ReadOnlyCollection<T> abstract class ReadOnlyCollection<T> : ICollection<T>, IEnumerable<T>, IEnumerable Documentation Code public abstract int Count { get; } public bool IsReadOnly { get; } protected ReadOnlyCollection() public void Add(T item) public void Clear() public abstract bool Contains(T item) public abstract void CopyTo(T[] array, int arrayIndex) public abstract IEnumerator<T> GetEnumerator() public bool Remove(T item)