使用C＃在一个Bot中进行多个QnA服务

Question

我有3个QnA服务。我希望它们可以同时用于单个BOT。如何使用C＃实现这一点。我最初的想法是将KB ID和Sub Key放入一个数组（如何实现或者数组是否可以工作？）..我在Node.JS中看到了一些代码，但我无法弄清楚如何在C＃中转换代码。

public class QnaDialog : QnAMakerDialog
{
    public QnaDialog() : base(
        new QnAMakerService(new QnAMakerAttribute(ConfigurationManager.AppSettings["QnaSubscriptionKey1"],
        ConfigurationManager.AppSettings["QnaKnowledgebaseId1"], "Hmm, I wasn't able to find an article about that. Can you try asking in a different way?", 0.5)),

        new QnAMakerService(new QnAMakerAttribute(ConfigurationManager.AppSettings["QnaSubscriptionKey2"],
        ConfigurationManager.AppSettings["QnaKnowledgebaseId2"], "Hmm, I wasn't able to find an article about that. Can you try asking in a different way?", 0.5)),

        new QnAMakerService(new QnAMakerAttribute(ConfigurationManager.AppSettings["QnaSubscriptionKey3"],
        ConfigurationManager.AppSettings["QnaKnowledgebaseId4"], "Hmm, I wasn't able to find an article about that. Can you try asking in a different way?", 0.5))
        )
    {
    }
}

Answer 1

您可以通过在属性中提供多项服务，在单个机器人中使用多个QnAMaker知识库。

使用Nuget包QnAMakerDialog中的BotBuilder.CognitiveServices的基本实现是：

[Serializable]
[QnAMaker("QnaSubscriptionKey1", "QnaKnowledgebaseId1", "Hmm, I wasn't able to find an article about that. Can you try asking in a different way?", 0.50, 3)]
[QnAMaker("QnaSubscriptionKey2", "QnaKnowledgebaseId2", "Hmm, I wasn't able to find an article about that. Can you try asking in a different way?", 0.5, 3)]
[QnAMaker("QnaSubscriptionKey3", "QnaKnowledgebaseId3", "Hmm, I wasn't able to find an article about that. Can you try asking in a different way?", 0.5, 3)]
public class RootDialog : QnAMakerDialog
{
}

但是（是的，有一个“但是”）在某些情况下，您在处理邮件时可能会遇到异常。由于QnAMakerDialog是开源的（来源为here），您可以在MessageReceivedAsync中轻松发现问题出在服务调用返回的实现中：

var sendDefaultMessageAndWait = true;
qnaMakerResults = tasks.FirstOrDefault(x => x.Result.ServiceCfg != null)?.Result;
if (tasks.Count(x => x.Result.Answers?.Count > 0) > 0)
{
    var maxValue = tasks.Max(x => x.Result.Answers[0].Score);
    qnaMakerResults = tasks.First(x => x.Result.Answers[0].Score == maxValue).Result;

    if (qnaMakerResults != null && qnaMakerResults.Answers != null && qnaMakerResults.Answers.Count > 0)
    {
        if (this.IsConfidentAnswer(qnaMakerResults))
        {
            await this.RespondFromQnAMakerResultAsync(context, message, qnaMakerResults);
            await this.DefaultWaitNextMessageAsync(context, message, qnaMakerResults);
        }
        else
        {
            feedbackRecord = new FeedbackRecord { UserId = message.From.Id, UserQuestion = message.Text };
            await this.QnAFeedbackStepAsync(context, qnaMakerResults);
        }

        sendDefaultMessageAndWait = false;
    }
}

if (sendDefaultMessageAndWait)
{
    await context.PostAsync(qnaMakerResults.ServiceCfg.DefaultMessage);
    await this.DefaultWaitNextMessageAsync(context, message, qnaMakerResults);
}

在此代码中，如果您的所有服务都没有针对您的问题的答案，则此行代码将中断（即：如果您的QnAMaker KB中至少有一个没有针对您的问题的答案）

tasks.Max(x => x.Result.Answers[0].Score);

解决方法：您可以通过获取源代码并修复此方法来实现您自己的QnAMakerDialog，例如：

public async Task MessageReceivedAsync(IDialogContext context, IAwaitable<IMessageActivity> argument)
{
    var message = await argument;

    if (message != null && !string.IsNullOrEmpty(message.Text))
    {
        var tasks = this.services.Select(s => s.QueryServiceAsync(message.Text)).ToArray();
        await Task.WhenAll(tasks);

        if (tasks.Any())
        {
            var sendDefaultMessageAndWait = true;
            qnaMakerResults = tasks.FirstOrDefault(x => x.Result.ServiceCfg != null)?.Result;

            var qnaMakerFoundResults = tasks.Where(x => x.Result.Answers.Any()).ToList();
            if (qnaMakerFoundResults.Any())
            {
                var maxValue = qnaMakerFoundResults.Max(x => x.Result.Answers[0].Score);
                qnaMakerResults = qnaMakerFoundResults.First(x => x.Result.Answers[0].Score == maxValue).Result;

                if (qnaMakerResults?.Answers != null && qnaMakerResults.Answers.Count > 0)
                {
                    if (this.IsConfidentAnswer(qnaMakerResults))
                    {
                        await this.RespondFromQnAMakerResultAsync(context, message, qnaMakerResults);
                        await this.DefaultWaitNextMessageAsync(context, message, qnaMakerResults);
                    }
                    else
                    {
                        feedbackRecord = new FeedbackRecord { UserId = message.From.Id, UserQuestion = message.Text };
                        await this.QnAFeedbackStepAsync(context, qnaMakerResults);
                    }

                    sendDefaultMessageAndWait = false;
                }
            }

            if (sendDefaultMessageAndWait)
            {
                await context.PostAsync(qnaMakerResults.ServiceCfg.DefaultMessage);
                await this.DefaultWaitNextMessageAsync(context, message, qnaMakerResults);
            }
        }
    }
}