ICollectionDebugView.cs

// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using System.Diagnostics;

namespace System.Collections.Generic
{
    internal sealed class ICollectionDebugView<T>
    {
        private readonly ICollection<T> _collection;

        public ICollectionDebugView(ICollection<T> collection)
        {
            ArgumentNullException.ThrowIfNull(collection);

            _collection = collection;
        }

        [DebuggerBrowsable(DebuggerBrowsableState.RootHidden)]
        public T[] Items
        {
            get
            {
                T[] items = new T[_collection.Count];
                _collection.CopyTo(items, 0);
                return items;
            }
        }
    }
}