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Vertical Slice Architecture: rebuild the sample as an event ticketing API on net10.0
Replace the net8.0 games-and-consoles sample (MediatR 12.2.0, AutoMapper 13.0.1, EF Core InMemory, Swashbuckle, a shared ServiceManager) with the article's build: one minimal API project with three feature slices, an Event entity that guards its capacity rule, a Result type mapped to problem details, built-in validation, and EF Core SQLite 10.0.12. Tests run the slices against SQLite in memory and an architecture test keeps features from depending on each other. Classic EventTicketing.sln for the CI, launch profile on port 5000 so the .http file works from an IDE, and a folder .gitignore for the SQLite file. Removes the NU1903 advisory on AutoMapper 13.0.1 and the nullability warnings.
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‎csharp-architectural-patterns/VerticalSliceArchitecture/.gitignore‎

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tickets.db
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tickets.db-shm
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tickets.db-wal

‎csharp-architectural-patterns/VerticalSliceArchitecture/EventTicketing.Tests/EventTicketing.Tests.csproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<TargetFramework>net10.0</TargetFramework>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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<IsPackable>false</IsPackable>
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<IsTestProject>true</IsTestProject>
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</PropertyGroup>
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<ItemGroup>
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<Using Include="Xunit" />
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</ItemGroup>
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<ItemGroup>
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<PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.10.1" />
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<PackageReference Include="NetArchTest.Rules" Version="1.3.2" />
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<PackageReference Include="xunit.v3.mtp-off" Version="4.0.1" />
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<PackageReference Include="xunit.runner.visualstudio" Version="4.0.0" />
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</ItemGroup>
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<ItemGroup>
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<ProjectReference Include="..\EventTicketing\EventTicketing.csproj" />
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</ItemGroup>
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</Project>

‎csharp-architectural-patterns/VerticalSliceArchitecture/EventTicketing.Tests/ReserveTicketsTests.cs‎

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using EventTicketing.Data;
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using EventTicketing.Features.Reservations;
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using Microsoft.Data.Sqlite;
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using Microsoft.EntityFrameworkCore;
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namespace EventTicketing.Tests;
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public sealed class ReserveTicketsTests : IDisposable
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{
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private readonly SqliteConnection _connection = new("Data Source=:memory:");
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public ReserveTicketsTests() => _connection.Open();
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public void Dispose() => _connection.Dispose();
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private TicketingDbContext CreateDbContext()
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{
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var options = new DbContextOptionsBuilder<TicketingDbContext>()
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.UseSqlite(_connection)
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.Options;
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var dbContext = new TicketingDbContext(options);
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dbContext.Database.EnsureCreated();
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return dbContext;
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}
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[Fact]
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public async Task HandleAsync_WhenTicketsAreAvailable_SavesTheReservation()
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{
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var handler = new ReserveTickets.Handler(CreateDbContext());
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var result = await handler.HandleAsync(eventId: 1, quantity: 3, TestContext.Current.CancellationToken);
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Assert.True(result.IsSuccess);
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Assert.Equal(97, result.Value.TicketsLeft);
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var saved = await CreateDbContext().Events.SingleAsync(e => e.Id == 1, TestContext.Current.CancellationToken);
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Assert.Equal(3, saved.TicketsSold);
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}
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[Fact]
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public async Task HandleAsync_WhenTheEventIsSoldOut_SavesNothing()
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{
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var handler = new ReserveTickets.Handler(CreateDbContext());
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var result = await handler.HandleAsync(eventId: 2, quantity: 3, TestContext.Current.CancellationToken);
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Assert.False(result.IsSuccess);
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Assert.Equal("Event.SoldOut", result.Error!.Code);
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var saved = await CreateDbContext().Events.SingleAsync(e => e.Id == 2, TestContext.Current.CancellationToken);
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Assert.Equal(0, saved.TicketsSold);
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}
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}

‎csharp-architectural-patterns/VerticalSliceArchitecture/EventTicketing.Tests/SliceTests.cs‎

