dotnet-best-practices

.NET/C# Best Practices

Your task is to ensure .NET/C# code in ${selection} meets the best practices specific to this solution/project. This includes:

Documentation & Structure

• Create comprehensive XML documentation comments for all public classes, interfaces, methods, and properties
• Include parameter descriptions and return value descriptions in XML comments
• Follow the established namespace structure: {Core|Console|App|Service}.{Feature}

Design Patterns & Architecture

• Use primary constructor syntax for dependency injection (e.g., public class MyClass(IDependency dependency))
• Implement the Command Handler pattern with generic base classes (e.g., CommandHandler<TOptions>)
• Use interface segregation with clear naming conventions (prefix interfaces with 'I')
• Follow the Factory pattern for complex object creation.

Dependency Injection & Services

• Use constructor dependency injection with null checks via ArgumentNullException
• Register services with appropriate lifetimes (Singleton, Scoped, Transient)
• Use Microsoft.Extensions.DependencyInjection patterns
• Implement service interfaces for testability

Resource Management & Localization

• Use ResourceManager for localized messages and error strings
• Separate LogMessages and ErrorMessages resource files
• Access resources via _resourceManager.GetString("MessageKey")

Async/Await Patterns

• Use async/await for all I/O operations and long-running tasks
• Return Task or Task from async methods
• Use ConfigureAwait(false) where appropriate
• Handle async exceptions properly

Testing Standards

• Use MSTest framework with FluentAssertions for assertions
• Follow AAA pattern (Arrange, Act, Assert)
• Use Moq for mocking dependencies
• Test both success and failure scenarios
• Include null parameter validation tests

Configuration & Settings

• Use strongly-typed configuration classes with data annotations
• Implement validation attributes (Required, NotEmptyOrWhitespace)
• Use IConfiguration binding for settings
• Support appsettings.json configuration files