using System;

using System.Collections.Generic;

using System.ComponentModel.DataAnnotations;

​

public class Program

{

    public static void Main()

    {

        var instance = new Order();

        List<ValidationResult> validationResults = [];

​

        var validationContext = new ValidationContext(instance.DeliveryAddress);

​

        var isValid = Validator.TryValidateObject(

            instance.DeliveryAddress, validationContext, validationResults, validateAllProperties: true);

        Console.WriteLine(isValid);

        foreach (var result in validationResults)

        {

            result.Dump();

        }

    }

}

​

public sealed class Order

{

    public int OrderId { get; set; }

​

    // Set by the server during POST

    public string UserId { get; set; }

​

    public DateTime CreatedTime { get; set; }

​

    public Address DeliveryAddress { get; set; } = new();

}

​

public sealed class Address

{

    public int Id { get; set; }

​

    [Required, MinLength(3), MaxLength(100)]

    public string Name { get; set; }

​

    [Required, MaxLength(100)]

    public string Line1 { get; set; }

​

    [MaxLength(100)]

    public string Line2 { get; set; }

​

    [Required, MaxLength(50)]

    public string City { get; set; }

​

    [Required, MaxLength(20)]

    public string Region { get; set; }

​

    [Required, MaxLength(20)]

    public string PostalCode { get; set; }

}

​