c# - 将 JSON 请求转换为 C# 对象并以不同的 JSON 格式发送回响应

Question

我正在调用网络服务并获得以下 Json 请求

{"handler":{"name":"abc"},"intent":{"name":"actions.intent.MAIN","params":{},"query":"Mit Google sprechen"},"scene":{"name":"actions.scene.START_CONVERSATION","slotFillingStatus":"UNSPECIFIED","slots":{},"next":{"name":"Start_Frage"}},"session":{"id":"ABwppHHVumDrliLJaLSikS6KnIlN7yYv6Z4XJCOYzEZt8Fr08RH6r0wtM2-E0v40lS2p1YosTDfpSCd5Lw","params":{},"typeOverrides":[],"languageCode":""},"user":{"locale":"de-DE","params":{},"accountLinkingStatus":"ACCOUNT_LINKING_STATUS_UNSPECIFIED","verificationStatus":"VERIFIED","packageEntitlements":[],"gaiamint":"","permissions":[],"lastSeenTime":"2021-04-01T10:06:59Z"},"home":{"params":{}},"device":{"capabilities":["SPEECH","RICH_RESPONSE","LONG_FORM_AUDIO"]}}

我使用https://json2csharp.com/将我的 Json 字符串转换为 C# 类

 public class Handler
    {
        public string name { get; set; }
    }

    public class Params
    {
    }

    public class Intent
    {
        public string name { get; set; }
        public Params @params { get; set; }
        public string query { get; set; }
    }

    public class Slots
    {
    }

    public class Next
    {
        public string name { get; set; }
    }

    public class Scene
    {
        public string name { get; set; }
        public string slotFillingStatus { get; set; }
        public Slots slots { get; set; }
        public Next next { get; set; }
    }

    public class Session
    {
        public string id { get; set; }
        public Params @params { get; set; }
        public List<object> typeOverrides { get; set; }
        public string languageCode { get; set; }
    }

    public class User
    {
        public string locale { get; set; }
        public Params @params { get; set; }
        public string accountLinkingStatus { get; set; }
        public string verificationStatus { get; set; }
        public List<object> packageEntitlements { get; set; }
        public string gaiamint { get; set; }
        public List<object> permissions { get; set; }
        public DateTime lastSeenTime { get; set; }
    }

    public class Home
    {
        public Params @params { get; set; }
    }

    public class Device
    {
        public List<string> capabilities { get; set; }
    }

    public class RequestJson
    {
        public Handler handler { get; set; }
        public Intent intent { get; set; }
        public Scene scene { get; set; }
        public Session session { get; set; }
        public User user { get; set; }
        public Home home { get; set; }
        public Device device { get; set; }
    }

我需要发回以这种方式格式化的 JSON 响应

{"responseJson": {"session": {"id": "ABwppHF4mhTR8RAjnFSt7me_NFR1hRKHY5N6X0kfONIcz_VVPUOmR8VddWVJ3GM3G8ix3OR3O1Ew2wbldc5cRziYebVA","params": {},"languageCode": ""},"prompt": {"override": false,"firstSimple": {"speech": "Stellen Sie eine Frage","text": ""}}}}

https://json2csharp.com/导致这个对象结构

    public class Params
    {
    }

    public class Session
    {
        public string id { get; set; }
        public Params @params { get; set; }
        public string languageCode { get; set; }
    }

    public class FirstSimple
    {
        public string speech { get; set; }
        public string text { get; set; }
    }

    public class Prompt
    {
        public bool @override { get; set; }
        public FirstSimple firstSimple { get; set; }
    }

    public class ResponseJson
    {
        public Session session { get; set; }
        public Prompt prompt { get; set; }
    }
}

我当前的代码如下所示：如果我这样做，我会得到一个 nullreferenceexception。我无法在 RespondJson 对象中设置任何值。我是编程新手。我将非常感谢您的帮助

[HttpPost]
public async Task<IActionResult> PostWebHook([FromBody] RequestJson request)
{

    ResponseJson response = new ResponseJson();
    string body;
    using (var reader = new StreamReader(Request.Body))
    {
        body = await reader.ReadToEndAsync();
        // => doesnt work that way I get a nullreferenceexception
        response.session.id = request.session.id; //nullreferenceexception
        response.prompt.@override = false;
        response.prompt.firstSimple.speech = "Test123";
        //
      
    }

    return Ok(response);
}

}

我该怎么做？简而言之：我收到 JSON 格式的请求，但稍后我需要以另一种 JSON 格式发回响应。

标签： c#asp.netjsonjson.netdeserialization

Answer 1

最好的方法是有两个独立的模型。一个预请求，每个响应第二个。当然，您可以在两个模型中重用一些类。在您的 json 中，您可以重用会话对象，然后您必须创建代表提示对象的新类。您的响应对象示例：

  public class Params
    {
    }

    public class Session
    {
        [JsonPropertyName("id")]
        public string Id { get; set; }

        [JsonPropertyName("params")]
        public Params Params { get; set; }

        [JsonPropertyName("languageCode")]
        public string LanguageCode { get; set; }
    }

    public class FirstSimple
    {
        [JsonPropertyName("speech")]
        public string Speech { get; set; }

        [JsonPropertyName("text")]
        public string Text { get; set; }
    }

    public class Prompt
    {
        [JsonPropertyName("override")]
        public bool Override { get; set; }

        [JsonPropertyName("firstSimple")]
        public FirstSimple FirstSimple { get; set; }
    }

    public class ResponseJson
    {
        [JsonPropertyName("session")]
        public Session Session { get; set; }

        [JsonPropertyName("prompt")]
        public Prompt Prompt { get; set; }
    }

    public class Response
    {
        [JsonPropertyName("responseJson")]
        public ResponseJson ResponseJson { get; set; }
    }