将QnAMaker示例与QnAMakerDialog一起使用时出错

Question

我一直在尝试使用QnAMaker API创建类使用Microsoft Cognitive和AI工具包的构造函数，以创建一个简单的聊天机器人。

虽然我的普通qnaMakerAi聊天机器人工作正常，但在我尝试增​​强它的功能并包含构造函数时会出现问题。 在模拟器中运行代码时，我得到以下错误：

消息：对不起，我的机器人代码出了问题。 POST：500 directline.postActivity

我遇到的问题是： ＆＃34;对象引用未设置为对象的实例。＆＃34;

请检查并建议。

根据用户评论，这是RootDialog的代码 - `

命名空间Microsoft.Bot.Sample.QnABot {

 [Serializable]
public class RootDialog : QnAMakerDialog        //IDialog<object>
{
    public async Task StartAsync(IDialogContext context)
    {
        /* Wait until the first message is received from the conversation and call MessageReceviedAsync 
        *  to process that message. */
        context.Wait(this.MessageReceivedAsync);
    }

    public RootDialog() : base(new QnAMakerService(new QnAMakerAttribute(ConfigurationManager.AppSettings["QnASubscriptionKey"], ConfigurationManager.AppSettings["QnAKnowledgebaseId"], "Sorry, I couldn't find an answer for that")))
    {
    }
    protected override async Task RespondFromQnAMakerResultAsync(IDialogContext context, IMessageActivity message, QnAMakerResults result)
    {
    }
    private async Task MessageReceivedAsync(IDialogContext context, IAwaitable<IMessageActivity> result)
    {
        /* When MessageReceivedAsync is called, it's passed an IAwaitable<IMessageActivity>. To get the message,
         *  await the result. */
        var message = await result;
       // var qnaAuthKey = Utils.GetAppSetting("QnAAuthKey");
            var qnaAuthKey = GetSetting("QnAAuthKey");
        // var qnaKBId = Utils.GetAppSetting("QnAKnowledgebaseId");
        // var endpointHostName = Utils.GetAppSetting("QnAEndpointHostName");
        var qnaKBId = ConfigurationManager.AppSettings["QnAKnowledgebaseId"];
         var endpointHostName = ConfigurationManager.AppSettings["QnAEndpointHostName"];

        // QnA Subscription Key and KnowledgeBase Id null verification
        if (!string.IsNullOrEmpty(qnaAuthKey) && !string.IsNullOrEmpty(qnaKBId))
        {
            // Forward to the appropriate Dialog based on whether the endpoint hostname is present
            if (string.IsNullOrEmpty(endpointHostName))
                await context.Forward(new BasicQnAMakerPreviewDialog(), AfterAnswerAsync, message, CancellationToken.None);
            else
                await context.Forward(new BasicQnAMakerDialog(), AfterAnswerAsync, message, CancellationToken.None);
        }
        else
        {
            await context.PostAsync("Please set QnAKnowledgebaseId, QnAAuthKey and QnAEndpointHostName (if applicable) in App Settings. Learn how to get them at https://aka.ms/qnaabssetup.");
        }

    }

    private async Task AfterAnswerAsync(IDialogContext context, IAwaitable<IMessageActivity> result)
    {
        // wait for the next user message
        context.Wait(MessageReceivedAsync);
    }

    public static string GetSetting(string key)
    {
        var value = ConfigurationManager.AppSettings[key];
        if (String.IsNullOrEmpty(value) && key == "QnAAuthKey")
        {
            value = ConfigurationManager.AppSettings["QnASubscriptionKey"]; // QnASubscriptionKey for backward compatibility with QnAMaker (Preview)
        }
        return value;
    }
}

// Dialog for QnAMaker Preview service
[Serializable]
public class BasicQnAMakerPreviewDialog : QnAMakerDialog
{
    // Go to https://qnamaker.ai and feed data, train & publish your QnA Knowledgebase.
    // Parameters to QnAMakerService are:
    // Required: subscriptionKey, knowledgebaseId, 
    // Optional: defaultMessage, scoreThreshold[Range 0.0 – 1.0]
    public BasicQnAMakerPreviewDialog() : base(new QnAMakerService(new QnAMakerAttribute(RootDialog.GetSetting("QnAAuthKey"), ConfigurationManager.AppSettings["QnAKnowledgebaseId"], "No good match in FAQ.", 0.5)))
    { }
}

// Dialog for QnAMaker GA service
[Serializable]
public class BasicQnAMakerDialog : QnAMakerDialog
{
    // Go to https://qnamaker.ai and feed data, train & publish your QnA Knowledgebase.
    // Parameters to QnAMakerService are:
    // Required: qnaAuthKey, knowledgebaseId, endpointHostName
    // Optional: defaultMessage, scoreThreshold[Range 0.0 – 1.0]
    public BasicQnAMakerDialog() : base(new QnAMakerService(new QnAMakerAttribute(RootDialog.GetSetting("QnAAuthKey"), ConfigurationManager.AppSettings["QnAKnowledgebaseId"], "No good match in FAQ.", 0.5, 1, ConfigurationManager.AppSettings["QnAEndpointHostName"])))
    { }

}}

`

对于RootDialog -

Answer 1

  

我遇到的问题是：＆＃34;对象引用未设置为对象的实例。＆＃34;

根据您提供的代码，我可以重现该问题。您似乎使用问题和答案（c＃）模板创建Bot服务并从Azure门户下载源代码，然后修改代码以使RootDialog继承QnAMakerDialog类。正如Eric Dahlvang在评论中提到的，如果你检查QnAMakerDialog的定义，你会发现RootDialog的实现是无效的。

此外，根据我的测试，如果您使用 GA QnAMaker服务的 QnAKnowledgebaseId 来启动您的QnAMakerDialog，但不提供< strong> QnAEndpointHostName ，异常将是thorwn。

注意： 有关GA QnAMaker服务的详细信息，请参阅this blog。

Answer 2

我无法理解你在哪里得到错误。

只是建议您也可以尝试这样做

 using Microsoft.Bot.Builder.CognitiveServices.QnAMaker;
    namespace Test.Qna
    {
        [Serializable]
        [QnAMaker(authKey: "AuthKey", knowledgebaseId: "KnowledgebaseId", defaultMessage: "please rephrase, I could not understand.", scoreThreshold: 0.5, top: 1, endpointHostName: "https://yourAccount.azurewebsites.net/qnamaker")]
        public class QnADialog : QnAMakerDialog
        {
        }
    }

Answer 3

如果要在方法之外创建任何对象，请尝试在方法内部创建对象。例如

class1 myclass1 = new class1();

public string void MyMethod()
{

}

//above line might be an error.

//do it as



public string void MyMethod()
{
class1 myclass1 = new class1();
}