onesignal_post_notification_example_with_emojis.cs

using System.Linq;
using System.Text;

using System.IO;
using System.Net;

// TODO: Replace YOUR_ONESIGNAL_REST_API_KEY with your key.
// TODO: Replace YOUR_ONESIGNAL_APP_ID with your app id.

namespace ConsoleApplication3
{
    class Program
    {
        static void Main(string[] args)
        {

            var request = WebRequest.Create("https://onesignal.com/api/v1/notifications") as HttpWebRequest;

            request.KeepAlive = true;
            request.Method = "POST";
            request.ContentType = "application/json";

            request.Headers.Add("authorization", "Basic YOUR_ONESIGNAL_REST_API_KEY");

            byte[] byteArray = Encoding.UTF8.GetBytes("{"
                                                    + "\"app_id\": \"YOUR_ONESIGNAL_APP_ID\","
                                                    + "\"contents\": {\"en\": \"Test Message 👍\"},"
                                                    + "\"included_segments\": [\"All\"]}");

            string responseContent = null;

            try
            {
                using (var writer = request.GetRequestStream())
                {
                    writer.Write(byteArray, 0, byteArray.Length);
                }

                using (var response = request.GetResponse() as HttpWebResponse)
                {
                    using (var reader = new StreamReader(response.GetResponseStream()))
                    {
                        responseContent = reader.ReadToEnd();
                    }
                }
            }
            catch (WebException ex)
            {
                System.Diagnostics.Debug.WriteLine(ex.Message);
                System.Diagnostics.Debug.WriteLine(new StreamReader(ex.Response.GetResponseStream()).ReadToEnd());
            }

            System.Diagnostics.Debug.WriteLine(responseContent);
        }
    }
}