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csharp-async

Review C# asynchronous code and get suggestions for method names, return types, exception handling, concurrent tasks, and cancellation. Identify blocking calls and missing awaits, and choose patterns for long operations or sequences processed asynchronously.

한국어 요약은 준비 중입니다. 영어 요약을 표시하고 있습니다.

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Get best practices for C# async programming

github/awesome-copilot
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  • Reviewing async/await usage
  • Finding blocking calls and missing awaits
  • Planning concurrent tasks and cancellation
  • Designing asynchronous APIs and streams

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  • SKILL.md1.8 KB

SKILL.md(원문)

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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.

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