csharp-pro

Use ReadOnlySpan<char> for zero-allocation string parsing and rent buffers from ArrayPool<byte>.Shared for batch stream processing. Always return rented buffers in a finally block to avoid pool exhaustion.

Use System.Threading.Channels with Channel.CreateBounded to build a thread-safe queue. Configure BoundedChannelOptions with FullMode, SingleReader, and SingleWriter settings, then expose WriteAsync and ReadAllAsync for producers and consumers.

Primary constructors let you declare constructor parameters directly on the class or record declaration, enabling concise dependency injection and immutable type definitions. They work with records, classes, and structs in C# 12 and later.

Calling .Result or .Wait() on a Task blocks the thread and can starve the thread pool or deadlock when continuations need the blocked context. The fix is to use await end-to-end and never block on asynchronous code.

Always use async Task except for event handlers, which require async void. Exceptions in async void methods cannot be caught by callers and crash the process, while async Task allows proper exception propagation and awaiting.

Avoid allocating byte arrays larger than 85,000 bytes repeatedly, since they go to the LOH and cause fragmentation. Rent buffers from ArrayPool<byte>.Shared or use RecyclableMemoryStream for large stream operations.