XAML-Map-Control/MapControl/Shared/WmtsTileMatrixSet.cs

using System;
using System.Collections.Generic;
using System.Linq;

namespace MapControl
{
    public class WmtsTileMatrixSet
    {
        public WmtsTileMatrixSet(string identifier, string supportedCrs, IEnumerable<WmtsTileMatrix> tileMatrixes)
        {
            if (string.IsNullOrEmpty(supportedCrs))
            {
                throw new ArgumentException($"The {nameof(supportedCrs)} argument must not be null or empty.", nameof(supportedCrs));
            }

            if (tileMatrixes == null || !tileMatrixes.Any())
            {
                throw new ArgumentException($"The {nameof(tileMatrixes)} argument must not be null or an empty collection.", nameof(tileMatrixes));
            }

            Identifier = identifier;
            SupportedCrs = supportedCrs;
            TileMatrixes = tileMatrixes.OrderBy(m => m.Scale).ToList();
        }

        public string Identifier { get; }
        public string SupportedCrs { get; }
        public IList<WmtsTileMatrix> TileMatrixes { get; }
    }
}