YUNOVA · C#

Module 12: Advanced C#

Notes for offline study · 3 November 2026

Advanced LINQ and IQueryable

Key points

  • IEnumerable runs LINQ in memory; IQueryable builds an expression tree.
  • IQueryable providers like EF Core translate queries to SQL.
  • Deferred execution means a query runs only when enumerated.

Task Parallel Library and parallel loops

Key points

  • The TPL runs work on the thread pool using Task objects.
  • Parallel.For and Parallel.ForEach split loop work across cores.
  • Shared data in parallel loops needs locks or thread-safe collections.

Reflection and attributes

Key points

  • Reflection reads types, methods and properties at runtime.
  • Attributes attach metadata to code elements.
  • GetCustomAttributes reads attributes, often in frameworks and serializers.

Span<T> and memory performance

Key points

  • Span<T> is a view over contiguous memory without copying it.
  • Slicing a span avoids new allocations for substrings or arrays.
  • Span is a ref struct, so it cannot be stored on the heap; Memory<T> can.