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using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;

// source: https://github.com/jhewlett/ValueObject
[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field)]
internal sealed class IgnoreMemberAttribute : Attribute
{ }

internal interface IValueObject<T>
    : IEquatable<T>
{
    public int GetHashCode();

    public int HashValue(int seed, object value);
}

// Learn more: https://docs.microsoft.com/en-us/dotnet/standard/microservices-architecture/microservice-ddd-cqrs-patterns/implement-value-objects
// source: https://github.com/jhewlett/ValueObject
public abstract class ValueObject : IValueObject<ValueObject>
{
    private List<FieldInfo>? _fields;

    private List<PropertyInfo>? _properties;

    #region IValueObject<ValueObject> Members

    public override int GetHashCode()
    {
        var hash = GetProperties()
           .Select(property => property.GetValue(this, null))
           .Aggregate(17, HashValue);

        return GetFields()
           .Select(field => field.GetValue(this))
           .Aggregate(hash, HashValue);
    }

    public int HashValue(int seed, object? value)
    {
        var currentHash = value?.GetHashCode() ?? 0;

        return seed * 23 + currentHash;
    }

    public virtual bool Equals(ValueObject? other) => Equals(other as object);

    #endregion

    public static bool operator ==(ValueObject? left, ValueObject? right)
    {
        if (left is null ^ right is null) return false;

        return left?.Equals(right) != false;
    }

    public static bool operator !=(ValueObject? left, ValueObject? right) => !(left == right);

    public override bool Equals(object? obj)
    {
        if (obj           == null
         || obj.GetType() != GetType()) return false;

        return GetProperties().All(p => PropertiesAreEqual(obj, p))
            && GetFields().All(f => FieldsAreEqual(obj, f));
    }

    private bool PropertiesAreEqual(object obj, PropertyInfo p) =>
        Equals(p.GetValue(this, null), p.GetValue(obj, null));

    private bool FieldsAreEqual(object obj, FieldInfo f) => Equals(f.GetValue(this), f.GetValue(obj));

    private IEnumerable<PropertyInfo> GetProperties()
    {
        return _properties ??= GetType()
           .GetProperties(BindingFlags.Instance | BindingFlags.Public)
           .Where(p => p.GetCustomAttribute(typeof(IgnoreMemberAttribute)) is null)
           .ToList();
    }

    private IEnumerable<FieldInfo> GetFields()
    {
        return _fields ??= GetType()
           .GetFields(BindingFlags.Instance | BindingFlags.Public)
           .Where(f => f.GetCustomAttribute(typeof(IgnoreMemberAttribute)) is null)
           .ToList();
    }
}

public sealed class FullNameVo : ValueObject
{
    public FullNameVo(string name, string surname)
    {
        Name    = name;
        Surname = surname;
    }

    [IgnoreMember]
    public string Name { get; }

    public string Surname { get; }

    [IgnoreMember]
    public string FullName => $"{Name} {Surname}";
}

internal class Program
{
    private static void Main(string[] args)
    {
        var user1 = new FullNameVo("John", "Doe");
        var user2 = new FullNameVo("John", "Doe");
        var user3 = new FullNameVo("Jane", "Doe");

        Console.WriteLine(user1 == user2); // True
        Console.WriteLine(ReferenceEquals(user1, user2)); // False
        Console.WriteLine(user1 == user3); // True
        Console.WriteLine(user1.Equals(user3)); // True
    }
}

 
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
​
// source: https://github.com/jhewlett/ValueObject
[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field)]
internal sealed class IgnoreMemberAttribute : Attribute
{ }
​
internal interface IValueObject<T>
    : IEquatable<T>
{
    public int GetHashCode();
​
    public int HashValue(int seed, object value);
}
​
// Learn more: https://docs.microsoft.com/en-us/dotnet/standard/microservices-architecture/microservice-ddd-cqrs-patterns/implement-value-objects
// source: https://github.com/jhewlett/ValueObject
public abstract class ValueObject : IValueObject<ValueObject>
{
    private List<FieldInfo>? _fields;
​

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