using System;

using FluentValidation;

​

public class Person

{

    public int HourlyRate {get;set;}

    public ChildClass Child{get;set;}

}

public class ChildClass

{

    public string Name {get;set;}

}

​

public class PersonValidator : AbstractValidator<Person>

{

    public PersonValidator()

    {

        RuleFor(validateField => validateField.HourlyRate)

        .Cascade(CascadeMode.Stop)

       .Must(HourlyRateValidation)

       .WithErrorCode("123")

       .WithMessage("not in range");

       RuleFor(f=>f).ChildRules(parent=>

       {

            RuleFor(x=>x.Child.Name)

            .Cascade(CascadeMode.Stop)

            .NotEmpty()

            .MinimumLength(1)

            .Must(x=>x.Contains("bob"))

            .WithMessage("not bob");

       });

    }

    private bool HourlyRateValidation(int hourlyRate)

    {

        return hourlyRate >= 10 && hourlyRate <= 100;

    }

}

​

public class Program

{

    public static void Main()

    {

        var fail1 = new Person { HourlyRate=9,Child=new (){Name="jack"}};

        var fail2 = new Person { HourlyRate=101,Child=new (){Name=""}};

        var pass1 = new Person {HourlyRate=10,Child=new (){Name="bob"}};

        var pass2 = new Person { HourlyRate=100,Child=new (){Name="bob"}};

​

        var validator = new PersonValidator();

​

        PrintValidationResult(validator.Validate(fail1),"fail1:");

        PrintValidationResult(validator.Validate(fail2),"fail2:");

        PrintValidationResult(validator.Validate(pass1),"pass1:");

        PrintValidationResult(validator.Validate(pass2),"pass2:");

    }

​

    public static void PrintValidationResult(FluentValidation.Results.ValidationResult result,string objectName)

    {

        Console.WriteLine(objectName);

        if (result.IsValid)

        {

            Console.WriteLine("✅ Validation successful");

        }

        else

        {

            foreach (var error in result.Errors)

            {

                Console.WriteLine("❌ " + error.ErrorMessage);

            }

        }

        Console.WriteLine();

    }

}

​