using System;

using System.IO;

using System.Linq;

using System.Reflection;

using System.Runtime.Serialization;

using System.Text.Json;

using System.Text.Json.Serialization;

using Microsoft.AspNetCore.Mvc;

using System.Text.Encodings.Web;

using System.Text.Unicode;

​

​

public class Program {

    public enum Operator {

        [EnumMember(Value = "and")] And,

        [EnumMember(Value = "or")] Or,

        [EnumMember(Value = "not")] Not,

        [EnumMember(Value = "none")] None,

        [EnumMember(Value = "<=")] LessOrEqual,

            [EnumMember(Value = "lesseq")] LessEq,

        [EnumMember(Value = "<")] Less,

        [EnumMember(Value = "=")] Equal,

        [EnumMember(Value = ">=")] GreaterOrEqual,

        [EnumMember(Value = ">")] Greater,

        [EnumMember(Value = "!=")] NotEqual,

        [EnumMember(Value = "in")] In,

        [EnumMember(Value = "!in")] NotIn,

    }

​

    public class BasicJson { 

            public Operator Operator    {get; init;}

    }

​

    public static void Main() {

        JsonSerializerOptions SerializationOptions = new() {

        PropertyNamingPolicy = JsonNamingPolicy.CamelCase,

        // IgnoreNullValues applies to both serialization and deserialization.

        // It is especially important for deserialization - it allows us to have

        // non-nullable fields initialized to a default value and know that

        // System.text.json won't assign over that default with null.

        IgnoreNullValues = true,

        Converters = {

                new JsonStringEnumConverter()

            },

​

    };

        var serialized = JsonSerializer.Deserialize<BasicJson>("{\"operator\": \"<=\"}", SerializationOptions);

        Console.Write($"{serialized.Operator}");

​

    }

​

​

}