Csharp Async

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.