Send Ionic Push Notification to Android App by C# using FCM

Step 1: Create an application in asp.net with C# and paste the following code.

 using System;

 namespace WebToSendIonicNotic

 {

    public partial class Default : System.Web.UI.Page

    {

        protected void Page_Load(object sender, EventArgs e)

        {

        }

       

        protected void btnSend_Click(object sender, EventArgs e)

        {

            string devicePushToken = "et7xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxsX";

            string Message = txtMessage.Text;

           

            //Start sending push notification to apps

            PushNotification fcmPush = new PushNotification();

            PushNotification result = fcmPush.SendNotification(devicePushToken,"Notification title", Message, "news");

            //End push notification

        }

    }

 }

 Step 2: Create a class with the name PushNotification and paste the following code. You can get YOUR_FCM_SERVER_API_KEY and YOUR_FCM_SENDER_ID at console firebase, for more details click here

 using System;

 using System.IO;

 using System.Net;

 using System.Text;

 using System.Web.Script.Serialization;

 namespace WebToSendIonicNotic

 {

    public class PushNotification

    {

        public PushNotification()

        {

         

        }

        public bool Successful

        {

            get;

            set;

        }

        public string Response

        {

            get;

            set;

        }

        public Exception Error

        {

            get;

            set;

        }

        public PushNotification SendNotification(string YOUR_FCM_DEVICE_ID, string _title,                                                     string _message, string _topic)

        {

            string YOUR_FCM_SERVER_API_KEY = "TWI7pb0DYxxxxxxxxxxxxxxxxe9S1Oq1KFzd4NkNZDQH";

            string YOUR_FCM_SENDER_ID = "xxxxxxxxxxxx";

          

            PushNotification result = new PushNotification();

            try

            {

                result.Successful = true;

                result.Error = null;              

                var requestUri = "https://fcm.googleapis.com/fcm/send";

                WebRequest webRequest = WebRequest.Create(requestUri);

                webRequest.Method = "POST";

                webRequest.Headers.Add(string.Format("Authorization: key={0}", YOUR_FCM_SERVER_API_KEY));

                webRequest.Headers.Add(string.Format("Sender: id={0}", YOUR_FCM_SENDER_ID));

                webRequest.ContentType = "application/json";

                var data = new

                {

                     to = YOUR_FCM_DEVICE_ID, //If you want to test for single device.

                    //to = "/topics/" + _topic, // this is for topic

                    notification = new

                    {

                        title = _title,

                        body = _message,

                        //icon="myicon"

                    }

                };

                var serializer = new JavaScriptSerializer();

                var json = serializer.Serialize(data);

                Byte[] byteArray = Encoding.UTF8.GetBytes(json);

                webRequest.ContentLength = byteArray.Length;

                using (Stream dataStream = webRequest.GetRequestStream())

                {

                    dataStream.Write(byteArray, 0, byteArray.Length);

                    using (WebResponse webResponse = webRequest.GetResponse())

                    {

                        using (Stream dataStreamResponse = webResponse.GetResponseStream())

                        {

                            using (StreamReader tReader = new StreamReader(dataStreamResponse))

                            {

                                String sResponseFromServer = tReader.ReadToEnd();

                                result.Response = sResponseFromServer;

                            }

                        }

                    }

                }

            }

            catch (Exception ex)

            {

                result.Successful = false;

                result.Response = null;

                result.Error = ex;

            }

            return result;

        }

    }

 }