我正在使用RESTful JSON API，并且正在尝试使用Newtonsoft的JSON.Net框架反序列化JSON响应消息的PART。
基本上，我收到的响应JSON消息包括标题信息以及项目数组（卡片）。当我尝试反序列化到一个卡列表时，抛出一个.JsonSerializationException。
我几乎可以肯定这是因为.DeserializeObject方法在标题信息上绊倒了。为了测试这个理论，我'按摩了'JSON响应消息＆amp;删除了标题信息;将剩余的JSON保存为字符串＆amp;将它传递给Deserialize方法，＆amp;它有效！
我的问题是 - 是否可以将.DeserializeObject方法传递给参数＆amp;强制它对ONL反序列化JSON响应的数据组件？
代码：
public List<Cards.CardResponse> GetByUserToken(string UserToken)
{
string requestUrl = URL + "/user/" + UserToken;
HttpWebRequest request =(HttpWebRequest)WebRequest.Create(requestUrl);
request.Method = "GET";
request.ContentType = "application/json";
String encoded = System.Convert.ToBase64String(System.Text.Encoding.GetEncoding("ISO-8859-1").GetBytes(username + ":" + password));
request.Headers.Add("Authorization", "Basic " + encoded);
List<Cards.CardResponse> ReturnCards = null;
try
{
// Get JSON response message
string jsonResponse = string.Empty;
HttpWebResponse ws = (HttpWebResponse)request.GetResponse();
using (System.IO.StreamReader sreader = new System.IO.StreamReader(ws.GetResponseStream()))
{
jsonResponse = sreader.ReadToEnd();
}
// *** THE LINE BELOW THROWS THE ERROR:
ReturnCards = (List<Cards.CardResponse>)JsonConvert.DeserializeObject(jsonResponse, typeof(List<Cards.CardResponse>));**
return ReturnCards;
错误讯息：
Newtonsoft.Json.dll中出现类型为“Newtonsoft.Json.JsonSerializationException”的未处理异常
其他信息：
无法反序列化当前的JSON对象（例如{“name”：“value”}） 进入类型 'System.Collections.Generic.List`1 [ExpenseWorks.Marqeta.Cards + CardResponse]' 因为该类型需要一个JSON数组（例如[1,2,3]）来反序列化 正确。
要修复此错误，请将JSON更改为JSON数组（例如 [1,2,3]）或更改反序列化类型，使其成为正常的.NET type（例如，不是像整数这样的基本类型，不是集合类型 像数组或List一样，可以从JSON对象反序列化。 JsonObjectAttribute也可以添加到类型中以强制它 从JSON对象反序列化。
原始JSON：
我还包括原始JSON响应 - 基本上，我想弄清楚如何仅从'数据'开始反序列化：
{
"count": 5,
"start_index": 0,
"end_index": 4,
"is_more": true,
"data": [{
"token": "9bd70529-f84a-406e-ad68-eabf69af690f",
"pan": "******______****",
"expiration": "0219",
"state": "UNACTIVATED",
"user_token": "2dea06b1-9fc8-423c-bb5b-b733ec895b38",
"card_product_token": "dfd110cf-a833-4b21-b7c1-b3bc62b97c52",
"last_four": "7281",
"pin_is_set": false,
"state_reason": "New card",
"fulfillment_status": "ISSUED"
},
{
"token": "0ec53aef-768d-4499-a661-9e26172b8369",
"pan": "******______****",
"expiration": "0219",
"state": "UNACTIVATED",
"user_token": "2dea06b1-9fc8-423c-bb5b-b733ec895b38",
"card_product_token": "dfd110cf-a833-4b21-b7c1-b3bc62b97c52",
"last_four": "5216",
"pin_is_set": false,
"state_reason": "New card",
"fulfillment_status": "ISSUED"
},
{
"token": "82c8b386 -f4b6-40d9-bee6-dd0a5b74d55b",
"pan": "******______****",
"expiration": "0219",
"state": "UNACTIVATED",
"user_token": "2dea06b1-9fc8-423c-bb5b-b733ec895b38",
"card_product_token": "dfd110cf-a833-4b21-b7c1-b3bc62b97c52",
"last_four": "6640",
"pin_is_set": false,
"state_reason": "New card",
"fulfillment_status": "ISSUED"
