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csharp-async

Get best practices for C# async programming

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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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