using System.Diagnostics; namespace System.Collections.Generic { internal sealed class DictionaryKeyCollectionDebugView<TKey, TValue> { private readonly ICollection<TKey> _collection; [DebuggerBrowsable(DebuggerBrowsableState.RootHidden)] public TKey[] Items { get { TKey[] array = new TKey[_collection.Count]; _collection.CopyTo(array, 0); return array; } } public DictionaryKeyCollectionDebugView(ICollection<TKey> collection) { if (collection == null) throw new ArgumentNullException("collection"); _collection = collection; } } }