using System;

using System.Collections.Generic;

using System.Text.Json;

using System.Xml.Serialization;

public class Program

{

    public static void Main()

    {

        var lst = new List<NameValuePair>();

        var nvp = new NameValuePair()

        {

            Name = "n",

            Value= "v"

        };

        lst.Add(nvp);

        var x = JsonSerializer.Serialize(lst);

        Console.WriteLine(x);

    }

    [Serializable]

    public class NameValuePair

    {

        private string _name;

        private string _value;

​

​

        public NameValuePair()

        {

        }

​

        public NameValuePair(string name, string value)

        {

            _name = name;

            _value = value;

        }

​

        [XmlAttribute]

        public string Name

        {

            get { return _name; }

            set { _name = value; }

        }

​

        [XmlAttribute]

        public string Value

        {

            get { return _value; }

            set { _value = value; }

        }

    }

}