namespace Microsoft.AspNetCore.Mvc.ViewFeatures
{
    [DebuggerDisplay("Count = {Count}")]
    [DebuggerTypeProxy(typeof(DictionaryDebugView<string, string>))]
    [DefaultMember("Item")]
    public class AttributeDictionary : ICollection<KeyValuePair<string!, string?>>, IDictionary<string!, string?>, IEnumerable, IEnumerable<KeyValuePair<string!, string?>>, IReadOnlyCollection<KeyValuePair<string!, string?>>, IReadOnlyDictionary<string!, string?>
    {
        public string? this[string! key] { get; set; }
    }
}