using System;

using System.Collections.Generic;

using Newtonsoft.Json;

public class Program

{

    public static void Main()

    {

        var str = "[{a:1},{b:2}]";

        var json = Newtonsoft.Json.JsonConvert.DeserializeObject(str);

        foreach(Newtonsoft.Json.Linq.JObject item in (System.Collections.IEnumerable) json) {

            Console.WriteLine(item.GetType());

            var xx = item.ToObject<Dictionary<string,object>>();

            Console.WriteLine(String.Join(",", xx.Keys));

        }

    }

}

​