IntuitiveSortComparer.cs

using Gsemac.Win32.Native;
using System.Collections;
using System.Collections.Generic;
using System.IO;

namespace Gsemac.Win32 {

    /// <summary>
    /// Sorts strings (i.e. file names) according to the "Intuitive or Numerical" sorting method used by Windows Explorer using <see cref="ShlwApi.StrCmpLogicalW"/>.
    /// </summary>
    public class IntuitiveSortComparer :
        IComparer,
        IComparer<string>,
        IComparer<FileInfo> {

        public int Compare(string x, string y) {

            x = x ?? "";
            y = y ?? "";

            return ShlwApi.StrCmpLogicalW(x, y);

        }
        public int Compare(FileInfo x, FileInfo y) {

            return Compare(x.FullName, y.FullName);

        }
        public int Compare(object x, object y) {

            if (x is FileInfo fileInfoX && y is FileInfo fileInfoY)
                return Compare(fileInfoX, fileInfoY);

            return Compare(x.ToString(), y.ToString());

        }

    }

}