Claude Agent Skill · by Github

Csharp Async

A solid code reviewer for async C# that catches the stuff that actually matters. It'll flag when you're mixing .Wait() with async code, remind you about Configu

Install
Terminal · npx
$npx skills add https://github.com/github/awesome-copilot --skill csharp-async
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Source file
SKILL.md49 lines
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---name: csharp-asyncdescription: 'Get best practices for C# async programming'--- # C# Async Programming Best Practices Your goal is to help me follow best practices for asynchronous programming in C#. ## Naming Conventions - Use the 'Async' suffix for all async methods- Match method names with their synchronous counterparts when applicable (e.g., `GetDataAsync()` for `GetData()`) ## Return Types - Return `Task<T>` when the method returns a value- Return `Task` when the method doesn't return a value- Consider `ValueTask<T>` for high-performance scenarios to reduce allocations- Avoid returning `void` for async methods except for event handlers ## Exception Handling - Use try/catch blocks around await expressions- Avoid swallowing exceptions in async methods- Use `ConfigureAwait(false)` when appropriate to prevent deadlocks in library code- Propagate exceptions with `Task.FromException()` instead of throwing in async Task returning methods ## Performance - Use `Task.WhenAll()` for parallel execution of multiple tasks- Use `Task.WhenAny()` for implementing timeouts or taking the first completed task- Avoid unnecessary async/await when simply passing through task results- Consider cancellation tokens for long-running operations ## Common Pitfalls - Never use `.Wait()`, `.Result`, or `.GetAwaiter().GetResult()` in async code- Avoid mixing blocking and async code- Don't create async void methods (except for event handlers)- Always await Task-returning methods ## Implementation Patterns - Implement the async command pattern for long-running operations- Use async streams (IAsyncEnumerable<T>) for processing sequences asynchronously- Consider the task-based asynchronous pattern (TAP) for public APIs When reviewing my C# code, identify these issues and suggest improvements that follow these best practices.