di and serialization support

TelegramBotBase/Factories/ServiceProviderStartFormFactory.cs

@@ -23,13 +23,15 @@ public class ServiceProviderStartFormFactory : IStartFormFactory
         _serviceProvider = serviceProvider;
     }
 
-    public FormBase CreateForm()
+    public FormBase CreateForm() => CreateForm(null);
+
+    public FormBase CreateForm(Type? specifiedStartFrom = null)
     {
         FormBase fb = null;
 
         try
         {
-            fb = (FormBase)ActivatorUtilities.CreateInstance(_serviceProvider, _startFormClass);
+            fb = (FormBase)ActivatorUtilities.CreateInstance(_serviceProvider, specifiedStartFrom ?? _startFormClass);
         }
         catch(InvalidOperationException ex)
         {

TelegramBotBase/SessionManager.cs

@@ -6,6 +6,7 @@ using System.Threading.Tasks;
 using TelegramBotBase.Args;
 using TelegramBotBase.Attributes;
 using TelegramBotBase.Base;
+using TelegramBotBase.Factories;
 using TelegramBotBase.Form;
 using TelegramBotBase.Interfaces;
 using TelegramBotBase.Sessions;
@@ -145,9 +146,17 @@ public class SessionManager
             {
                 continue;
             }
-
+            FormBase form;
+            if (BotBase.StartFormFactory is ServiceProviderStartFormFactory diFactory)
+            {
+                form = diFactory.CreateForm(t);
+            }
             //No default constructor, fallback
-            if (!(t.GetConstructor(new Type[] { })?.Invoke(new object[] { }) is FormBase form))
+            else if (t.GetConstructor(new Type[] { })?.Invoke(new object[] { }) is FormBase f)
+            {
+                form = f;
+            }
+            else
             {
                 if (!statemachine.FallbackStateForm.IsSubclassOf(typeof(FormBase)))
                 {