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In the last tutorial, I showed how to control the lights.
You can find it here: [#2] How to control Hue Lights | Philips Hue - C# Programming

Sensors

You will find a lot more than lights in the Philips Hue System, called sensors. This tutorial is limited to the Hue Motion Sensor and Hue Dimmer Switch because I don't own a Hue Tap Switch. I will focus on the motion sensor which has a built-in temperature sensor. I will show how to get the sensor data, parse it into an object and show the temperature.

Lets create the sensor template:
private const string SensorUrlTemplate = "http://{0}/api/{1}/{2}";

Now use the GetRequestToBridge from the last Tutorial:
string result = GetRequestToBridge(string.Format(SensorUrlTemplate, BridgeIP, Usercode, "sensors"));

As result, you will get all sensors from your hue system formatted as JSON. Every sensor has different properties so it's a little bit hard to parse this JSON. I created a helper class for parsing (http://json2csharp.com/) and modified it:

using System;
using System.Collections.Generic;
using Newtonsoft.Json;
using HueTestForms.Enumerations;
namespace HueTestForms.Helpers
{
    public partial class SensorHelper
    {
        public string ID { get; internal set; }
        public SensorTypes SensorType { get; set; }
        [JsonProperty("state")]
        public SensorHelperHelperState State { get; set; }
        [JsonProperty("config")]
        public SensorHelperHelperConfig Config { get; set; }
        [JsonProperty("name")]
        public string Name { get; set; }
        [JsonProperty("type")]
        public SensorTypes Type { get; set; }
        [JsonProperty("modelid")]
        public string Modelid { get; set; }
        [JsonProperty("manufacturername")]
        public string Manufacturername { get; set; }
        [JsonProperty("swversion")]
        public string Swversion { get; set; }
        [JsonProperty("uniqueid")]
        public string Uniqueid { get; set; }
        [JsonProperty("recycle")]
        public bool Recycle { get; set; }
        [JsonProperty("swupdate")]
        public SensorHelperHelperSwupdate Swupdate { get; set; }
    }
    public partial class SensorHelperHelperConfig
    {
        [JsonProperty("on")]
        public bool On { get; set; }
        [JsonProperty("configured")]
        public bool Configured { get; set; }
        [JsonProperty("sunriseoffset")]
        public long Sunriseoffset { get; set; }
        [JsonProperty("sunsetoffset")]
        public long Sunsetoffset { get; set; }
        [JsonProperty("reachable")]
        public bool Reachable { get; set; }
        [JsonProperty("battery")]
        public long Battery { get; set; }
        [JsonProperty("pending")]
        public List<object> Pending { get; set; }
        [JsonProperty("flag")]
        public bool Flag { get; set; }
        [JsonProperty("alert")]
        public string Alert { get; set; }
        [JsonProperty("ledindication")]
        public bool Ledindication { get; set; }
        [JsonProperty("usertest")]
        public bool Usertest { get; set; }
        [JsonProperty("sensitivity")]
        public long? Sensitivity { get; set; }
        [JsonProperty("sensitivitymax")]
        public long? Sensitivitymax { get; set; }
        [JsonProperty("tholddark")]
        public long? Tholddark { get; set; }
        [JsonProperty("tholdoffset")]
        public long? Tholdoffset { get; set; }
    }
    public partial class SensorHelperHelperState
    {
        [JsonProperty("daylight")]
        public object Daylight { get; set; }
        [JsonProperty("lastupdated")]
        public string Lastupdated { get; set; }
        [JsonProperty("status")]
        public long Status { get; set; }
        [JsonProperty("buttonevent")]
        public long Buttonevent { get; set; }
        [JsonProperty("temperature")]
        public double Temperature { get; set; }
        [JsonProperty("presence")]
        public bool Presence { get; set; }
        [JsonProperty("lightlevel")]
        public long Lightlevel { get; set; }
        [JsonProperty("dark")]
        public bool Dark { get; set; }
    }
    public partial class SensorHelperHelperSwupdate
    {
        [JsonProperty("state")]
        public string State { get; set; }
        [JsonProperty("lastinstall")]
        public object Lastinstall { get; set; }
    }

    public static class SensorHelperHelperSerialize
    {
        public static string ToJson(this SensorHelper self) => JsonConvert.SerializeObject(self, SensorHelperHelperConverter.Settings);
    }
    public class SensorHelperHelperConverter
    {
        public static readonly JsonSerializerSettings Settings = new JsonSerializerSettings
        {
            MetadataPropertyHandling = MetadataPropertyHandling.Ignore,
            DateParseHandling = DateParseHandling.None,
        };
    }
}

As I mentioned in the beginning, I don't own a Hue tap switch so maybe the parsing will fail if you own one.
For the Type I added an enum:

public enum SensorTypes
    {
        Daylight,
        CLIPGenericFlag,
        ZLLSwitch,
        CLIPGenericStatus,
        ZLLTemperature,
        ZLLPresence,
        ZLLLightLevel,
    }

For parsing:

public partial class SensorHelper
    {
        public static List<SensorHelper> FromJson(string json)
        {
            var dict = JsonConvert.DeserializeObject<Dictionary<string, SensorHelper>>(json, SensorHelperHelperConverter.Settings);
            var result = new List<SensorHelper>();
            foreach (var item in dict)
            {
                item.Value.ID = item.Key;
                result.Add(item.Value);
            }
            return result;
        }
    }

I deserialize it to a dictonary>string, Sensorhelper> to keep the ID as Key. Afterwards I create a List of SensorHelper and add the ID to every object. I do this to have the ID in the object and don't have to handle with a dictonary.

Now it's easy to get the Temperature:

SensorList.Where(s => s.State.Temperature != 0).First().State.Temperature;

The temperature is stored as int so you have to add the comma!

If you have any questions do not hesitate to contact me per comment 😃