Dotnet Csharp
Baseline C# skill loaded for every .NET code path. Guides language patterns (records, pattern matching, primary constructors, C# 8-15), coding standards, async/await, DI, LINQ, serialization, domain modeling, concurrency, Roslyn analyzers, globalization, native interop (P/Invoke, LibraryImport, ComWrappers), WASM interop (JSImport/JSExport), and type design. Spans 25 topics. Do not use for ASP.NET endpoint architecture, UI framework patterns, or CI/CD guidance.
Specification
- Skill ID
- novotnyllc/dotnet-artisan/dotnet-csharp
- Publisher
- novotnyllc
- Repository
- dotnet-artisan
- Installs
- 0
- Files
- 27
- License
- MIT
- Synced
- Sep 23, 2026
How to use it
Open any RiverX project, open the Skills panel in the chat, and search for this identifier. The files are fetched from the source repository at install time.
novotnyllc/dotnet-artisan/dotnet-csharpInstalls these files- SKILL.md
- agents/openai.yaml
- references/api-design.md
- references/async-patterns.md
- references/channels.md
- references/code-smells.md
- references/coding-standards.md
- references/concurrency-patterns.md
- references/configuration.md
- references/dependency-injection.md
- references/domain-modeling.md
- references/dotnet-releases.md
- references/editorconfig.md
- references/file-io.md
- references/globalization.md
- references/input-validation.md
- references/linq-optimization.md
- references/modern-patterns.md
- references/native-interop.md
- references/nullable-reference-types.md
- references/roslyn-analyzers.md
- references/serialization.md
- references/solid-principles.md
- references/source-generators.md
- references/type-design-performance.md
- references/validation-patterns.md
- references/wasm-interop.md
What this skill tells the agent
dotnet-csharp
Overview
C# language patterns, coding standards, and .NET runtime features for idiomatic, performant code. This consolidated skill spans 25 topic areas. Load the appropriate companion file from references/ based on the routing table below.
Always-Load Baseline
These references define correctness and quality standards that apply to all C# code — load them by default whenever producing or reviewing code, regardless of what the user asked for:
references/coding-standards.md— naming conventions, file layout, style rulesreferences/async-patterns.md— async/await correctness, ConfigureAwait, cancellation propagation (nearly all .NET code uses async)references/solid-principles.md— SOLID, DRY, single responsibility, dependency inversion, anti-pattern detectionreferences/code-smells.md— common mistakes the agent should avoid without being told (async void, DI lifetime misuse, swallowed exceptions)references/dotnet-releases.md— .NET 10/11 and C# 14/15 features, version matrix, TFM-specific code generation rules (compensates for training data cutoff)
On-Demand References
Load these when the topic matches (see Routing Table keywords):
Routing Table
| Topic | Keywords | Description | Companion File |
|---|---|---|---|
| Coding standards | naming, file layout, style rules | Baseline C# conventions (naming, layout, style rules) | references/coding-standards.md |
| Async/await | async, Task, ConfigureAwait, cancellation | async/await, Task patterns, ConfigureAwait, cancellation | references/async-patterns.md |
| Dependency injection | DI, services, scopes, keyed, lifetimes | MS DI, keyed services, scopes, decoration, lifetimes | references/dependency-injection.md |
| Configuration | Options pattern, user secrets, feature flags | Options pattern, user secrets, feature flags, IOptions\<T\> | references/configuration.md |
| Source generators | IIncrementalGenerator, GeneratedRegex, LoggerMessage | IIncrementalGenerator, GeneratedRegex, LoggerMessage, STJ | references/source-generators.md |
| Nullable reference types | annotations, migration, agent mistakes | Annotation strategies, migration, agent mistakes | references/nullable-reference-types.md |
