Mastering C# Collections: IEnumerable vs ICollection vs IList for Clean, Efficient Code
C# Collections: IEnumerable vs ICollection vs IList When working with collections in C# , understanding the distinctions between IEnumerable<T> , ICollection<T> , and IList<T> is essential for writing scalable, maintainable, and performant applications. 1️⃣ IEnumerable<T>: Best for Iteration & Querying Ideal Use Cases: Lazy evaluation for handling large datasets efficiently. Read-only access without modifying the collection. Supports LINQ queries for filtering and transformation. Example: using System.Collections.Generic; IEnumerable<int> numbers = new List<int> { 1, 2, 3, 4, 5 }; foreach (var number in numbers) { Console.WriteLine(number); // Iterating forward only } 2️⃣ ICollection<T>: Supports Modification & Sizing Ideal Use Cases: Adding, removing, and clearing elements. Maintaining a Count property for efficient sizing. General data mana...