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using EventTicketing.Features.Reservations;
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using NetArchTest.Rules;
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namespace EventTicketing.Tests;
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public class SliceTests
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{
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[Fact]
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public void Features_DoNotDependOnEachOther()
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{
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var assembly = typeof(ReserveTickets).Assembly;
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var features = assembly.GetTypes()
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.Select(t => t.Namespace)
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.OfType<string>()
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.Where(ns => ns.StartsWith("EventTicketing.Features."))
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.Distinct()
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.ToArray();
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foreach (var feature in features)
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{
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var otherFeatures = features.Where(f => f != feature).ToArray();
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var result = Types.InAssembly(assembly)
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.That()
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.ResideInNamespace(feature)
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.ShouldNot()
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.HaveDependencyOnAny(otherFeatures)
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.GetResult();
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Assert.True(result.IsSuccessful,
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$"{feature} depends on another feature: " + string.Join(", ", result.FailingTypeNames ?? []));
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}
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}
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}

‎csharp-architectural-patterns/VerticalSliceArchitecture/EventTicketing.sln‎

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Microsoft Visual Studio Solution File, Format Version 12.00
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# Visual Studio Version 17
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VisualStudioVersion = 17.0.31903.59
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MinimumVisualStudioVersion = 10.0.40219.1
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "EventTicketing", "EventTicketing\EventTicketing.csproj", "{5FAF63F8-89C3-4EEE-A3A0-DCB365CA69B6}"
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EndProject
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "EventTicketing.Tests", "EventTicketing.Tests\EventTicketing.Tests.csproj", "{4B09EE23-0672-4FE0-8078-430028A5351E}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
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Debug|x64 = Debug|x64
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Debug|x86 = Debug|x86
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Release|Any CPU = Release|Any CPU
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Release|x64 = Release|x64
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Release|x86 = Release|x86
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EndGlobalSection
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GlobalSection(ProjectConfigurationPlatforms) = postSolution
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{5FAF63F8-89C3-4EEE-A3A0-DCB365CA69B6}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{5FAF63F8-89C3-4EEE-A3A0-DCB365CA69B6}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{5FAF63F8-89C3-4EEE-A3A0-DCB365CA69B6}.Debug|x64.ActiveCfg = Debug|Any CPU
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{5FAF63F8-89C3-4EEE-A3A0-DCB365CA69B6}.Debug|x64.Build.0 = Debug|Any CPU
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{5FAF63F8-89C3-4EEE-A3A0-DCB365CA69B6}.Debug|x86.ActiveCfg = Debug|Any CPU
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{5FAF63F8-89C3-4EEE-A3A0-DCB365CA69B6}.Debug|x86.Build.0 = Debug|Any CPU
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{5FAF63F8-89C3-4EEE-A3A0-DCB365CA69B6}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{5FAF63F8-89C3-4EEE-A3A0-DCB365CA69B6}.Release|Any CPU.Build.0 = Release|Any CPU
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{5FAF63F8-89C3-4EEE-A3A0-DCB365CA69B6}.Release|x64.ActiveCfg = Release|Any CPU
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{5FAF63F8-89C3-4EEE-A3A0-DCB365CA69B6}.Release|x64.Build.0 = Release|Any CPU
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{5FAF63F8-89C3-4EEE-A3A0-DCB365CA69B6}.Release|x86.ActiveCfg = Release|Any CPU
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{5FAF63F8-89C3-4EEE-A3A0-DCB365CA69B6}.Release|x86.Build.0 = Release|Any CPU
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{4B09EE23-0672-4FE0-8078-430028A5351E}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{4B09EE23-0672-4FE0-8078-430028A5351E}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{4B09EE23-0672-4FE0-8078-430028A5351E}.Debug|x64.ActiveCfg = Debug|Any CPU
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{4B09EE23-0672-4FE0-8078-430028A5351E}.Debug|x64.Build.0 = Debug|Any CPU
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{4B09EE23-0672-4FE0-8078-430028A5351E}.Debug|x86.ActiveCfg = Debug|Any CPU
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{4B09EE23-0672-4FE0-8078-430028A5351E}.Debug|x86.Build.0 = Debug|Any CPU
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{4B09EE23-0672-4FE0-8078-430028A5351E}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{4B09EE23-0672-4FE0-8078-430028A5351E}.Release|Any CPU.Build.0 = Release|Any CPU
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{4B09EE23-0672-4FE0-8078-430028A5351E}.Release|x64.ActiveCfg = Release|Any CPU
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{4B09EE23-0672-4FE0-8078-430028A5351E}.Release|x64.Build.0 = Release|Any CPU
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{4B09EE23-0672-4FE0-8078-430028A5351E}.Release|x86.ActiveCfg = Release|Any CPU
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{4B09EE23-0672-4FE0-8078-430028A5351E}.Release|x86.Build.0 = Release|Any CPU
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE
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EndGlobalSection
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EndGlobal

