using System;

using System.Linq;

using System.Collections.Generic;

using Newtonsoft.Json;

public class Program

{

    public static void Main()

    {

        var json = @"{

 ""displayFieldName"": ""REPNAME"",

 ""fieldAliases"": {

  ""DISTRICT"": ""DISTRICT"",

  ""REPNAME"": ""REPNAME""

 },

 ""fields"": [

  {

   ""name"": ""DISTRICT"",

   ""type"": ""esriFieldTypeDouble"",

   ""alias"": ""DISTRICT""

  },

  {

   ""name"": ""REPNAME"",

   ""type"": ""esriFieldTypeString"",

   ""alias"": ""REPNAME"",

   ""length"": 150

  }

 ],

 ""features"": [

  {

   ""attributes"": {

    ""DISTRICT"": 21,

    ""REPNAME"": ""Ira Anders""

   }

  }

 ]

}";

        var rootObject = JsonConvert.DeserializeObject<RootObject>(json);

        var attributes = rootObject.features.Select(f => f.attributes);

        foreach (var a in attributes)

        {

            Console.WriteLine("DISTRICT: " + a.DISTRICT);

            Console.WriteLine("REPNAME: " + a.REPNAME);

        }

    }

}

​

public class FieldAliases

{

    public string DISTRICT { get; set; }

    public string REPNAME { get; set; }

}

​

public class Field

{

    public string name { get; set; }

    public string type { get; set; }

    public string alias { get; set; }

    public int? length { get; set; }

}

​

public class Attributes

{

    public int DISTRICT { get; set; }

    public string REPNAME { get; set; }

}

​

public class Feature

{

    public Attributes attributes { get; set; }

}

​

public class RootObject

{

    public string displayFieldName { get; set; }

    public FieldAliases fieldAliases { get; set; }

    public List<Field> fields { get; set; }

    public List<Feature> features { get; set; }

}