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.