Example for a Join/Leave Messages delete Bot

Examples/JoinHiderBot/JoinHiderBot.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="TelegramBotBase" Version="3.0.0" />
+  </ItemGroup>
+
+</Project>

Examples/JoinHiderBot/Program.cs

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+using System;
+
+namespace JoinHiderBot
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+
+            String apiKey = "";
+
+            var bot = new TelegramBotBase.BotBase<forms.Start>(apiKey);
+
+            bot.Start();
+
+            Console.ReadLine();
+        }
+    }
+}

Examples/JoinHiderBot/forms/GroupManageForm.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Threading.Tasks;
+using TelegramBotBase.Args;
+using TelegramBotBase.Form;
+
+namespace JoinHiderBot.forms
+{
+    public class GroupManageForm : GroupForm
+    {
+
+        public override async Task OnMemberChanges(MemberChangeEventArgs e)
+        {
+            if (e.Type != Telegram.Bot.Types.Enums.MessageType.ChatMembersAdded && e.Type != Telegram.Bot.Types.Enums.MessageType.ChatMemberLeft)
+                return;
+
+
+            var m = e.Result.Message;
+
+            await this.Device.DeleteMessage(m);
+        }
+
+    }
+}

Examples/JoinHiderBot/forms/Start.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Threading.Tasks;
+using TelegramBotBase.Base;
+using TelegramBotBase.Form;
+
+namespace JoinHiderBot.forms
+{
+    public class Start :  SplitterForm
+    {
+        public override async Task<bool> Open(MessageResult e)
+        {
+            await this.Device.Send("This bot works only in groups.");
+
+            return true;
+        }
+
+        public override async Task<bool> OpenGroup(MessageResult e)
+        {
+            var gmf = new GroupManageForm();
+
+            await this.NavigateTo(gmf);
+
+            return true;
+        }
+
+    }
+}