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AdhamxonAdhamxon/claude-code-skills/.claude/skills/copilot-csharp-async/SKILL.md

csharp-async

Skill2 starsChanged 3 months agoMITView on GitHub

Get best practices for C# async programming

We split this skill into the rules it gives an agent

17 rules. About 0 are common, 11 are distinctive, and 6 are very specific to this project.

  • ≈0

    Common · estimate

    Many files like this have a rule of this kind.

  • ≈11

    Distinctive · estimate

    This author's own choices. Worth a look.

  • 6

    Very specific

    Tied to their project's names, files or tools. Probably skip.

  • Common
  • Distinctive
  • Very specific
  1. Distinctive:

    Use the 'Async' suffix for all async methods

    line 12
  2. Very specific:

    Consider ValueTask<T> for high-performance scenarios to reduce allocations

    line 19
  3. Very specific:

    Avoid returning void for async methods except for event handlers

    line 20
  4. Distinctive:

    Use try/catch blocks around await expressions

    line 24
  5. Distinctive:

    Avoid swallowing exceptions in async methods

    line 25
  6. Very specific:

    Use ConfigureAwait(false) when appropriate to prevent deadlocks in library code

    line 26
  7. Very specific:

    Use Task.WhenAll() for parallel execution of multiple tasks

    line 31
  8. Very specific:

    Use Task.WhenAny() for implementing timeouts or taking the first completed task

    line 32
  9. Distinctive:

    Avoid unnecessary async/await when simply passing through task results

    line 33
  10. Distinctive:

    Consider cancellation tokens for long-running operations

    line 34
  11. Very specific:

    Never use .Wait(), .Result, or .GetAwaiter().GetResult() in async code

    line 38
  12. Distinctive:

    Avoid mixing blocking and async code

    line 39
  13. Distinctive:

    Don't create async void methods (except for event handlers)

    line 40
  14. Distinctive:

    Always await Task-returning methods

    line 41
  15. Distinctive:

    Use async streams (IAsyncEnumerable<T>) for processing sequences asynchronously

    line 46
  16. Distinctive:

    Consider the task-based asynchronous pattern (TAP) for public APIs

    line 47
  17. Distinctive:

    When reviewing my C# code, identify these issues and suggest improvements that follow these best practices.

    line 49

≈ “Common” is an estimate: at least 1 in 5 of the 308,232 skill files we read have a rule of the same kind, not the same words. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.

Keep what fits and drop the rest. Your version, ready for your agents.
Files
SKILL.md

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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Trending

Surging: 1 new project took it in the last 4 weeks, none the 4 weeks before.thin data

Week of Aug 30: 0 new projectsWeek of Sep 6: 0 new projectsWeek of Sep 13: 0 new projectsWeek of Sep 20: 0 new projectsWeek of Sep 27: 0 new projectsWeek of Oct 4: 1 new projectWeek of Oct 11: 0 new projectsWeek of Oct 18: 0 new projects
Aug 2026Sep 2026Oct 2026
New projects taking a version of this file each week, over the 8 weeks our latest run read: only 1 in all, so this is a hint, not a trend.

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