Writing
So You Think You Know C#? For vs. Foreach
The type a foreach loop sees determines its enumeration path. Array lowering, list enumerators and yield state machines explain the work behind the syntax.
Topic
Iterator Pattern
Traversing a sequence one item at a time through a stable iteration contract, with the consumer requesting each next item.
2 pages
Writing
C# 8 - Async Streams
Async streams let callers process database rows before the full result exists. An async iterator combines await and yield return, keeping its reader open during enumeration.