Linq Enumerable to another Collection

given devices is an IEnumberable<>

var nvc = devices.Aggregate(new NameValueCollection(), (seed, current) => { seed.Add("device", current.Id.ToString()); return seed; });

Json Array of objects to Dictionary, keyed (indexed) on chosen property

using Json.Net; //Newtonsoft
using Json.Net.Linq;

public class Device {
  public int Id {get; set;}
  public string Name {get; set;}
  public string Property {get; set;}
}

var json = @"[{id: 1, name: ""name1"", prop: ""prop1""}, {id: 2, name: ""name2"", prop: ""prop""}]";

var devicesDictionary = JArray.Parse(json).ToDictionary( i=>i["id"].Value<int>(), i=>i.ToObject<Device>() );