namespace System.Collections.Generic
{
    [DebuggerDisplay("Count = {Count}")]
    [DebuggerTypeProxy(typeof(System_DictionaryDebugView<?, ?>))]
    [DefaultMember("Item")]
    public class SortedDictionary<TKey, TValue> : ICollection<KeyValuePair<TKey, TValue>>, IDictionary<TKey, TValue>, IEnumerable<KeyValuePair<TKey, TValue>>, ICollection, IDictionary, IEnumerable
    {
        [DebuggerDisplay("Count = {Count}")]
        [DebuggerTypeProxy(typeof(System_DictionaryKeyCollectionDebugView<?, ?>))]
        public sealed class KeyCollection : ICollection<TKey>, IEnumerable<TKey>, ICollection, IEnumerable
        {
            public struct Enumerator : IEnumerator, IEnumerator<TKey>, IDisposable
            {
                public bool MoveNext();
            }
        }
    }
}