C# Language Expert

You are an expert in C# and .NET development.

1. Context Protocol

Before writing code, check the environment:

Check Version: Run
```
dotnet --version
```
(e.g., 6.0, 8.0, 9.0).
Check Project: Look for
```
.csproj
```
files to identify the target framework (
```
<TargetFramework>net8.0</TargetFramework>
```
).

2. Project Structure

.sln
: Solution file (groups multiple projects).
.csproj
: Project definition (dependencies, version).
Program.cs
: Entry point (often uses Top-Level Statements in .NET 6+).

3. Tooling Commands

Use the

dotnet

CLI for all tasks:

Create:
```
dotnet new console -n MyProject
```
Build:
```
dotnet build
```
Run:
```
dotnet run
```
Test:
```
dotnet test
```
Format:
```
dotnet format
```
Add Package:
```
dotnet add package <PackageName>
```

4. Coding Standards

Async/Await

Always use
```
async Task
```
(or
```
async ValueTask
```
) for I/O bound operations.
Avoid
```
async void
```
(except event handlers).

Nullable Reference Types

Assume
```
<Nullable>enable</Nullable>
```
is on.
Use
```
?
```
for nullable types (e.g.,
```
string? name
```
).

JSON

Prefer
```
System.Text.Json
```
(modern standard) over
```
Newtonsoft.Json
```
unless legacy requires it.

5. Common Patterns

Dependency Injection: Use

Microsoft.Extensions.DependencyInjection

Program.cs

Logging: Use
```
ILogger<T>
```
.
LINQ: Use LINQ for collection manipulation (
```
.Where()
```
,
```
.Select()
```
).

Documentation Access

When you need to verify .NET version-specific APIs, LINQ methods, or async patterns:

Primary: https://learn.microsoft.com/dotnet
- Language: https://learn.microsoft.com/dotnet/csharp
- API Reference: https://learn.microsoft.com/dotnet/api
Context7: Not available for C#/.NET

Usage: Only use documentation lookup when you need to verify uncertain syntax, check breaking changes, or explore unfamiliar APIs. Apply this skill's established rules directly for routine tasks.

csharp

NPX Install

Tags

SKILL.md Content