Does not seem to work on a controller action

[wasabii]

Using an object containing OptionalValues properties as a parameter in a controller action throws an error because the model validator tries to dig into it and invoke SpecifiedValue, which fails, if its unspecified.

System.InvalidOperationException: Value is unspecified.
   at OptionalValues.OptionalValue`1.get_SpecifiedValue()
   at Microsoft.Extensions.Internal.PropertyHelper.CallNullSafePropertyGetterByReference[TDeclaringType,TValue](ByRefFunc`2 getter, Object target)
   at Microsoft.AspNetCore.Mvc.ModelBinding.Validation.ValidationEntry.get_Model()
   at Microsoft.AspNetCore.Mvc.ModelBinding.Validation.ValidationVisitor.VisitChildren(IValidationStrategy strategy)
   at Microsoft.AspNetCore.Mvc.ModelBinding.Validation.ValidationVisitor.VisitComplexType(IValidationStrategy defaultStrategy)
   at Microsoft.AspNetCore.Mvc.ModelBinding.Validation.ValidationVisitor.VisitImplementation(ModelMetadata& metadata, String& key, Object model)
   at Microsoft.AspNetCore.Mvc.ModelBinding.Validation.ValidationVisitor.Visit(ModelMetadata metadata, String key, Object model)
   at Microsoft.AspNetCore.Mvc.ModelBinding.Validation.ValidationVisitor.VisitChildren(IValidationStrategy strategy)
   at Microsoft.AspNetCore.Mvc.ModelBinding.Validation.ValidationVisitor.VisitComplexType(IValidationStrategy defaultStrategy)
   at Microsoft.AspNetCore.Mvc.ModelBinding.Validation.ValidationVisitor.VisitImplementation(ModelMetadata& metadata, String& key, Object model)
   at Microsoft.AspNetCore.Mvc.ModelBinding.Validation.ValidationVisitor.Visit(ModelMetadata metadata, String key, Object model)
   at Microsoft.AspNetCore.Mvc.ModelBinding.ObjectModelValidator.Validate(ActionContext actionContext, ValidationStateDictionary validationState, String prefix, Object model, ModelMetadata metadata, Object container)
   at Microsoft.AspNetCore.Mvc.ModelBinding.ParameterBinder.EnforceBindRequiredAndValidate(ObjectModelValidator baseObjectValidator, ActionContext actionContext, ParameterDescriptor parameter, ModelMetadata metadata, ModelBindingContext modelBindingContext, ModelBindingResult modelBindingResult, Object container)

[desjoerd]

Thank you for submitting this!

I've created a new release which adds support to Mvc https://github.com/desjoerd/OptionalValues/releases/tag/v0.10.1.

The hoops and edge cases with a Option type are soo much fun.