c# - Newtonsoft JSON 反序列化使用 HttpWebResponse

Question

我正在搜索有关使用 Newtonsfot Json Converter 反序列化的所有问题。但是我无法在我的代码中找到问题。所以我放在这里，寻求帮助。

来自visual studio的消息错误:

No se controló Newtonsoft.Json.JsonSerializationException HResult=-2146233088 Message=Cannot deserialize the current JSON array (e.g. [1,2,3]) into type 'APIEffilogics.Usuari+Client' because the type requires a JSON object (e.g. {"name":"value"}) to deserialize correctly. To fix this error either change the JSON to a JSON object (e.g. {"name":"value"}) or change the deserialized type to an array or a type that implements a collection interface (e.g. ICollection, IList) like List that can be deserialized from a JSON array. JsonArrayAttribute can also be added to the type to force it to deserialize from a JSON array.

我的 JSON 响应是这样的:

[  {
  "id": 32,
  "consultancy_id": 1,
  "nif": "B61053922",
  "contactname": "",
  "email": "",
  "phone": "",
  "active": true,
  "description": "Keylab"   },   
{
  "id": 19,
  "consultancy_id": 1,
  "nif": "P0818300F",
  "contactname": "Pau Lloret",
  "email": "lloret@citcea.upc.edu",
  "phone": "",
  "active": true,
  "description": "Rubi"   } ]

这些是类:

namespace APIEffilogics
{
    public class Usuari
    {
        public string access_token;    //Encapsulat que conté la identificació de seguretat
        public string token_type;      //Tipus de token, "Bearer"
        public string response;        //Resposta de l'API

        public class Client : Usuari    //Estructura client
        {
            [JsonProperty("id")]
            public string cid { get; set; }
            [JsonProperty("consultancy_id")]
            public string consultancy_id { get; set; }
            [JsonProperty("contactname")]
            public string contactname { get; set; }
            [JsonProperty("email")]
            public string email { get; set; }
            [JsonProperty("description")]
            public string description { get; set; }
            [JsonProperty("nif")]
            public string nif { get; set; }
            [JsonProperty("phone")]
            public string phone { get; set; }
            [JsonProperty("active")]
            public string active { get; set; }
        }
        public class Building : Usuari  //Estructura edifici
        {
            public string descrip;
            public string bid;
        }
        public class Floor : Usuari     //Estructura planta
        {
            public string descrip;
            public string fid;
        }
        public class Room : Usuari      //Estructura habitació
        {
            public string descrip;
            public string rid;
        }
        public class Node : Usuari      //Estructura nodes
        {
            public string[] descrip;
            public string[] nid;
            public string[] model;
            public string[] type;
        }
    }
 //************************END PUBLIC CLASS Usuari***************************//
}

我使用的代码:

public void Request(string url, string metode)
{
   try
   {
      //Enviem la petició a la URL especificada i configurem el tipus de connexió
      HttpWebRequest myReq = (HttpWebRequest)WebRequest.Create(url);

      myReq.KeepAlive = true;
      myReq.Headers.Set("Cache-Control", "no-store");
      myReq.Headers.Set("Pragma", "no-cache");
      myReq.Headers.Set("Authorization", usuari.token_type + " " + usuari.access_token);

      if (metode.Equals("GET") || metode.Equals("POST"))
      {
           myReq.Method = metode;  // Set the Method property of the request to POST or GET.
           if (body == true)
           {
               // add request body with chat search filters
              List<paramet> p = new List<paramet>();
              paramet p1 = new paramet();
              p1.value = "1";
              string jsonBody = JsonConvert.SerializeObject(p1);
              var requestBody = Encoding.UTF8.GetBytes(jsonBody);
              myReq.ContentLength = requestBody.Length;
              myReq.ContentType = "application/json";
              using (var stream = myReq.GetRequestStream())
              {
                  stream.Write(requestBody, 0, requestBody.Length);
              }
              body = false;
           }
      }
      else throw new Exception("Invalid Method Type");

      //Obtenim la resposta del servidor
      HttpWebResponse myResponse = (HttpWebResponse)myReq.GetResponse();
      Stream rebut = myResponse.GetResponseStream();
      StreamReader readStream = new StreamReader(rebut, Encoding.UTF8); // Pipes the stream to a higher level stream reader with the required encoding format. 
      string info = readStream.ReadToEnd();
      var jsondata = JsonConvert.DeserializeObject<Usuari.Client>(info);

       myResponse.Close();
       readStream.Close();*/
    }
    catch (WebException ex)
    {
       // same as normal response, get error response
       var errorResponse = (HttpWebResponse)ex.Response;
       string errorResponseJson;
       var statusCode = errorResponse.StatusCode;
       var errorIdFromHeader = errorResponse.GetResponseHeader("Error-Id");
       using (var responseStream = new StreamReader(errorResponse.GetResponseStream()))
       {
           errorResponseJson = responseStream.ReadToEnd();
       }
     }
}

我不知道问题出在哪里，响应具有正确的 JSON 方案。有人可以向我解释我的代码中的问题在哪里，或者我是否做得不正确。

我已经解决了你所说的问题，现在我遇到了类似的问题和相同的消息错误。现在的 JSON 响应是这样的:{

    nodes: [
      {
        id: 5,
        global_id: 5,
        description: "Oven",
        room_id: 2,
        floor_id: 1,
        building_id: 1,
        client_id: 2,
        nodemodel_id: 2,
        nodetype_id: 1
      },
      {
        id: 39,
        global_id: 39,
        description: "Fridge",
        room_id: 2,
        floor_id: 1,
        building_id: 1,
        client_id: 2,
        nodemodel_id: 8,
        nodetype_id: 1
      }, ...
    ],
    limit: 10,
    offset: 0
}

这些是类:

public class Node : Usuari      //Estructura nodes
{            
   [JsonProperty("limit")]
   public int limit { get; set; }
   [JsonProperty("offset")]
   public int offset { get; set; }
   [JsonProperty("nodes")]
   public List<Node_sub> nodes_sub { get; set; }
}
public class Node_sub : Node
{
    [JsonProperty("id")]
    public string nid { get; set; }
    [JsonProperty("global_id")]
    public string gid { get; set; }
    [JsonProperty("description")]
    public string descrip { get; set; }
    [JsonProperty("room_id")]
    public string rid { get; set; }
    [JsonProperty("floor_id")]
    public string fid { get; set; }
    [JsonProperty("client_id")]
    public string cid { get; set; }
    [JsonProperty("building_id")]
    public string bid { get; set; }
    [JsonProperty("nodemodel_id")]
    public string model { get; set; }
    [JsonProperty("nodetype_id")]
    public string type { get; set; }
}

代码和之前一样，只是我加了这句话:

jsonnode = JsonConvert.DeserializeObject<List<Usuari.Node>>(info);

为什么我有同样的错误？ List<Usuari.Node>是一个数组，包含了 JSON 消息的所有项。

谢谢

Answer 1

尝试

var jsondata = JsonConvert.DeserializeObject<List<Usuari.Client>>(info);

这解决了异常提示的问题:

To fix this error either change the JSON to a JSON object (e.g. {"name":"value"}) or change the deserialized type to an array or a type that implements a collection interface (e.g. ICollection, IList) like List that can be deserialized from a JSON array

强调是为了突出重点

您收到的 HTTP 响应是一个对象数组，因此您需要以一种可以处理对象数组的方式对其进行反序列化。通过更改代码以反序列化为 List<Usari.Client>你这样做，它应该可以解决错误。