csharp

A set of C# and .NET coding rules covering names, asynchronous methods, cancellation, and error handling.

In plain words
What is it for?
Use it when writing or reviewing C#/.NET classes, interfaces, methods, properties, constants, enumerations, and asynchronous code.
Why use it?
It keeps code consistent and records conventions that might otherwise be applied differently by each developer or coding agent.

Cursor rule for Cursor

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add rules/mywand/cusrsor-do-it/csharp
Clone the repo
git clone --depth 1 https://github.com/mywand/cusrsor-do-it

Made for: Cursor.

Per session 0 Nothing until a file matches its globs; then the whole rule loads.
When invoked 2,671 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00000 $0.02671
Opus 5 $0.00000 $0.01336
Sonnet 5 $0.00000 $0.00534
Haiku 4.5 $0.00000 $0.00267

Measured yesterday against content hash 03649b5ac7b3, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

csharp scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.cursor/rules/languages/csharp.mdc · 427 lines

How it starts

The opening of the file, as written. The whole thing — 427 lines — stays where its author put it; the contents beside it link to each section on GitHub.

最近更新: 2025-10-10

C#/.NET 专属实践规范

1. 命名规范

1.1 类和接口

// 类名使用 PascalCase
public class UserService { }

// 接口以 I 开头
public interface IUserRepository { }

// 抽象类可以 Abstract 开头或结尾
public abstract class AbstractUserService { }

1.2 方法和属性

// 方法名使用 PascalCase
public async Task<User> GetUserByIdAsync(int userId) { }

// 属性使用 PascalCase
public string UserName { get; set; }

// 私有字段使用 camelCase 或 _camelCase
private readonly ILogger _logger;
private string userName;

1.3 常量和枚举

// 常量使用 PascalCase
public const int MaxRetryCount = 3;

// 枚举使用 PascalCase
public enum UserStatus
{
    Active,
    Inactive,
    Suspended
}

2. 异步编程

2.1 异步方法规范

// 异步方法以 Async 结尾
public async Task<string> GetDataAsync()
{
    // 使用 ConfigureAwait(false) 避免死锁
    var result = await httpClient.GetStringAsync(url).ConfigureAwait(false);
    return result;
}

// 避免 async void,除了事件处理器
public async void Button_Click(object sender, EventArgs e) // 仅限事件处理
{
    await ProcessAsync();
}

2.2 取消令牌

public async Task<User> GetUserAsync(int id, CancellationToken cancellationToken = default)
{
    return await repository.GetByIdAsync(id, cancellationToken);
}

3. 错误处理

3.1 异常处理

// 使用具体的异常类型
public User GetUser(int id)
{
    if (id <= 0)
        throw new ArgumentException("用户ID必须大于0", nameof(id));
    
    var user = repository.GetById(id);
    if (user == null)
        throw new UserNotFoundException($"未找到ID为{id}的用户");
    
    return user;
}

3.2 使用 Result 模式

public class Result<T>
{
    public bool IsSuccess { get; }
    public T Value { get; }
    public string Error { get; }
    
    private Result(bool isSuccess, T value, string error)
    {
        IsSuccess = isSuccess;
        Value = value;
        Error = error;
    }
    
    public static Result<T> Success(T value) => new(true, value, null);
    public static Result<T> Failure(string error) => new(false, default, error);
}

Read the full file on GitHub · 427 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. yesterday First seen · 427 lines · 0 tokens per session scan A 03649b5ac7b3

Subscribe to this mod's changes

csharp is a cursor rule published in the GitHub repository mywand/cusrsor-do-it (2 stars, last pushed 7mo ago), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 2,671 tokens. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.