protected virtual void SetProperty(ModelBindingExecutionContext modelBindingExecutionContext, ModelBindingContext bindingContext, ModelMetadata propertyMetadata, ComplexModelResult complexModelResult) { PropertyDescriptor propertyDescriptor = TypeDescriptorHelper.Get(bindingContext.ModelType).GetProperties().Find(propertyMetadata.PropertyName, true /* ignoreCase */); if (propertyDescriptor == null || propertyDescriptor.IsReadOnly) { return; // nothing to do } object value = complexModelResult.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 = complexModelResult.ValidationNode.ModelStateKey; if (bindingContext.ModelState.IsValidField(modelStateKey)) { ModelValidator requiredValidator = ModelValidatorProviders.Providers.GetValidators(propertyMetadata, modelBindingExecutionContext).Where(v => v.IsRequired).FirstOrDefault(); if (requiredValidator != null) { foreach (ModelValidationResult validationResult in requiredValidator.Validate(bindingContext.Model)) { bindingContext.ModelState.AddModelError(modelStateKey, validationResult.Message); } } } } if (value != null || TypeHelpers.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 = complexModelResult.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 = complexModelResult.ValidationNode.ModelStateKey; if (bindingContext.ModelState.IsValidField(modelStateKey)) { complexModelResult.ValidationNode.Validated += CreateNullCheckFailedHandler(modelBindingExecutionContext, propertyMetadata, value); } } }
public ModelMetadata(ModelMetadataProvider provider, Type containerType, Func <object> modelAccessor, Type modelType, string propertyName) { if (provider == null) { throw new ArgumentNullException("provider"); } if (modelType == null) { throw new ArgumentNullException("modelType"); } Provider = provider; _containerType = containerType; _isRequired = !TypeHelpers.TypeAllowsNullValue(modelType); _modelAccessor = modelAccessor; _modelType = modelType; _propertyName = propertyName; }