Fix ReactorError not correctly raised. Added Program_ReactorError example

Examples/Program_ReactorError.cs

@@ -0,0 +1,71 @@
+using System;
+using System.Threading.Tasks;
+using Telegram.Bot.Types;
+using TL;
+
+namespace WTelegramClientTest
+{
+	static class Program_ReactorError
+	{
+		static WTelegram.Client Client;
+
+		// go to Project Properties > Debug > Environment variables and add at least these: api_id, api_hash, phone_number
+		static async Task Main(string[] _)
+		{
+			Console.WriteLine("The program demonstrate how to handle ReactorError. Press any key to terminate");
+			WTelegram.Helpers.Log = (l, s) => System.Diagnostics.Debug.WriteLine(s);
+			try
+			{
+				await CreateAndConnect();
+				Console.ReadKey();
+			}
+			finally
+			{
+				Client?.Dispose();
+			}
+		}
+
+		private static async Task CreateAndConnect()
+		{
+			Client = new WTelegram.Client(Environment.GetEnvironmentVariable);
+			Client.OnUpdate += Client_OnUpdate;
+			Client.OnOther += Client_OnOther;
+			var my = await Client.LoginUserIfNeeded();
+			Console.WriteLine($"We are logged-in as " + my);
+		}
+
+		private static async Task Client_OnOther(IObject arg)
+		{
+			if (arg is ReactorError err)
+			{
+				// typically: network connection was totally lost
+				Console.WriteLine($"Fatal reactor error: {err.Exception.Message}");
+				while (true)
+				{
+					Console.WriteLine("Disposing the client and trying to reconnect in 5 seconds...");
+					Client?.Dispose();
+					Client = null;
+					await Task.Delay(5000);
+					try
+					{
+						await CreateAndConnect();
+						break;
+					}
+					catch (Exception ex)
+					{
+						Console.WriteLine("Connection still failing: " + ex.Message);
+					}
+				}
+			}
+			else
+				Console.WriteLine("Other: " + arg.GetType().Name);
+		}
+
+		private static Task Client_OnUpdate(UpdatesBase updates)
+		{
+			foreach (var update in updates.UpdateList)
+				Console.WriteLine(update.GetType().Name);
+			return Task.CompletedTask;
+		}
+	}
+}