<PackageReference Include="Newtonsoft.Json" Version="13.0.3" />

IGrouping<TKey, TElement>

interface IGrouping<TKey, TElement> : IEnumerable<TElement>, IEnumerable
Represents a collection of objects that have a common key.
using System.Collections; using System.Collections.Generic; namespace Newtonsoft.Json.Utilities.LinqBridge { internal interface IGrouping<TKey, TElement> : IEnumerable<TElement>, IEnumerable { TKey Key { get; } } }