New posts in Readonly Collection

Why IReadOnlyCollection has ElementAt but not IndexOf

C# HashSet<T> read-only workaround

Converting Dictionary<TKey, List<TValue>> to ReadOnlyDictionary<TKey, ReadOnlyCollection<TValue>>

How to create an empty IReadOnlyCollection

Read-only list or unmodifiable list in .NET 4.0

ReadOnlyCollection or IEnumerable for exposing member collections?