FortniteIdChecker.cs

/* Grab your API Key from : https://fortniteapi.io */

using Newtonsoft.Json.Linq;
using System.IO;
using System.Net;
using System.Windows;
using System.Windows.Documents;

namespace Anwendung_1
{
    /// <summary>
    /// Interaktionslogik für MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        const string url = "https://fortniteapi.io/lookup";
        
        private void Button_Click(object sender, RoutedEventArgs e)
        {
            string username = txt_username.Text;
            string apikey = txt_apikey.Text;

            if (txt_username.Text == "")
            {
                MessageBox.Show("Bitte gib einen Benutzername ein!", "Benutzername Eingeben!");
            } else if (txt_apikey.Text == "")
            {
                MessageBox.Show("Bitte gib deinen API Key ein!", "API Key Eingeben!");
            } else 
            {

                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url + "?username=" + username);
                WebHeaderCollection requestHeaders = request.Headers;

                request.Method = "POST";
                request.Timeout = 30000;
                request.ContentType = "application/json";
                request.UserAgent = "Fortnite Private ID Checker";

                requestHeaders.Add("Authorization", apikey);
                requestHeaders.Add("Accept-Language", "en;q=0.8");

                var response = (HttpWebResponse)request.GetResponse();

                using (var sr = new StreamReader(response.GetResponseStream()))
                {
                    var jsonResponse = sr.ReadToEnd();
                    JObject jobject = JObject.Parse(jsonResponse);

                    string accountID = (string)jobject["account_id"];

                    txt_rb.Document.Blocks.Clear();
                    txt_rb.Document.Blocks.Add(new Paragraph(new Run("Accountname : " + username + "\n" + "Account ID : " + accountID)));
                }               
            }
        }
    }
}