Skill

csharp-patterns

C# 14 / .NET 10 patterns — primary constructors, collection expressions, pattern matching, records, required members, nullable reference types, file-scoped namespaces, sealed classes, naming conventions. USE FOR: writing modern C# code, applying .NET 10 language features, enforcing naming and style conventions. DO NOT USE FOR: concurrency (use csharp-concurrency-patterns) or EF Core entities (use efcore-patterns).

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```csharp

SKILL.md

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csharp-patterns

C# 14 / .NET 10 Patterns

Sprachfeatures (immer verwenden)

Primary Constructors

// ✅ Gut public class UserService(IUserRepository repository, ILogger<UserService> logger); // ❌ Vermeiden public class UserService { private readonly IUserRepository _repository; public UserService(IUserRepository repository) => _repository = repository; }

Collection Expressions

int[] numbers = [1, 2, 3]; List<string> names = ["Alice", "Bob"]; ReadOnlySpan<byte> bytes = [0x00, 0xFF];

Pattern Matching

var result = status switch { HttpStatusCode.OK => HandleSuccess(), HttpStatusCode.NotFound => HandleNotFound(), >= HttpStatusCode.InternalServerError => HandleServerError(), _ => HandleUnexpected() };

Records für DTOs

public record CreateUserRequest(string Email, string DisplayName); public record UserResponse(Guid Id, string Email, string DisplayName, DateTime CreatedAt);

Required Members

public class Configuration { public required string ConnectionString { get; init; } public required int MaxRetries { get; init; } }

Naming Conventions

Element

Convention

Beispiel

Klasse/Record

PascalCase

UserService

Interface

IPascalCase

IUserRepository

Methode

PascalCase

GetUserByIdAsync

Property

PascalCase

DisplayName

Parameter

camelCase

userId

Lokale Variable

camelCase

currentUser

Private Field

_camelCase

_repository

Konstante

PascalCase

MaxRetryCount

Async Methode

Suffix Async

CreateUserAsync

Pflicht-Patterns

File-scoped Namespaces immer

Nullable Reference Types immer aktiviert

Global Usings in GlobalUsings.cs

Sealed Classes als Default

Keine async void — nur async Task

Keine Magic Strings — Constants oder Enums

C# 14 / .NET 10 Patterns

Sprachfeatures (immer verwenden)

Primary Constructors

// ✅ Gut
public class UserService(IUserRepository repository, ILogger<UserService> logger);

// ❌ Vermeiden
public class UserService
{
    private readonly IUserRepository _repository;
    public UserService(IUserRepository repository) => _repository = repository;
}

Collection Expressions

int[] numbers = [1, 2, 3];
List<string> names = ["Alice", "Bob"];
ReadOnlySpan<byte> bytes = [0x00, 0xFF];

Pattern Matching

var result = status switch
{
    HttpStatusCode.OK => HandleSuccess(),
    HttpStatusCode.NotFound => HandleNotFound(),
    >= HttpStatusCode.InternalServerError => HandleServerError(),
    _ => HandleUnexpected()
};

Records für DTOs

public record CreateUserRequest(string Email, string DisplayName);
public record UserResponse(Guid Id, string Email, string DisplayName, DateTime CreatedAt);

Required Members

public class Configuration
{
    public required string ConnectionString { get; init; }
    public required int MaxRetries { get; init; }
}

Naming Conventions

Element	Convention	Beispiel
Klasse/Record	PascalCase	`UserService`
Interface	IPascalCase	`IUserRepository`
Methode	PascalCase	`GetUserByIdAsync`
Property	PascalCase	`DisplayName`
Parameter	camelCase	`userId`
Lokale Variable	camelCase	`currentUser`
Private Field	_camelCase	`_repository`
Konstante	PascalCase	`MaxRetryCount`
Async Methode	Suffix `Async`	`CreateUserAsync`

Pflicht-Patterns

File-scoped Namespaces immer
Nullable Reference Types immer aktiviert
Global Usings in GlobalUsings.cs
Sealed Classes als Default
Keine async void — nur async Task
Keine Magic Strings — Constants oder Enums