‎csharp-architectural-patterns/VerticalSliceArchitecture/EventTicketing/Data/TicketingDbContext.cs‎

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using EventTicketing.Domain;
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using Microsoft.EntityFrameworkCore;
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namespace EventTicketing.Data;
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public sealed class TicketingDbContext(DbContextOptions<TicketingDbContext> options)
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: DbContext(options)
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{
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public DbSet<Event> Events => Set<Event>();
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protected override void OnModelCreating(ModelBuilder modelBuilder)
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{
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modelBuilder.Entity<Event>(builder =>
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{
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builder.Property(e => e.Name).HasMaxLength(200);
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builder.HasData(
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new { Id = 1, Name = "Vertical Slice Live", Capacity = 100, TicketsSold = 0 },
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new { Id = 2, Name = "Tiny Jazz Club Night", Capacity = 2, TicketsSold = 0 });
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});
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}
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}

‎csharp-architectural-patterns/VerticalSliceArchitecture/EventTicketing/Domain/Event.cs‎

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namespace EventTicketing.Domain;
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public sealed class Event
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{
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private Event(string name, int capacity)
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{
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Name = name;
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Capacity = capacity;
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}
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public int Id { get; private set; }
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public string Name { get; private set; }
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public int Capacity { get; private set; }
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public int TicketsSold { get; private set; }
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public int TicketsLeft => Capacity - TicketsSold;
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public static Event Create(string name, int capacity)
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{
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ArgumentException.ThrowIfNullOrWhiteSpace(name);
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ArgumentOutOfRangeException.ThrowIfNegativeOrZero(capacity);
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return new Event(name, capacity);
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}
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public Result Reserve(int quantity)
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{
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ArgumentOutOfRangeException.ThrowIfNegativeOrZero(quantity);
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if (quantity > TicketsLeft)
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return EventErrors.SoldOut(TicketsLeft, quantity);
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TicketsSold += quantity;
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return Result.Success();
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}
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}

‎csharp-architectural-patterns/VerticalSliceArchitecture/EventTicketing/Domain/EventErrors.cs‎

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namespace EventTicketing.Domain;
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public static class EventErrors
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{
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public static Error NotFound(int eventId) =>
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new("Event.NotFound", $"Event {eventId} was not found.", ErrorType.NotFound);
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public static Error SoldOut(int ticketsLeft, int requested) =>
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new("Event.SoldOut", $"Only {ticketsLeft} tickets left, {requested} requested.", ErrorType.Conflict);
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}

‎csharp-architectural-patterns/VerticalSliceArchitecture/EventTicketing/Domain/Result.cs‎

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namespace EventTicketing.Domain;
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public enum ErrorType
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{
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NotFound,
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Conflict
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}
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public sealed record Error(string Code, string Description, ErrorType Type);
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public class Result
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{
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protected Result(Error? error) => Error = error;
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public Error? Error { get; }
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public bool IsSuccess => Error is null;
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public static Result Success() => new(null);
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public static implicit operator Result(Error error) => new(error);
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}
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public sealed class Result<TValue> : Result
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{
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private readonly TValue? _value;
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private Result(TValue? value, Error? error)
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: base(error) => _value = value;
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public TValue Value => IsSuccess
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? _value!
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: throw new InvalidOperationException("A failed result has no value.");
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public static implicit operator Result<TValue>(TValue value) =>
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new(value, null);
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public static implicit operator Result<TValue>(Error error) =>
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new(default, error);
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}

‎csharp-architectural-patterns/VerticalSliceArchitecture/EventTicketing/EventTicketing.csproj‎

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<Project Sdk="Microsoft.NET.Sdk.Web">
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<PropertyGroup>
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<TargetFramework>net10.0</TargetFramework>
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<Nullable>enable</Nullable>
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<ImplicitUsings>enable</ImplicitUsings>
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</PropertyGroup>
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<ItemGroup>
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<PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="10.0.12" />
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</ItemGroup>
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</Project>

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