using System;

using System.Collections.Generic;

using System.Text.Json;

​

public class Program

{

    public enum FilterDataType

    {

        String,

        Number,

        Date,

        Boolean,

        Null,

        Filter

    }

    public class Thing {

        public FilterDataType DataType { get; set; }

    }

    public class Thing2 {

        private FilterDataType _dataType { get; set; }

        public string DataType

        {

            get => _dataType.ToString();

            set => _dataType = Enum.Parse<FilterDataType>(value);

        }

    }

    public class Thing3 {

        public static readonly HashSet<string> ValidDataTypes = new (){ "String", "Number", "Boolean", "Date", "Null", "Filter" };

        private string _dataType { get; set; }

        public string DataType

        {

            get => _dataType;

            set

            {

                if (ValidDataTypes.Contains(value))

                    _dataType = value;

                else

                    throw new Exception($"Invalid DataType: {value} is not a valid DataType.");

            }

        }

    }

    public static void Main()

    {

        var x = new Thing();

        x.DataType = FilterDataType.String;

        Console.WriteLine($"Enum: {x.DataType}");

        Console.WriteLine($"JSON: {JsonSerializer.Serialize(x)}");

        Console.WriteLine();

        var y = new Thing2();

        var start = DateTime.Now;

        for (int i = 0; i < 100000; i++) {

            y.DataType = "Date";

            y.DataType = "String";

        }

        var duration = DateTime.Now - start;

        Console.WriteLine($"Converted Enum: {y.DataType}");

        Console.WriteLine($"JSON: {JsonSerializer.Serialize(y)}");

        Console.WriteLine($"Duration: {duration}");

        Console.WriteLine();

​

        var z = new Thing3();

        var start2 = DateTime.Now;

        for (int i = 0; i < 100000; i++) {

            z.DataType = "Date";

            z.DataType = "String";

        }

        var duration2 = DateTime.Now - start2;

        Console.WriteLine($"List<string> lookup: {z.DataType}");

        Console.WriteLine($"JSON: {JsonSerializer.Serialize(z)}");

        Console.WriteLine($"Duration: {duration2}");

    }

}