GroupByGrouping.cs

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using System.Collections;
using System.Collections.Generic;
 
namespace System.Linq.Parallel;
 
internal sealed class GroupByGrouping<TGroupKey, TElement> : IGrouping<TGroupKey, TElement>, IEnumerable<TElement>, IEnumerable
{
    private readonly KeyValuePair<Wrapper<TGroupKey>, ListChunk<TElement>> _keyValues;
 
    TGroupKey IGrouping<TGroupKey, TElement>.Key => _keyValues.Key.Value;
 
    internal GroupByGrouping(KeyValuePair<Wrapper<TGroupKey>, ListChunk<TElement>> keyValues)
    {
        _keyValues = keyValues;
    }
 
    IEnumerator<TElement> IEnumerable<TElement>.GetEnumerator()
    {
        return _keyValues.Value.GetEnumerator();
    }
 
    IEnumerator IEnumerable.GetEnumerator()
    {
        return ((IEnumerable<TElement>)this).GetEnumerator();
    }
}