C# · Expert

Lesson 1 · On the house

Span<T> and allocation-free slicing

Span, ReadOnlySpan, stackalloc, and slicing without copying.

Lesson 2

Channels and producer-consumer

System.Threading.Channels for async pipelines with bounded backpressure.

Lesson 3

Thread safety: lock, Interlocked, Parallel

Race conditions, lock, Interlocked atomics, ConcurrentDictionary, and Parallel.For.

Lesson 4

CancellationToken

Cooperative cancellation with CancellationTokenSource, timeouts, and linked tokens.

Lesson 5

IAsyncEnumerable and await foreach

Async streams with async iterators, WithCancellation, and LINQ-style processing.

Lesson 6

Reflection and attributes

Inspect types at runtime, read custom attributes, and invoke members dynamically.

Lesson 7

Expression trees

Expression<Func<...>> as data: inspect, build, and compile code at runtime.

Lesson 8

ref returns, in, and ref struct

Pass and return by reference to avoid copies of large structs safely.

Lesson 9

Operators, equality, and comparison

Overload operators, implement IEquatable<T> and IComparable<T>, and keep GetHashCode consistent.

Lesson 10

Generic math

Static abstract interface members and INumber<T> for one algorithm over all numeric types.