複数のプロパティを配列化する

    public class HoGE
    {
        public bool Param1 { get; set; }
        public bool Param2 { get; set; }
        public bool Param3 { get; set; }
        public bool Param4 { get; set; }
        public bool Param5 { get; set; }
        public bool Param6 { get; set; }
        public bool Param7 { get; set; }
        public bool Param8 { get; set; }
        public bool Param9 { get; set; }
        public bool Param10 { get; set; }
    }

    var hoge = new HoGE
            {
                Param1 = true,
                Param5 = true,
                Param9 = true,
            };

string[] h = Enumerable.Range(1, 10)
                    .Select(x =>
                    {
                        switch (x)
                        {
                            case 1: return hoge.Param1 ? nameof(hoge.Param1) : "";
                            case 2: return hoge.Param2 ? nameof(hoge.Param2) : "";
                            case 3: return hoge.Param3 ? nameof(hoge.Param3) : "";
                            case 4: return hoge.Param4 ? nameof(hoge.Param4) : "";
                            case 5: return hoge.Param5 ? nameof(hoge.Param5) : "";
                            case 6: return hoge.Param6 ? nameof(hoge.Param6) : "";
                            case 7: return hoge.Param7 ? nameof(hoge.Param7) : "";
                            case 8: return hoge.Param8 ? nameof(hoge.Param8) : "";
                            case 9: return hoge.Param9 ? nameof(hoge.Param9) : "";
                            case 10: return hoge.Param10 ? nameof(hoge.Param10) : "";
                            default: return "";
                        }
                    }).Where(x => x != "").ToArray();

string[] h = properties
                    .Where(pi => pi.Name.StartsWith("Param") && (bool)pi.GetValue(hoge))
                    .Select(pi => pi.Name)
                    .ToArray();