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using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace NHail.ComponentModel.DataAnnotations.Fluent
public class ValidateIfAttribute : ValidationAttribute
private readonly IDictionary<string, Func<object, object>> _properties;
private readonly ValidationAttribute _validation;
public ValidateIfAttribute(IDictionary<string, Func<object, object>> properties, ValidationAttribute validation)
_properties = properties;
_validation = validation;
protected override ValidationResult IsValid(object value, ValidationContext validationContext)
var valid = _properties.All(p => Validator.TryValidateProperty(p.Value(validationContext.ObjectInstance),
new ValidationContext(validationContext.ObjectInstance, validationContext.ServiceContainer,
{MemberName = p.Key}, null));
return valid ? _validation.GetValidationResult(value, validationContext) : ValidationResult.Success;
public override bool RequiresValidationContext => true;