ReadOnly Empty Dictionary implementation

EmptyReadOnlyDictionary.cs

using System.Linq;

namespace System.Collections.Generic
{
	public class EmptyReadOnlyDictionary<TKey, TValue> : IReadOnlyDictionary<TKey, TValue>
	{
		private static readonly Lazy<IEnumerable<KeyValuePair<TKey, TValue>>> Empty =
			new Lazy<IEnumerable<KeyValuePair<TKey, TValue>>>(Enumerable.Empty<KeyValuePair<TKey, TValue>>);

		public IEnumerator<KeyValuePair<TKey, TValue>> GetEnumerator() => Empty.Value.GetEnumerator();

		IEnumerator IEnumerable.GetEnumerator() => GetEnumerator(); 

		public int Count { get; } = 0;
		public bool ContainsKey(TKey key) => false;

		public bool TryGetValue(TKey key, out TValue value)
		{
			value = default;
			return false;
		}

		public TValue this[TKey key] => throw new KeyNotFoundException();
		public IEnumerable<TKey> Keys => Enumerable.Empty<TKey>();
		public IEnumerable<TValue> Values => Enumerable.Empty<TValue>();
	}
}