| Serialization | System.Text.Json, Protobuf, MessagePack, AOT | System.Text.Json source generators, Protobuf, MessagePack | references/serialization.md |
| Channels | Channel\<T\>, bounded/unbounded, backpressure | Channel\<T\>, bounded/unbounded, backpressure, drain | references/channels.md |
| LINQ optimization | IQueryable vs IEnumerable, compiled queries | IQueryable vs IEnumerable, compiled queries, allocations | references/linq-optimization.md |
| Domain modeling | aggregates, value objects, domain events | Aggregates, value objects, domain events, repositories | references/domain-modeling.md |
| SOLID principles | SRP, DRY, anti-patterns, compliance checks | SOLID and DRY principles, C# anti-patterns, fixes | references/solid-principles.md |
| Concurrency | lock, SemaphoreSlim, Interlocked, concurrent collections | lock, SemaphoreSlim, Interlocked, concurrent collections | references/concurrency-patterns.md |
| Roslyn analyzers | DiagnosticAnalyzer, CodeFixProvider, multi-version | DiagnosticAnalyzer, CodeFixProvider, CodeRefactoring | references/roslyn-analyzers.md |
| Editorconfig | IDE/CA severity, AnalysisLevel, globalconfig | IDE/CA severity, AnalysisLevel, globalconfig, enforcement | references/editorconfig.md |
| File I/O | FileStream, RandomAccess, FileSystemWatcher, paths | FileStream, RandomAccess, FileSystemWatcher, MemoryMappedFile | references/file-io.md |
| Native interop | P/Invoke, LibraryImport, ComWrappers, marshalling | P/Invoke, LibraryImport, ComWrappers, marshalling, cross-platform | references/native-interop.md |
| Input validation | .NET 10 AddValidation, FluentValidation | .NET 10 AddValidation, FluentValidation, ProblemDetails | references/input-validation.md |
| Validation patterns | DataAnnotations, IValidatableObject, IValidateOptions | DataAnnotations, IValidatableObject, IValidateOptions\<T\> | references/validation-patterns.md |
| Modern patterns | records, pattern matching, primary constructors | Records, pattern matching, primary constructors, C# 12-15 | references/modern-patterns.md |
| API design | naming, parameter ordering, return types, extensions | Naming, parameter ordering, return types, error patterns | references/api-design.md |
| Type design/perf | struct vs class, sealed, Span/Memory, collections | struct vs class, sealed, Span/Memory, collections | references/type-design-performance.md |
| Code smells | anti-patterns, async misuse, DI mistakes, fixes | Anti-patterns, async misuse, DI mistakes, fixes | references/code-smells.md |
| .NET releases | .NET 10, .NET 11, C# 14, C# 15, TFM, version, union, extension blocks, field keyword | Version matrix, new features, TFM-specific code generation | references/dotnet-releases.md |
| Globalization | CultureInfo, StringComparison, TimeZoneInfo, Rune, encoding | Culture-aware coding, string comparison, time zones, character processing | references/globalization.md |
| WASM interop | JSImport, JSExport, standalone WASM, wasm-experimental, browser | JSImport/JSExport, standalone .NET WASM, browser APIs, WASM AOT | references/wasm-interop.md |
Scope
- C# language features (C# 8-15)
- .NET runtime patterns (async, DI, config, serialization, channels, LINQ)
- Code quality (analyzers, editorconfig, code smells, SOLID)
- Type design and domain modeling
- File I/O and native interop
- Globalization (string comparison, CultureInfo, time zones, character processing, encoding)
- Input validation at the model level (DataAnnotations, IValidatableObject, FluentValidation, Options validation)
Out of scope
- ASP.NET Core / web API patterns (request-level validation, endpoint filters) ->
dotnet-api - UI framework patterns ->
dotnet-ui - Testing patterns ->
dotnet-testing - Build/MSBuild/project setup ->
dotnet-tooling - Performance profiling tools ->
dotnet-tooling
Use this skill in a project
Open any RiverX project, search the Skills panel for novotnyllc/dotnet-artisan/dotnet-csharp, and install it in one click.