public async IAsyncEnumerable <MessageResponse> Handler(Message message) { yield return("准备中……"); UserInfo senderInfo; try { senderInfo = await _backendService.GetUserByTelegramIdAsync(message.From.Id); } catch (MatatakiUserNotFoundException) { throw new HandlerException("抱歉,目标没有绑定 Matataki 帐号或者仍未同步用户名"); } var groupButtons = new List <InlineButton[]>(); foreach (var groupId in await _groupService.GetParticipatedGroupsAsync(message.From.Id)) { try { var chat = await _botClient.GetChatAsync(groupId); groupButtons.Add(new[] { InlineButton.WithCallbackData(chat.Title, $"createHongbao {message.From.Id} {chat.Id}") }); } catch (ChatNotFoundException) { _logger.Warning("Chat not found: {Chat}", groupId); } } yield return(Markdown("请选择你要发红包的群").WithInlineButtons(groupButtons)); }