},
{
"token": "1181f23d-b464-4af2-95d9-8b8f48c4d6a8",
"pan": "******______****",
"expiration": "0219",
"state": "UNACTIVATED",
"user_token": "2dea06b1-9fc8-423c-bb5b-b733ec895b38",
"card_product_token": "dfd110cf-a833-4b21-b7c1-b3bc62b97c52",
"last_four": "3390",
"pin_is_set": false,
"state_reason": "New card",
"fulfillment_status": "ISSUED"
},
{
"token": "21870467-b059-472e-a130-938356ff1f4a",
"pan": "******______****",
"expiration": "0219",
"state": "UNACTIVATED",
"user_token": "2dea06b1-9fc8-423c-bb5b-b733ec895b38",
"card_product_token": "dfd110cf-a833-4b21-b7c1-b3bc62b97c52",
"last_four": "7387",
"pin_is_set": false,
"state_reason": "New card",
"fulfillment_status": "ISSUED"
}]
}
答案 0 :(得分：2)
您可以先将其反序列化为JObject，然后提取所需的部分：
var json = JObject.Parse(jsonString);
var partialJsonString = JsonConvert.SerializeObject(json["data"]);
var yourObject = JsonConvert.DeserializeObject<YourType>(partialJsonString );
然而，为所有事情创建课程非常简单：
public class ReplyRoot
{
public int count { get; set; }
public int start_index { get; set; }
public int end_index { get; set; }
public int is_more { get; set; }
public DataEntry[] data { get; set; }
}
public class DataEntry
{
public string token { get; set; }
// [.. all properties ..]
}
var dto = JsonConvert.DeserializeObject<ReplyRoot>(jsonString);
答案 1 :(得分：0)
您可以创建一个新类来保存整个JSON对象
public class CardResponseWrapper
{
public int count { get; set; }
public int startIndex { get; set; }
public int endIndex { get; set; }
public bool is_more { get; set; }
public List<Cards.CardResponse> data { get; set; }
}
然后将请求的结果转换为此对象：
var result = (CardResponseWrapper)JsonConvert.DeserializeObject(jsonResponse, typeof(CardResponseWrapper));
这是你的json格式：
{
"count": 5,
"start_index": 0,
"end_index": 4,
"is_more": true,
"data": [{
"token": "9bd70529-f84a-406e-ad68-eabf69af690f",
"pan": "******______****",
"expiration": "0219",
"state": "UNACTIVATED",
"user_token": "2dea06b1-9fc8-423c-bb5b-b733ec895b38",
"card_product_token": "dfd110cf-a833-4b21-b7c1-b3bc62b97c52",
"last_four": "7281",
"pin_is_set": false,
"state_reason": "New card",
"fulfillment_status": "ISSUED"
}, {
"token": "0ec53aef-768d-4499-a661-9e26172b8369",
"pan": "******______****",
"expiration": "0219",
"state": "UNACTIVATED",
"user_token": "2dea06b1-9fc8-423c-bb5b-b733ec895b38",
"card_product_token": "dfd110cf-a833-4b21-b7c1-b3bc62b97c52",
"last_four": "5216",
"pin_is_set": false,
"state_reason": "New card",
"fulfillment_status": "ISSUED"
}, {
"token": "82c8b386 -f4b6-40d9-bee6-dd0a5b74d55b",
"pan": "******______****",
"expiration": "0219",
"state": "UNACTIVATED",
"user_token": "2dea06b1-9fc8-423c-bb5b-b733ec895b38",
"card_product_token": "dfd110cf-a833-4b21-b7c1-b3bc62b97c52",
"last_four": "6640",
"pin_is_set": false,
"state_reason": "New card",
"fulfillment_status": "ISSUED"
}, {
"token": "1181f23d-b464-4af2-95d9-8b8f48c4d6a8",
