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@vkhorikov
vkhorikov / 1.cs
Last active May 10, 2018 03:29
Value Objects and Identity
public class PlanningTool
{
internal int Id { get; private set; }
// Rest of class
public ICollection<PlanningToolTab> Tabs { get; private set; }
}
public class PlanningToolTab
{
public class Student : Entity
{
public string FirstName { get; private set; }
public string LastName { get; private set; }
public int FavoriteCourseId { get; private set; } // Foreign key
}
public class Course : Entity
{
public string Title { get; private set; }
@vkhorikov
vkhorikov / 1.cs
Created August 11, 2018 10:52
Base entity class
public abstract class Entity
{
public virtual long Id { get; protected set; }
protected virtual object Actual => this;
public override bool Equals(object obj)
{
var other = obj as Entity;
if (other is null)
@vkhorikov
vkhorikov / 1.cs
Last active September 8, 2018 23:13
In Defense of Lazy Loading
public class Student : Entity
{
public virtual string Name { get; set; }
public virtual decimal TotalDebt { get; set; }
public virtual IList<Enrollment> Enrollments { get; set; }
public virtual IList<SportsActivity> SportsActivities { get; set; }
}
public class Enrollment : Entity
@vkhorikov
vkhorikov / 1.cs
Last active December 24, 2018 16:05
Hierarchy of value objects
public class Person : Entity
{
public virtual string Name { get; set; }
public virtual Document Document { get; set; }
}
public class Document : Entity
{
}
@vkhorikov
vkhorikov / full.cs
Last active April 4, 2021 10:19
Hierarchy of value objects - full code
public class Person : Entity
{
public virtual string Name { get; set; }
private readonly DocumentContainer _document;
public virtual Document Document
{
get => _document.Document;
set => _document.Document = value;
}
@vkhorikov
vkhorikov / 1.cs
Last active January 29, 2019 17:37
Are CQRS commands part of the domain model?
public IActionResult EditPersonalInfo([FromBody] EditPersonalInfoCommand command)
{
var handler = new EditPersonalInfoCommandHandler(_unitOfWork);
Result result = handler.Handle(command);
return result.IsSuccess ? Ok() : Error(result.Error);
}
@vkhorikov
vkhorikov / 1.cs
Last active February 20, 2019 16:12
When to validate commands in CQRS
public sealed class EnrollCommand : ICommand
{
public long StudentId { get; }
public string Course { get; }
public string Grade { get; }
public EnrollCommand(long studentId, string course, string grade)
{
if (course == null || grade == null) // Precondition checks
throw ArgumentException();
@vkhorikov
vkhorikov / 1.cs
Last active April 15, 2019 21:35
CQRS and exception handling
public class EditPersonalInfoCommandHandler : ICommandHandler<EditPersonalInfoCommand>
{
public Result Handle(EditPersonalInfoCommand command)
{
for (int i = 0; ; i++)
{
try
{
var unitOfWork = new UnitOfWork(_sessionFactory);
Student student = unitOfWork.GetStudentById(command.Id);
@vkhorikov
vkhorikov / 1.cs
Last active June 6, 2019 18:28
Merging domain events
public sealed class Messages
{
private readonly IServiceProvider _provider;
public Messages(IServiceProvider provider)
{
_provider = provider;
}
public void Dispatch(IDomainEvent domainEvent)