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Day 05Sprint 1 ā¢ C# 12 Core
2 Hours
Day 5: Generics, Collections & Enterprise LINQ Masterclass
LINQ (Language Integrated Query) is one of the most powerful innovations in C#. It allows querying collections, databases (via EF Core), and XML using a unified, strongly typed syntax with compile-time verification.
Master Generic Collections: List<T>, Dictionary<TKey, TValue>, HashSet<T>
Understand C# LINQ (Language Integrated Query) method syntax and deferred execution
Execute complex filtering, sorting, projection (Select), grouping (GroupBy), and aggregation
Build an In-Memory Student Analytics & Grading Engine
Core Architectural Insights
- Generics prevent boxing/unboxing overhead and ensure type safety
- LINQ deferred execution: queries do not execute until enumerated (e.g. via ToList() or foreach)
- Where filters, Select projects, OrderBy sorts, and GroupBy categorizes data
- Any(), All(), and Count() provide lightning-fast aggregations
Real-World Developer Analogy
Think of LINQ as SQL queries running directly inside your C# memory. You don't need tedious for-loops; you express what data you want declaratively.