CollectionDebugView.cs

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