Orchard/src/Orchard.Web/Modules/Orchard.Modules/Models/DoghouseComparer.cs

using System;
using System.Collections.Generic;

namespace Orchard.Modules.Models {
    public class DoghouseComparer : IComparer<string> {
        private readonly string _theDog;

        public DoghouseComparer(string theDog) {
            _theDog = theDog;
        }

        public int Compare(string x, string y) {
            if (x == null || y == null)
                return x == null && y == null ? 0 : (x == null ? -1 : 1);

            if (string.Equals(x, y, StringComparison.OrdinalIgnoreCase))
                return 0;

            if (string.Equals(x, _theDog, StringComparison.OrdinalIgnoreCase))
                return 1;
            if (string.Equals(y, _theDog, StringComparison.OrdinalIgnoreCase))
                return -1;

            return string.Compare(x, y, StringComparison.OrdinalIgnoreCase);
        }
    }
}