如何将字符串转换为 QnA Maker 返回的 JSON

Question

我目前需要创建一个脚本，该脚本需要通过匹配 excel 文件中的问题来更新 QnA Maker 中 qna 对的元数据。我目前正在遵循 REST API 指南：

https://docs.microsoft.com/en-us/azure/cognitive-services/qnamaker/quickstarts/csharp

我已经从 QnA Maker 中检索到 qna 对，但由于它返回了所有 qna 信息的字符串值，我需要将其转换为 JSON 并将其与我的 QnA 对象列表进行匹配从我的 excel 文件中检索。

 public async static Task<string> GetQnAFromQnAMaker()
        {
            string getmethod = "/knowledgebases/{0}/{1}/qna/";
            var method_with_id = String.Format(getmethod, kbid, env);
            var uri = host + service + method_with_id;
            Console.WriteLine("Calling " + uri + ".");
            var response = await Get(uri);

            return response;

        }

我使用了 NewtonSoft 反序列化对象

List<FAQs> qnaMakerFaq = JsonConvert.DeserializeObject<List<FAQs>>(qnaFromQnAMaker.Result);

但是我得到这个错误：

Newtonsoft.Json.JsonSerializationException: 'Cannot deserialize the current JSON object (e.g. {"name":"value"}) into type 'System.Collections.Generic.List`1[ExcelToQnAMaker.FAQs]' because the type requires a JSON array (e.g. [1,2,3]) to deserialize correctly. To fix this error either change the JSON to a JSON array (e.g. [1,2,3]) or change the deserialized type so that it is a normal .NET type (e.g. not a primitive type like integer, not a collection type like an array or List) that can be deserialized from a JSON object. JsonObjectAttribute can also be added to the type to force it to deserialize from a JSON object. Path 'qnaDocuments', line 2, position 17.'

我返回的结果字符串看起来像这样...

"{\r\n \"qnaDocuments\": [\r\n {\r\n \"id\": ....

这是我的常见问题解答Class

 public class FAQs
    {
        public List<string> Questions { get; set; }
        public string Answers { get; set; }
        public string Classification { get; set; }
        public string Division { get; set; }
        public int Spid { get; set; }
        public int Kbid { get; set; }
    }

Answer 1

如果您查看 Download Knowledgebase 的 API 文档，您得到的响应应该类似于

{
  "qnaDocuments": [
    {
      "id": 1,
      "answer": "You can change the default message if you use the QnAMakerDialog. See this for details: https://docs.botframework.com/en-us/azure-bot-service/templates/qnamaker/#navtitle",
      "source": "Custom Editorial",
      "questions": [
        "How can I change the default message from QnA Maker?"
      ],
      "metadata": []
    },
    {
      "id": 2,
      "answer": "You can use our REST apis to manage your KB. See here for details: https://westus.dev.cognitive.microsoft.com/docs/services/58994a073d9e04097c7ba6fe/operations/58994a073d9e041ad42d9baa",
      "source": "Custom Editorial",
      "questions": [
        "How do I programmatically update my KB?"
      ],
      "metadata": [
        {
          "name": "category",
          "value": "api"
        }
      ]
    }
  ]
}

您尝试反序列化的模型应该匹配此结构...

public class KnowledgebaseResponse
{
    public List<KnowledgebaseItem> QnaDocuments { get; set; }
}

public class KnowledgebaseItem
{
    public int Id { get; set; }
    public string Answer { get; set; }
    public string Source { get; set; }
    public List<string> Questions { get; set; }
    public List<KeyValuePair<string, string>> MetaData { get; set; }
}

然后您可以正确反序列化 JSON。

如果您随后想对最终模型进行一些映射，则必须将其作为额外步骤进行。

如何将字符串转换为 QnA Maker 返回的 JSON

How to convert string to JSON returned by QnA Maker

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