System.Collections.Generic.IReadOnlyList<T> public interface IReadOnlyList<T> : IEnumerable<T>, IEnumerable, IReadOnlyCollection<T> Documentation Code namespace System.Collections.Generic { public interface IReadOnlyList<out T> : IEnumerable<T>, IEnumerable, IReadOnlyCollection<T> { T this[int index] { get; } } }