How to send Android push notifications via GCM on C# .Net

Question

I\'m new to all Android GCM push notifications and I have read stack posts but couldn\'t get a straight answer.I have also read Create push notification in android to get a

Answer 1

I have worked with Android Applications and IOS application using Firebase's FCM. This code is working .Middle layer is ASP.NET API.You start a project in visual studio and select API.To be create a controller.Your server_api_key and sender id adding Web.config file.

Adding user fcm server_api_key and sender id.

The below code to add your controller

 using System;
    using System.Net;
    using System.Web.Http;
    using System.Web.Script.Serialization;
    using System.Configuration;
    using System.IO;

    namespace pushios.Controllers
        {

        public class HomeController : ApiController
            {
                [HttpGet]

        [Route("sendmessage")]

                public IHttpActionResult SendMessage()
              {
                    var data = new {
                        to = "Device Token",
                        data = new
                        {
                           //To be adding your json data
                            body="Test",
                            confId= "",
                            pageTitle= "test",
                            pageFormat= "",
                            dataValue= "",
                            title= "C#",
                            webviewURL= "",
                            priority = "high",
                            notificationBlastID = "0",
                            status = true
                        }
                    };
                    SendNotification(data);
                    return Ok();
                }
                public void SendNotification(object data)
                {
                    var Serializer = new JavaScriptSerializer();
                    var json = Serializer.Serialize(data);
                    Byte[] byteArray = System.Text.Encoding.UTF8.GetBytes(json);

                    SendNotification(byteArray);
                }
                public void SendNotification(Byte[] byteArray)
                {

                    try
                    {
                        String server_api_key = ConfigurationManager.AppSettings["SERVER_API_KEY"];
                        String senderid = ConfigurationManager.AppSettings["SENDER_ID"];

                        WebRequest type = WebRequest.Create("https://fcm.googleapis.com/fcm/send");
                        type.Method = "post";
                        type.ContentType = "application/json";
                        type.Headers.Add($"Authorization: key={server_api_key}");
                        type.Headers.Add($"Sender: id={senderid}");

                        type.ContentLength = byteArray.Length;
                        Stream datastream = type.GetRequestStream();
                        datastream.Write(byteArray, 0, byteArray.Length);
                        datastream.Close();

                        WebResponse respones = type.GetResponse();
                        datastream = respones.GetResponseStream();
                        StreamReader reader = new StreamReader(datastream);

                        String sresponessrever = reader.ReadToEnd();
                        reader.Close();
                        datastream.Close();
                        respones.Close();

                    }
                    catch (Exception)
                    {
                        throw;
                    }

                }
            }
        }