using System;

using System.Collections.Generic;

using System.Linq;      

​

public class Program

{

    public static void Main()

    {

        var devices = DataGenerator.Generate();

​

            //1 display all telemetries of Device5

            var device5 = devices.FirstOrDefault(d => d.Name == "Device5");

            foreach (var telemetry in device5.Telemetries)

            {

                Console.WriteLine(string.Format("Sensor:{0}, Value:{1}, Timestamp:{2}", telemetry.Sensor, telemetry.Value, telemetry.Timestamp));

            }

​

            //2 display the latest telemetry

            var maxTelemetry = devices.SelectMany(d => d.Telemetries).OrderByDescending(t => t.Timestamp).FirstOrDefault();

            Console.WriteLine(string.Format("Sensor:{0}, Value:{1}, Timestamp:{2}", maxTelemetry.Sensor, maxTelemetry.Value, maxTelemetry.Timestamp));

​

    }

​

    public class DataGenerator

    {

        public static List<Device> Generate()

        {

            var dummyDevices = new List<Device>();

​

            dummyDevices.Add(new Device() { Id = 1, Name = "Device1", Telemetries = GenerateData("Temp", 10) });

            dummyDevices.Add(new Device() { Id = 2, Name = "Device2", Telemetries = GenerateData("Temp", 20) });

            dummyDevices.Add(new Device() { Id = 3, Name = "Device3", Telemetries = GenerateData("Temp", 15) });

            dummyDevices.Add(new Device() { Id = 4, Name = "Device4", Telemetries = GenerateData("Temp", 5) });

            dummyDevices.Add(new Device() { Id = 5, Name = "Device5", Telemetries = GenerateData("Temp", 25) });

​

            return dummyDevices;

        }

​

        private static List<Telemetry> GenerateData(string sensor, int count)

        {

            var dummyData = new List<Telemetry>();

​

            for (int i = 0; i < count; i++)

            {

                dummyData.Add(new Telemetry() { Id = i, Sensor = sensor, Value = new decimal(new Random().NextDouble()), Timestamp = DateTime.Now.AddSeconds(i) });

            }

​

            return dummyData;

        }

    }

​

    public class Device

    {

        public int Id { get; set; }

        public string Name { get; set; }

        public List<Telemetry> Telemetries { get; set; }

    }

​

    public class Telemetry

    {

        public int Id { get; set; }

        public string Sensor { get; set; }

        public decimal Value { get; set; }

        public DateTime Timestamp { get; set; }

    }

}