namespace System.Collections.Generic
{
    [DefaultMember("Item")]
    public class OrderedDictionary<TKey, TValue> : ICollection<KeyValuePair<TKey, TValue>>, IDictionary<TKey, TValue>, IEnumerable, IEnumerable<KeyValuePair<TKey, TValue>>, IList<KeyValuePair<TKey, TValue>>, IReadOnlyCollection<KeyValuePair<TKey, TValue>>, IReadOnlyDictionary<TKey, TValue>, IReadOnlyList<KeyValuePair<TKey, TValue>>, ICollection, IDictionary, IList
        where TKey, notnull
    {
        public int EnsureCapacity(int capacity);
    }
}