator != null)
{
foreach (ModelValidationResult validationResult in requiredValidator.Validate(propertyMetadata, bindingContext.Model))
{
bindingContext.ModelState.AddModelError(modelStateKey, validationResult.Message);
}
}
}
}
if (value != null || TypeHelper.TypeAllowsNullValue(propertyDescriptor.PropertyType))
{
try
{
propertyDescriptor.SetValue(bindingContext.Model, value);
}
catch (Exception ex)
{
// don't display a duplicate error message if a binding error has already occurred for this field
string modelStateKey = dtoResult.ValidationNode.ModelStateKey;
if (bindingContext.ModelState.IsValidField(modelStateKey))
{
bindingContext.ModelState.AddModelError(modelStateKey, ex);
}
}
}
else
{
// trying to set a non-nullable value type to null, need to make sure there's a message
string modelStateKey = dtoResult.ValidationNode.ModelStateKey;
if (bindingContext.ModelState.IsValidField(modelStateKey))
{
dtoResult.ValidationNode.Validated += CreateNullCheckFailedHandler(propertyMetadata, value);
}
}
}
// Returns true if validator execution adds a model error.
private static bool RunValidator(ModelValidator validator, ModelBindingContext bindingContext,
ModelMetadata propertyMetadata, string modelStateKey)
{
bool addedError = false;
if (validator != null)
{
foreach (ModelValidationResult validationResult in validator.Validate(propertyMetadata, bindingContext.Model))
{
bindingContext.ModelState.AddModelError(modelStateKey, validationResult.Message);
addedError = true;
}
}
return addedError;
}