This repository was archived by the owner on Dec 14, 2018. It is now read-only.
This repository was archived by the owner on Dec 14, 2018. It is now read-only.
Ignore validation of model property #4143
Description
Hello,
For implementation of PATCH method where I need to distinguish between property being null or not set, e.g. {"key": null} vs {}.
I have a following model (see below) used to define optional json properties similar to null-able, but it can take any type.
It works for deserialization in tests, but when used inside controller method, then an InvalidOperationException is thrown before my code even runs, because ValidationVisitor from framework iterates over public properties of my model and hits Value property of instance with IsSet==false, which leads to exception.
Is there a way to tell ValidationVisitor to ignore certain property or define a custom validation property?
[JsonConverter(typeof(OptionalJsonConverter))]
public struct Optional<T>
{
public static Optional<T> Undefined => default(Optional<T>);
private T _value;
public Optional(T value)
{
IsSet = true;
_value = value;
}
public bool IsSet { get; private set; }
public T Value
{
get
{
if (IsSet)
{
return _value;
}
throw new InvalidOperationException("The value is undefined.");
}
set
{
IsSet = true;
_value = value;
}
}
}Here is a stack-trace (minor parts of it is in Russian)
в WebApi.Optional`1.get_Value() в D:\WebApi\Optional.cs:строка 30
в Microsoft.Extensions.Internal.PropertyHelper.CallNullSafePropertyGetterByReference[TDeclaringType,TValue](ByRefFunc`2 getter, Object target)
в Microsoft.AspNet.Mvc.ModelBinding.Validation.DefaultComplexObjectValidationStrategy.Enumerator.MoveNext()
в Microsoft.AspNet.Mvc.ModelBinding.Validation.ValidationVisitor.VisitChildren(IValidationStrategy strategy)
в Microsoft.AspNet.Mvc.ModelBinding.Validation.ValidationVisitor.VisitComplexType()
в Microsoft.AspNet.Mvc.ModelBinding.Validation.ValidationVisitor.Visit(ModelMetadata metadata, String key, Object model)
в Microsoft.AspNet.Mvc.ModelBinding.Validation.ValidationVisitor.VisitChildren(IValidationStrategy strategy)
в Microsoft.AspNet.Mvc.ModelBinding.Validation.ValidationVisitor.VisitComplexType()
в Microsoft.AspNet.Mvc.ModelBinding.Validation.ValidationVisitor.Visit(ModelMetadata metadata, String key, Object model)
в Microsoft.AspNet.Mvc.ModelBinding.Validation.ValidationVisitor.Validate(ModelMetadata metadata, String key, Object model)
в Microsoft.AspNet.Mvc.ModelBinding.Validation.DefaultObjectValidator.Validate(IModelValidatorProvider validatorProvider, ModelStateDictionary modelState, ValidationStateDictionary validationState, String prefix, Object model)
в Microsoft.AspNet.Mvc.Controllers.DefaultControllerActionArgumentBinder.<BindModelAsync>d__6.MoveNext()