在 MS BotFramework 中使用 PromptDialog 开始对话

Question

bot 是否有合适的方式在 Direct Line 频道中与 PromptDialog.Choice 开始对话？

我正在尝试一个丑陋的 hack，抓住拳头 ConversationUpdate 活动并创建来自用户的假消息来初始化对话框，如下所示：

IMessageActivity greetingMessage = Activity.CreateMessageActivity();
greetingMessage.From = message.Recipient;//from bot
greetingMessage.Recipient = userAccount;//to user
greetingMessage.Conversation = message.Conversation;
greetingMessage.Text = "Hello, I am a bot";
greetingMessage.Locale = "en-us";
greetingMessage.Id = Guid.NewGuid().ToString();

await connector.Conversations.SendToConversationAsync((Activity)greetingMessage);

IMessageActivity dialogEntryMessage = Activity.CreateMessageActivity();
dialogEntryMessage.Recipient = message.Recipient;//to bot
dialogEntryMessage.From = message.From;//from user
dialogEntryMessage.Conversation = message.Conversation;
dialogEntryMessage.Text = "any text";
dialogEntryMessage.Locale = "en-us";
dialogEntryMessage.ChannelId = message.ChannelId;
dialogEntryMessage.ServiceUrl = message.ServiceUrl;
dialogEntryMessage.Id = Guid.NewGuid().ToString();
dialogEntryMessage.ReplyToId = greetingMessage.Id;

await Conversation.SendAsync(dialogEntryMessage, () => new Dialogs.RootDialog());

其中message 是来自ConversationUpdate 的消息。在 RootDialog 中，我以 PromptDialog.Choice 开头。

它在模拟器中工作，但在 Direct Line 频道中，机器人不记得对话状态，当用户选择其中一个对话选项并发送他的第一条真实消息时，根对话再次从 PromptDialog.Choice 开始，因此出现两次。

更新

我找到了来自微软的相关博文：https://blog.botframework.com/2018/07/12/how-to-properly-send-a-greeting-message-and-common-issues-from-customers/

Answer 1

在 Direct Line 频道中，机器人不记得对话状态，当用户选择其中一个对话选项并发送他的第一条真实消息时，根对话会从 PromptDialog.Choice 再次启动，因此它会出现两次。

我可以在我这边重现同样的问题，我发现当机器人和用户都添加到对话中时，ConversationUpdate 处理程序将被执行。

要解决这个问题，您可以参考以下代码示例。

在 MessagesController 中：

else if (message.Type == ActivityTypes.ConversationUpdate)
{
    // Handle conversation state changes, like members being added and removed
    // Use Activity.MembersAdded and Activity.MembersRemoved and Activity.Action for info
    // Not available in all channels

    if (update.MembersAdded != null && update.MembersAdded.Any())
    {
        foreach (var newMember in update.MembersAdded)
        {
            if (newMember.Name == "{your_botid_here}")
            {
                IMessageActivity greetingMessage = Activity.CreateMessageActivity();

                //...
                //your code logic
                //...

                IMessageActivity dialogEntryMessage = Activity.CreateMessageActivity();
                dialogEntryMessage.Recipient = message.Recipient;//to bot
                dialogEntryMessage.From = message.From;//from user
                dialogEntryMessage.Conversation = message.Conversation;
                dialogEntryMessage.Text = "show choices";
                dialogEntryMessage.Locale = "en-us";
                dialogEntryMessage.ChannelId = message.ChannelId;
                dialogEntryMessage.ServiceUrl = message.ServiceUrl;
                dialogEntryMessage.Id = System.Guid.NewGuid().ToString();
                dialogEntryMessage.ReplyToId = greetingMessage.Id;

                await Conversation.SendAsync(dialogEntryMessage, () => new Dialogs.RootDialog());
            }
        }
    }
}

在 RootDialog 中：

private async Task MessageReceivedAsync(IDialogContext context, IAwaitable<object> result)
{
    var activity = await result as Activity;

    var mes = activity.Text.ToLower();

    string[] choices = new string[] { "choice 1", "choice 2" };

    if (Array.IndexOf(choices, mes) > -1)
    {
        await context.PostAsync($"You selected {mes}");
    }
    else if(mes == "show choices")
    {
        PromptDialog.Choice(context, resumeAfterPrompt, choices, "please choose an option.");
    }
    else
    {
        await context.PostAsync($"You sent {activity.Text} which was {length} characters.");
        context.Wait(MessageReceivedAsync);
    }

}

private async Task resumeAfterPrompt(IDialogContext context, IAwaitable<string> result)
{
    string choice = await result;

    await context.PostAsync($"You selected {choice}");
}

测试结果：