using System;

using System.Collections.Generic;

using Newtonsoft.Json;

using System.Xml;

public class Program

{

    public static void Main()

    {

            var xml = @"<myRoot>

  <item>

  <a>aaaa</a>

  </item>

  <item>

  <a>bbbb</a>

  </item>

  <item>

  <a>cccc</a>

  </item>

</myRoot>";

​

            XmlDocument xmldocument = new XmlDocument();

            xmldocument.LoadXml(xml);

​

​

            var json = JsonConvert.SerializeXmlNode(xmldocument,Newtonsoft.Json.Formatting.Indented,true);

            Console.WriteLine(json);

        //Output : {"Items":{"Item":[{"Name":"name","Detail":"detail"}]}}

    }

}

​

​