How does this skill help with C# anti-patterns?

It identifies and corrects common mistakes like using 'async void', calling '.Result' or '.Wait()' which cause deadlocks, and performing unnecessary async/await wrapping.

When should I use ValueTask instead of Task?

Use ValueTask when an operation is likely to complete synchronously (such as returning a cached value) to avoid the heap allocation associated with a standard Task object.

Can I await a ValueTask more than once?

No, a ValueTask should only be awaited once. Awaiting it multiple times can lead to undefined behavior or errors depending on the underlying implementation.

Why is ConfigureAwait(false) recommended in .NET libraries?

It prevents the task from attempting to marshal back to the original synchronization context, which is critical for preventing deadlocks in UI-based or ASP.NET applications.

How do I handle multiple async tasks concurrently with throttling?

This skill demonstrates using SemaphoreSlim to limit the number of concurrent asynchronous operations, ensuring you don't overwhelm system resources or external APIs.

.NET Async Operations Expert

Name: .NET Async Operations Expert
Author: christian289

bychristian289

•

API Development

Implements efficient asynchronous programming patterns in .NET using Task, ValueTask, and CancellationToken to improve application performance.

About

This skill equips Claude with specialized knowledge for handling .NET asynchronous programming, focusing on building high-performance, non-blocking applications. It provides expert guidance on choosing between Task and ValueTask to optimize memory allocation, implementing IAsyncEnumerable for streaming data, and managing complex concurrency with SemaphoreSlim. By adhering to modern C# best practices like ConfigureAwait(false) and robust cancellation token management, this skill helps developers avoid common pitfalls such as deadlocks and unnecessary thread blocking, ensuring scalable and responsive software architecture.

Key Features

Deadlock prevention using ConfigureAwait patterns in library code
Implementation of IAsyncEnumerable for efficient async data streaming
6 GitHub stars
Concurrency control and throttling with SemaphoreSlim for I/O operations
Comprehensive cancellation management using CancellationTokenSource
Optimization with ValueTask for high-frequency synchronous completions

Use Cases

Optimizing high-throughput APIs to reduce heap allocations and GC pressure
Building responsive desktop or web applications through proper I/O offloading
Refactoring synchronous legacy code into modern non-blocking asynchronous patterns

About

Key Features

Deadlock prevention using ConfigureAwait patterns in library code
Implementation of IAsyncEnumerable for efficient async data streaming
6 GitHub stars
Concurrency control and throttling with SemaphoreSlim for I/O operations
Comprehensive cancellation management using CancellationTokenSource
Optimization with ValueTask for high-frequency synchronous completions

Use Cases

Optimizing high-throughput APIs to reduce heap allocations and GC pressure
Building responsive desktop or web applications through proper I/O offloading
Refactoring synchronous legacy code into modern non-blocking asynchronous patterns