Architecture

This project is an example of architecture using new technologies and best practices.

The goal is to share knowledge and use it as reference for new projects.

Thanks for enjoying!

Technologies

• .NET 5
• ASP.NET Core 5
• Entity Framework Core 5
• C# 9
• Angular 11
• UIkit

Practices

• Clean Code
• SOLID Principles
• DDD (Domain-Driven Design)
• Separation of Concerns

Run

Utils

Nuget Packages

Source: https://github.com/rafaelfgx/DotNetCore

Published: https://www.nuget.org/profiles/rafaelfgx

Layers

Web: Frontend and API.

Application: Flow control.

Domain: Business rules and domain logic.

Model: Data transfer objects.

Database: Data persistence.

Web

Frontend

Service

export class AppCustomerService {
    constructor(
        private readonly http: HttpClient,
        private readonly gridService: GridService) { }

    add(model: CustomerModel) {
        return this.http.post<number>("customers", model);
    }

    delete(id: number) {
        return this.http.delete(`customers/${id}`);
    }

    get(id: number) {
        return this.http.get<CustomerModel>(`customers/${id}`);
    }

    grid(parameters: GridParametersModel) {
        return this.gridService.get<CustomerModel>("customers/grid", parameters);
    }

    inactivate(id: number) {
        return this.http.patch(`customers/${id}/inactivate`, {});
    }

    list() {
        return this.http.get<CustomerModel[]>("customers");
    }

    update(model: CustomerModel) {
        return this.http.put(`customers/${model.id}`, model);
    }
}

Guard

export class AppGuard implements CanActivate {
    constructor(private readonly appAuthService: AppAuthService) { }

    canActivate() {
        if (this.appAuthService.authenticated()) { return true; }
        this.appAuthService.signin();
        return false;
    }
}

ErrorHandler

export class AppErrorHandler implements ErrorHandler {
    constructor(private readonly appModalService: AppModalService) { }

    handleError(error: any) {
        if (error instanceof HttpErrorResponse) {
            switch (error.status) {
                case 422: {
                    this.appModalService.alert(error.error);
                    return;
                }
            }
        }

        console.error(error);
    }
}

HttpInterceptor

export class AppHttpInterceptor implements HttpInterceptor {
    constructor(private readonly appAuthService: AppAuthService) { }

    intercept(request: HttpRequest<any>, next: HttpHandler) {
        request = request.clone({
            setHeaders: { Authorization: `Bearer ${this.appAuthService.token()}` }
        });

        return next.handle(request);
    }
}

API

Startup

public sealed class Startup
{
    public void Configure(IApplicationBuilder application)
    {
        application.UseException();
        application.UseHttps();
        application.UseRouting();
        application.UseResponseCompression();
        application.UseAuthentication();
        application.UseAuthorization();
        application.UseEndpoints();
        application.UseSpa();
    }

    public void ConfigureServices(IServiceCollection services)
    {
        services.AddSecurity();
        services.AddResponseCompression();
        services.AddControllersMvcJsonOptions();
        services.AddSpa();
        services.AddContext();
        services.AddServices();
    }
}

Controller

[ApiController]
[Route("customers")]
public sealed class CustomerController : ControllerBase
{
    private readonly ICustomerService _customerService;

    public CustomerController(ICustomerService customerService)
    {
        _customerService = customerService;
    }

    [HttpPost]
    public Task<IActionResult> AddAsync(CustomerModel model)
    {
        return _customerService.AddAsync(model).ResultAsync();
    }

    [HttpDelete("{id}")]
    public Task<IActionResult> DeleteAsync(long id)
    {
        return _customerService.DeleteAsync(id).ResultAsync();
    }

    [HttpGet("{id}")]
    public Task<IActionResult> GetAsync(long id)
    {
        return _customerService.GetAsync(id).ResultAsync();
    }

    [HttpGet("grid")]
    public Task<IActionResult> GridAsync([FromQuery] GridParameters parameters)
    {
        return _customerService.GridAsync(parameters).ResultAsync();
    }

    [HttpPatch("{id}/inactivate")]
    public Task InactivateAsync(long id)
    {
        return _customerService.InactivateAsync(id);
    }

    [HttpGet]
    public Task<IActionResult> ListAsync()
    {
        return _customerService.ListAsync().ResultAsync();
    }

    [HttpPut("{id}")]
    public Task<IActionResult> UpdateAsync(CustomerModel model)
    {
        return _customerService.UpdateAsync(model).ResultAsync();
    }
}

Application

Service

public sealed class CustomerService : ICustomerService
{
    private readonly ICustomerFactory _customerFactory;
    private readonly ICustomerRepository _customerRepository;
    private readonly IUnitOfWork _unitOfWork;

    public CustomerService
    (
        ICustomerFactory customerFactory,
        ICustomerRepository customerRepository,
        IUnitOfWork unitOfWork
    )
    {
        _customerFactory = customerFactory;
        _customerRepository = customerRepository;
        _unitOfWork = unitOfWork;
    }

    public async Task<IResult<long>> AddAsync(CustomerModel model)
    {
        var validation = await new AddCustomerModelValidator().ValidationAsync(model);

        if (validation.Failed)
        {
            return Result<long>.Fail(validation.Message);
        }

        var customer = _customerFactory.Create(model);

        await _customerRepository.AddAsync(customer);

        await _unitOfWork.SaveChangesAsync();

        return Result<long>.Success(customer.Id);
    }

    public async Task<IResult> DeleteAsync(long id)
    {
        await _customerRepository.DeleteAsync(id);

        await _unitOfWork.SaveChangesAsync();

        return Result.Success();
    }

    public Task<CustomerModel> GetAsync(long id)
    {
        return _customerRepository.GetModelAsync(id);
    }

