DictionaryKeyCollectionDebugView.cs

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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;
    }
}