csharp-patterns

# C# / .NET Patterns ## Project Structure ### Solution Layout ``` MyApp.sln Directory.Build.props # Shared build properties Directory.Packages.props # Central package management src/ MyApp.Api/ # ASP.NET Core host (Controllers, Middleware, Program.cs) MyApp.Application/ # Use cases, MediatR handlers, Behaviors MyApp.Domain/ # Entities, value objects, domain events MyApp.Infrastructure/ # EF Core, external services tests/ MyApp.UnitTests/ MyApp.IntegrationTests/ ``` ### Directory.Build.props ```xml <Project> <PropertyGroup> <TargetFramework>net9.0</TargetFramework> <Nullable>enable</Nullable> <ImplicitUsings>enable</ImplicitUsings> <TreatWarningsAsErrors>true</TreatWarningsAsErrors> <EnforceCodeStyleInBuild>true</EnforceCodeStyleInBuild> <AnalysisLevel>latest-recommended</AnalysisLevel> </PropertyGroup> </Project> ``` ### Central Package Management (Directory.Packages.props) ```xml <Project> <PropertyGroup> <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally> </PropertyGroup> <ItemGroup> <PackageVersion Include="MediatR" Version="12.4.1" /> <PackageVersion Include="FluentValidation" Version="11.11.0" /> <PackageVersion Include="Microsoft.EntityFrameworkCore" Version="9.0.0" /> </ItemGroup> </Project> ``` --- ## Idioms / Code Style ### Nullable Reference Types ```csharp public class Order { public re...