    public Task<Grid<CustomerModel>> GridAsync(GridParameters parameters)
    {
        return _customerRepository.GridAsync(parameters);
    }

    public async Task InactivateAsync(long id)
    {
        var customer = new Customer(id);

        customer.Inactivate();

        await _customerRepository.InactivateAsync(customer);

        await _unitOfWork.SaveChangesAsync();
    }

    public Task<IEnumerable<CustomerModel>> ListAsync()
    {
        return _customerRepository.ListModelAsync();
    }

    public async Task<IResult> UpdateAsync(CustomerModel model)
    {
        var validation = await new UpdateCustomerModelValidator().ValidationAsync(model);

        if (validation.Failed)
        {
            return Result.Fail(validation.Message);
        }

        var customer = _customerFactory.Create(model);

        await _customerRepository.UpdateAsync(customer.Id, customer);

        await _unitOfWork.SaveChangesAsync();

        return Result.Success();
    }
}

Factory

public sealed class CustomerFactory : ICustomerFactory
{
    public Customer Create(CustomerModel model)
    {
        return new Customer
        (
            model.Id,
            new Name(model.FirstName, model.LastName),
            new Email(model.Email)
        );
    }
}

Domain

Entity

public sealed class Customer : Entity<long>
{
    public Customer(long id) : base(id) { }

    public Customer
    (
        long id,
        Name name,
        Email email
    )
    : base(id)
    {
        Name = name;
        Email = email;
        Activate();
    }

    public Name Name { get; private set; }

    public Email Email { get; private set; }

    public Status Status { get; private set; }

    public void Activate()
    {
        Status = Status.Active;
    }

    public void Inactivate()
    {
        Status = Status.Inactive;
    }
}

ValueObject

public sealed record Name(string FirstName, string LastName);

Model

Model

public sealed record CustomerModel
{
    public long Id { get; init; }

    public string FirstName { get; init; }

    public string LastName { get; init; }

    public string Email { get; init; }
}

ModelValidator

public abstract class CustomerModelValidator : AbstractValidator<CustomerModel>
{
    public CustomerModelValidator Id()
    {
        RuleFor(customer => customer.Id).NotEmpty();
        return this;
    }

    public CustomerModelValidator FirstName()
    {
        RuleFor(customer => customer.FirstName).NotEmpty();
        return this;
    }

    public CustomerModelValidator LastName()
    {
        RuleFor(customer => customer.LastName).NotEmpty();
        return this;
    }

    public CustomerModelValidator Email()
    {
        RuleFor(customer => customer.Email).EmailAddress();
        return this;
    }
}

public sealed class AddCustomerModelValidator : CustomerModelValidator
{
    public AddCustomerModelValidator() => FirstName().LastName().Email();
}

public sealed class UpdateCustomerModelValidator : CustomerModelValidator
{
    public UpdateCustomerModelValidator() => Id().FirstName().LastName().Email();
}

public sealed class DeleteCustomerModelValidator : CustomerModelValidator
{
    public DeleteCustomerModelValidator() => Id();
}

Database

Context

public sealed class Context : DbContext
{
    public Context(DbContextOptions options) : base(options) { }

    protected override void OnModelCreating(ModelBuilder builder)
    {
        builder.ApplyConfigurationsFromAssembly(typeof(Context).Assembly).Seed();
    }
}

Configuration

public sealed class CustomerConfiguration : IEntityTypeConfiguration<Customer>
{
    public void Configure(EntityTypeBuilder<Customer> builder)
    {
        builder.ToTable(nameof(Customer), nameof(Customer));

        builder.HasKey(customer => customer.Id);

        builder.Property(customer => customer.Id).ValueGeneratedOnAdd().IsRequired();

        builder.Property(customer => customer.Status).IsRequired();

        builder.OwnsOne(customer => customer.Name, customerName =>
        {
            customerName.Property(name => name.FirstName).HasColumnName(nameof(Name.FirstName)).HasMaxLength(100).IsRequired();

            customerName.Property(name => name.LastName).HasColumnName(nameof(Name.LastName)).HasMaxLength(200).IsRequired();
        });

        builder.OwnsOne(customer => customer.Email, customerEmail =>
        {
            customerEmail.Property(email => email.Value).HasColumnName(nameof(User.Email)).HasMaxLength(300).IsRequired();

            customerEmail.HasIndex(email => email.Value).IsUnique();
        });
    }
}

Repository

public sealed class CustomerRepository : EFRepository<Customer>, ICustomerRepository
{
    public CustomerRepository(Context context) : base(context) { }

    public Task<CustomerModel> GetModelAsync(long id)
    {
        return Queryable.Where(CustomerExpression.Id(id)).Select(CustomerExpression.Model).SingleOrDefaultAsync();
    }

    public Task<Grid<CustomerModel>> GridAsync(GridParameters parameters)
    {
        return Queryable.Select(CustomerExpression.Model).GridAsync(parameters);
    }

    public Task InactivateAsync(Customer customer)
    {
        return UpdatePartialAsync(customer.Id, new { customer.Status });
    }

    public async Task<IEnumerable<CustomerModel>> ListModelAsync()
    {
        return await Queryable.Select(CustomerExpression.Model).ToListAsync();
    }
}

Expression

public static class CustomerExpression
{
    public static Expression<Func<Customer, CustomerModel>> Model => customer => new CustomerModel
    {
        Id = user.Id,
        FirstName = user.Name.FirstName,
        LastName = user.Name.LastName,
        Email = user.Email.Value
    };

    public static Expression<Func<Customer, bool>> Id(long id)
    {
        return customer => customer.Id == id;
    }
}