无法将Json解析为.NET类

Question

鉴于：

这些课程：

public class Venue
{
    [JsonProperty("id")]
    public string Id { get; set; }
    [JsonProperty("name")]
    public string Name { get; set; }
    [JsonProperty("location")]
    public Location Location { get; set; }
}

public class Location
{
    public long Lat { get; set; }
    public long Lng { get; set; }
    public int Distance { get; set; }
    public string City { get; set; }
    public string State { get; set; }
    public string Country { get; set; }
}

public class Response
{
    private List<Venue> _venues;
    [JsonProperty("venues")]
    public List<Venue> Venues
    {
        get { return _venues ?? (_venues = new List<Venue>()); }
        set { _venues = value; }
    }
}

和一个响应请求：

   {
    "meta":{
      "code":200
   },
   "response":{
      "venues":[
         {
            "id":"4f96a5aee4b01cb74e4dc3c6",
            "name":"Centro",
            "contact":{
            },
            "location":{
               "address":"Centro",
               "lat":-21.256906640441052,
               "lng":-48.31978432813259,
               "distance":185,
               "city":"Jaboticabal",
               "state":"SP",
               "country":"Brazil",
               "cc":"BR"
            },
            "canonicalUrl":"https:\/\/foursquare.com\/v\/centro\/4f96a5aee4b01cb74e4dc3c6",
            "categories":[
               {
                  "id":"4f2a25ac4b909258e854f55f",
                  "name":"Neighborhood",
                  "pluralName":"Neighborhoods",
                  "shortName":"Neighborhood",
                  "icon":{
                     "prefix":"https:\/\/foursquare.com\/img\/categories_v2\/parks_outdoors\/neighborhood_",
                     "suffix":".png"
                  },
                  "primary":true
               }
            ],
            "verified":false,
            "restricted":true,
            "stats":{
               "checkinsCount":1106,
               "usersCount":86,
               "tipCount":0
            },
            "specials":{
               "count":0,
               "items":[
               ]
            },
            "hereNow":{
               "count":0,
               "groups":[
               ]
            },
            "referralId":"v-1376511204"
         },
         {
            "id":"4c38b0b21a38ef3b56b39221",
            "name":"Ice by Nice",
            "contact":{
            },
            "location":{
               "address":"Jaboticabal Shopping",
               "lat":-21.25513775,
               "lng":-48.32320093,
               "distance":253,
               "city":"Jaboticabal",
               "state":"SP",
               "country":"Brazil",
               "cc":"BR"
            },
            "canonicalUrl":"https:\/\/foursquare.com\/v\/ice-by-nice\/4c38b0b21a38ef3b56b39221",
            "categories":[
               {
                  "id":"4bf58dd8d48988d1c9941735",
                  "name":"Ice Cream Shop",
                  "pluralName":"Ice Cream Shops",
                  "shortName":"Ice Cream",
                  "icon":{
                     "prefix":"https:\/\/foursquare.com\/img\/categories_v2\/food\/icecream_",
                     "suffix":".png"
                  },
                  "primary":true
               }
            ],
            "verified":false,
            "restricted":true,
            "stats":{
               "checkinsCount":656,
               "usersCount":309,
               "tipCount":15
            },
            "specials":{
               "count":0,
               "items":[
               ]
            },
            "hereNow":{
               "count":2,
               "groups":[
                  {
                     "type":"others",
                     "name":"Other people here",
                     "count":2,
                     "items":[
                     ]
                  }
               ]
            },
            "referralId":"v-1376511204"
         }
      ]
   }
}

像这样使用JSON.NET时：

Response response = JsonConvert.DeserializeObject<Response>(jsonString);

反序列化的响应对象的场所列表为空，我在做什么错？

谢谢

Answer 1

您尝试反序列化的内容和您定义要反序列化的类之间存在一些不匹配。 不幸的是，您还需要间接的另一层。 注意响应有；

// theres an outer object here which contains response
{
     "meta":{ "code":200 }, 
     "response":{
         // you're trying to deserialize this, but it's not the entire response, it's a property of an anonymous object
     }
}

所以，如果我上一堂新课，

public class ResponseWrapper
{
      public object meta;
      public Response response;
}

而是做；

ResponseWrapper response = JsonConvert.DeserializeObject<ResponseWrapper>(jsonString);

然后它将起作用。

请注意，在使用json.NET反序列化时，必须定义一个与json完全匹配的结构。 在这种情况下，您将忽略最外面的对象。 这有点烦人，并且会导致产生很多代码，就像我刚才写的一样，但这有时就是这样。