PairComparer.cs

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using System.Collections.Generic;
 
namespace System.Linq.Parallel;
 
internal sealed class PairComparer<T, U> : IComparer<Pair<T, U>>
{
    private readonly IComparer<T> _comparer1;
 
    private readonly IComparer<U> _comparer2;
 
    public PairComparer(IComparer<T> comparer1, IComparer<U> comparer2)
    {
        _comparer1 = comparer1;
        _comparer2 = comparer2;
    }
 
    public int Compare(Pair<T, U> x, Pair<T, U> y)
    {
        int num = _comparer1.Compare(x.First, y.First);
        if (num != 0)
        {
            return num;
        }
        if (_comparer2 == null)
        {
            return num;
        }
        return _comparer2.Compare(x.Second, y.Second);
    }
}