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在单个BOT中使用。如何使用C＃来实现。我最初的想法是将KB ID和Sub Key放入数组中（如何实现该数组或数组是否起作用？）。我在Node.JS中看到了一些代码，但无法弄清楚如何在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

QnAMaker通过在属性中提供多种服务，您可以在单个bot中使用多种知识库。

使用QnAMakerDialogNuget包的基本实现BotBuilder.CognitiveServices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，您在处理消息时可能会遇到异常。正如QnAMakerDialog开源的一样（您可以在此处找到源代码），您可以轻松地发现问题出在服务调用返回的实现中MessageReceivedAsync：

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，如果并非所有服务都对您的问题有答案（例如：如果您的QnAMaker KB至少有一个没有对您的问题的回答），则此行代码将中断。

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

解决方法：例如，您可以通过获取源代码并修复如下方法来实现自己的QnAMakerDialog：

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);

            }

        }

    }

}