zharro

using System.Collections.Generic;
using System.IO;
using System.Linq;

namespace ImmutableClearing
{
    class ApplicationService
    {
        private readonly string _directoryName;
        private readonly Persister _persister;

zharro

    public class CustomerService
    {
        public void Process(string customerName, string addressString)
        {
            Address address = CreateAddress(addressString);
            Customer customer = CreateCustomer(customerName, address);
            SaveCustomer(customer);
        }
        private Address CreateAddress(string addressString)
        {

zharro

using System;

class Appointment : Entity
{
    public string Title { get; set; }
    public int PatientId { get; set; }
    public int RoomId { get; private set; }
    public int? DoctorId { get; set; }
    public bool IsConfirmed { get; private set; }
    // Value object

zharro

using System;

class DateTimeRange : ValueObject<DateTimeRange>
{
    public DateTime Start { get; }
    public DateTime End { get; }

    public DateTimeRange(DateTime start, DateTime end)
    {
        Start = start;

zharro

/// <summary>
/// Agent for interacting with file system
/// </summary>
public class FileSystemAgent : IFileSystemAgent
{
    public IList<string> ReadAllLines(string fileName)
    {
        if (!File.Exists(fileName))
        {
            throw new ArgumentException($"File {fileName} doesn't exist");

zharro

using System;
using System.Collections.Generic;

namespace zharro.gists
{
    class ComparerFactory
    {
        public static IComparer<T> Create<T>(Comparison<T> comparer)
        {
            return new DelegateComparer<T>(comparer);