"natural sorting linq" Code Answer's

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natural sorting linq

Quaint Quelea on Dec 10, 2020

    public class NaturalSortComparer<T> : IComparer<string>, IDisposable
    {
        private bool isAscending;

        public NaturalSortComparer(bool inAscendingOrder = true)
        {
            this.isAscending = inAscendingOrder;
        }

        #region IComparer<string> Members

        public int Compare(string x, string y)
        {
            throw new NotImplementedException();
        }

        #endregion

        #region IComparer<string> Members

        int IComparer<string>.Compare(string x, string y)
        {
            if (x == y)
                return 0;

            string[] x1, y1;

            if (!table.TryGetValue(x, out x1))
            {
                x1 = Regex.Split(x.Replace(" ", ""), "([0-9]+)");
                table.Add(x, x1);
            }

            if (!table.TryGetValue(y, out y1))
            {
                y1 = Regex.Split(y.Replace(" ", ""), "([0-9]+)");
                table.Add(y, y1);
            }

            int returnVal = 0;

            for (int i = 0; i < x1.Length && i < y1.Length; i++)
            {
                if (x1[i] != y1[i])
                {
                    returnVal = PartCompare(x1[i], y1[i]);
                    return isAscending ? returnVal : -returnVal;
                }
            }

            if (y1.Length > x1.Length)
            {
                returnVal = 1;
            }
            else if (x1.Length > y1.Length)
            { 
                returnVal = -1; 
            }
            else
            {
                returnVal = 0;
            }

            return isAscending ? returnVal : -returnVal;
        }

        private static int PartCompare(string left, string right)
        {
            int x, y;
            if (!int.TryParse(left, out x))
                return left.CompareTo(right);

            if (!int.TryParse(right, out y))
                return left.CompareTo(right);

            return x.CompareTo(y);
        }

        #endregion

        private Dictionary<string, string[]> table = new Dictionary<string, string[]>();

        public void Dispose()
        {
            table.Clear();
            table = null;
        }
    }

'Example: List<Photo> photos = DataManager.MainContext.Photos
'     .Where(item => item.PhotoFilename != null)
'     .AsEnumerable() !Important
'     .OrderBy(item => item.PhotoFilename, new NaturalSortComparer<string>())
'     .ToList();

Source: zootfroot.blogspot.com

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"natural sorting linq" Code Answer's