fixed modern style for ensuring props are not null and extracting values.

src/Nocr.TelegramClient.AppServices/Handlers/BaseHandlers/StartHandlerBase.cs

@@ -28,24 +28,12 @@ public abstract class StartHandlerBase
 
     public async Task Handle(Update update, CancellationToken cancellationToken = default)
     {
-        if (update.Message?.From is null || update.CallbackQuery?.Message is null)
+        long telegramId = update.Type switch
         {
-            _logger.LogError("Не удалось выделить пользовательский колбэк.\n{@Update}", update);
+            UpdateType.Message when update.Message?.From is { } from => from.Id,
-            return;
+            UpdateType.CallbackQuery when update.CallbackQuery?.From is { } from => from.Id,
-        }
+            _ => throw new ArgumentOutOfRangeException(nameof(update.Type), "Unsupported update type or missing From.")
-
+        };
-        long telegramId;
-        switch (update.Type)
-        {
-            case UpdateType.Message:
-                telegramId = update.Message.From.Id;
-                break;
-            case UpdateType.CallbackQuery:
-                telegramId = update.CallbackQuery.From.Id;  
-                break;
-            default:
-                throw new ArgumentOutOfRangeException(nameof(update.Type), "Unsupported update type");
-        }
 
         var message = new TextMessage(telegramId)
         {
@@ -54,16 +42,18 @@ public abstract class StartHandlerBase
             ReplyMarkup = GetKeyboard()
         };
 
-        if (update.Type == UpdateType.CallbackQuery)
+        if (update is { Type: UpdateType.CallbackQuery, CallbackQuery.Message: { } m })
         {
-            var messageId = update.CallbackQuery.Message.MessageId;
+            var messageId = m.MessageId;
-            if (update.CallbackQuery.Message.Type == MessageType.Text)
+
+            if (m.Type == MessageType.Text)
             {
                 await Bot.EditMessageTextAsync(messageId, message, cancellationToken);
                 return;
             }
 
-            var chatId = update.CallbackQuery.Message.Chat.Id;
+            var chatId = m.Chat.Id;
+
             try
             {
                 await Bot.DeleteMessageAsync(chatId, messageId, cancellationToken);

src/Nocr.TelegramClient.AppServices/Handlers/Messages/SubscribeExactMessage/SubscribeHandlerBase.cs

@@ -28,7 +28,8 @@ public abstract class SubscribeHandlerBase : ViewSubscriptionHandlerBase
     {
         if (update.Message?.Text is null || update.Message?.From is null)
         {
-            _logger.LogError("Не удалось выделить пользовательское сообщение.\n{@Update}", update);
+            _logger.LogError("Cannot parse update message or from/text user unknown. {@Update}", update.Id);
+            _logger.LogDebug(update.ToString());
             return;
         }