using System;

using System.Collections.Generic;

using Newtonsoft.Json;

public class Program

{

    public static void Main()

    {

        string json = @"

            [

              {

                ""tagname"": ""mytag1"",

                ""engunits"": """",

                ""value"": ""2"",

                ""quality"": ""Good NonSpecific"",

                ""timestamp"": ""2018-12-13T10:45:05Z""

              },

              {

                ""tagname"": ""myTag2"",

                ""engunits"": """",

                ""value"": ""0"",

                ""quality"": ""Good NonSpecific"",

                ""timestamp"": ""2018-12-13T10:45:00Z""

              }

            ]";

​

        var deserializedResult = JsonConvert.DeserializeObject<List<HistorianRecord>>(json);

​

        var anon = new

        {

            name = "ARandomName",

            content = deserializedResult

        };

​

        string updatedJson = JsonConvert.SerializeObject(anon, Formatting.Indented);

​

        Console.WriteLine(updatedJson);

    }

}

​

class HistorianRecord

{

    public string tagname { get; set; }

    public string engunits { get; set; }

    public string value { get; set; }

    public string quality { get; set; }

    public DateTime timestamp { get; set; }

}

​