"pan": "******______****",
"expiration": "0219",
"state": "UNACTIVATED",
"user_token": "2dea06b1-9fc8-423c-bb5b-b733ec895b38",
"card_product_token": "dfd110cf-a833-4b21-b7c1-b3bc62b97c52",
"last_four": "3390",
"pin_is_set": false,
"state_reason": "New card",
"fulfillment_status": "ISSUED"
}, {
"token": "21870467-b059-472e-a130-938356ff1f4a",
"pan": "******______****",
"expiration": "0219",
"state": "UNACTIVATED",
"user_token": "2dea06b1-9fc8-423c-bb5b-b733ec895b38",
"card_product_token": "dfd110cf-a833-4b21-b7c1-b3bc62b97c52",
"last_four": "7387",
"pin_is_set": false,
"state_reason": "New card",
"fulfillment_status": "ISSUED"
}]
}
答案 2 :(得分：-1)
如果这是你的Json：
{
\n\"count\": 5,
\n\"start_index\": 0,
\n\"end_index\": 4,
\n\"is_more\": true,
\n\"data\": [
{
\n\"token\": \"9bd70529-f84a-406e-ad68-eabf69af690f\",
\n\"pan\": \"******______****\",
\n\"expiration\": \"0219\",
\n\"state\": \"UNACTIVATED\",
\n\"user_token\": \"2dea06b1-9fc8-423c-bb5b-b733ec895b38\",
\n\"card_product_token\": \"dfd110cf-a833-4b21-b7c1-b3bc62b97c52\",
\n\"last_four\": \"7281\",
\n\"pin_is_set\": false,
\n\"state_reason\": \"Newcard\",
\n\"fulfillment_status\": \"ISSUED\"\n
},
{
\n\"token\": \"0ec53aef-768d-4499-a661-9e26172b8369\",
\n\"pan\": \"******______****\",
\n\"expiration\": \"0219\",
\n\"state\": \"UNACTIVATED\",
\n\"user_token\": \"2dea06b1-9fc8-423c-bb5b-b733ec895b38\",
\n\"card_product_token\": \"dfd110cf-a833-4b21-b7c1-b3bc62b97c52\",
\n\"last_four\": \"5216\",
\n\"pin_is_set\": false,
\n\"state_reason\": \"Newcard\",
\n\"fulfillment_status\": \"ISSUED\"\n
},
{
\n\"token\": \"82c8b386-f4b6-40d9-bee6-dd0a5b74d55b\",
\n\"pan\": \"******______****\",
\n\"expiration\": \"0219\",
\n\"state\": \"UNACTIVATED\",
\n\"user_token\": \"2dea06b1-9fc8-423c-bb5b-b733ec895b38\",
\n\"card_product_token\": \"dfd110cf-a833-4b21-b7c1-b3bc62b97c52\",
\n\"last_four\": \"6640\",
\n\"pin_is_set\": false,
\n\"state_reason\": \"Newcard\",
\n\"fulfillment_status\": \"ISSUED\"\n
},
{
\n\"token\": \"1181f23d-b464-4af2-95d9-8b8f48c4d6a8\",
\n\"pan\": \"******______****\",
\n\"expiration\": \"0219\",
\n\"state\": \"UNACTIVATED\",
\n\"user_token\": \"2dea06b1-9fc8-423c-bb5b-b733ec895b38\",
\n\"card_product_token\": \"dfd110cf-a833-4b21-b7c1-b3bc62b97c52\",
\n\"last_four\": \"3390\",
\n\"pin_is_set\": false,
\n\"state_reason\": \"Newcard\",
\n\"fulfillment_status\": \"ISSUED\"\n
},
{
\n\"token\": \"21870467-b059-472e-a130-938356ff1f4a\",
\n\"pan\": \"******______****\",
\n\"expiration\": \"0219\",
\n\"state\": \"UNACTIVATED\",
\n\"user_token\": \"2dea06b1-9fc8-423c-bb5b-b733ec895b38\",
\n\"card_product_token\": \"dfd110cf-a833-4b21-b7c1-b3bc62b97c52\",
\n\"last_four\": \"7387\",
\n\"pin_is_set\": false,
\n\"state_reason\": \"Newcard\",
\n\"fulfillment_status\": \"ISSUED\"\n
}
]\n
}
这不是一个有效的json解析。 您可以在http://jsonlint.com/
中对此进行验证