JSON.net 反序列化返回一个空对象
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【中文标题】JSON.net 反序列化返回一个空对象【英文标题】：JSON.net deserialization returns a null object 【发布时间】：2015-11-11 01:16:03 【问题描述】：我正在尝试扩展 HelpScoutNet 项目，以便利用报告。我从 HelpScout 获得的 JSON 反序列化到我的类中，这真是太棒了。希望你们能告诉我我做错了什么。
根据 API 文档的 JSON：
"filterTags": [
"id": 123,
"name": "sample-tag"
,
...
],
"user":
"id": 4,
"hasPhoto": true,
"createdAt": "2010-09-03T15:55:48Z",
"name": "John Smith",
"totalCustomersHelped": 6580,
"photoUrl": "http://example.com/pic.jpg"
,
"current":
"startDate": "2015-01-01T00:00:00Z",
"endDate": "2015-01-31T23:59:59Z",
"totalDays": 30,
"resolved": 1,
"conversationsCreated": 15,
"closed": 3,
"totalReplies": 58,
"resolvedOnFirstReply": 0,
"percentResolvedOnFirstReply": 0.0,
"repliesToResolve": 2.0,
"handleTime": 78.96,
"happinessScore": 66.66666666666666,
"responseTime": 2278004,
"resolutionTime": 2278004.0,
"repliesPerDay": 1.9333333333333333,
"customersHelped": 26,
"totalConversations": 19,
"conversationsPerDay": 0.6333333333333333,
"busiestDay": 5
,
"previous":
"startDate": "2014-01-01T00:00:00Z",
"endDate": "2014-01-31T23:59:59Z",
"totalDays": 30,
"resolved": 12,
"conversationsCreated": 2,
"closed": 33,
"totalReplies": 40,
"resolvedOnFirstReply": 4,
"percentResolvedOnFirstReply": 0.3333333333333333,
"repliesToResolve": 2.1666666666666665,
"handleTime": 0.0,
"happinessScore": 23.529411764705884,
"responseTime": 2357169,
"resolutionTime": 4318101.5,
"repliesPerDay": 1.3333333333333333,
"customersHelped": 16,
"totalConversations": 42,
"conversationsPerDay": 0.4
,
"deltas":
"totalConversations": -54.761904761904766,
"customersHelped": 62.5,
"happinessScore": 43.13725490196077,
"repliesPerDay": 45.000000000000014,
"resolvedOnFirstReply": -100.0,
"handleTime": 0.0,
"conversationsPerDay": 58.33333333333333,
"resolved": -91.66666666666666,
"repliesToResolve": -7.692307692307687,
"activeConversations": -54.761904761904766,
"totalReplies": 44.99999999999999,
"closed": -90.9090909090909,
"responseTime": -3.3584779029420475,
"resolutionTime": -47.245241919394445,
"conversationsCreated": 650.0
我从 API 返回的 JSON：
"\"filterTags\":[\"name\":\"general questions\",\"id\":295508,\"name\":\"request/suggestion\",\"id\":372291,\"name\":\"support.dd.com incorrect\",\"id\":547376,\"name\":\"status update\",\"id\":295502,\"name\":\"support.dd.com other\",\"id\":547378,\"name\":\"promos/gift cards\",\"id\":295547],\"user\":\"createdAt\":\"2015-05-04T16:32:21Z\",\"photoUrl\":\"https://d33v4339jhl8k0.cloudfront.net/users/99999.23342.jpg\",\"hasPhoto\":true,\"name\":\"John Doe\",\"totalCustomersHelped\":261,\"id\":99999,\"current\":\"startDate\":\"2015-08-15T12:00:00Z\",\"endDate\":\"2015-08-16T18:00:00Z\",\"totalDays\":1,\"resolved\":4,\"conversationsCreated\":0,\"closed\":11,\"totalReplies\":5,\"resolvedOnFirstReply\":3,\"percentResolvedOnFirstReply\":60.0,\"repliesToResolve\":1.25,\"handleTime\":346.6,\"happinessScore\":0.0,\"responseTime\":3467,\"resolutionTime\":4704.25,\"repliesPerDay\":5.0,\"customersHelped\":4,\"totalConversations\":12,\"conversationsPerDay\":12.0,\"busiestDay\":6"
我的课程：
public class User
[DefaultValue(0)]
public int ID get; set;
public bool HasPhoto get; set;
[JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
[JsonConverter(typeof(IsoDateTimeConverter))]
public DateTime? CreatedAt get; set;
public string Name get; set;
public int TotalCustomersHelped get; set;
public string PhotoURL get; set;
public class TimeRangeStats
[JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
[JsonConverter(typeof(IsoDateTimeConverter))]
public DateTime? StartDate get; set;
[JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
[JsonConverter(typeof(IsoDateTimeConverter))]
public DateTime? EndDate get; set;
public int TotalDays get; set;
public int Resolved get; set;
public int ConversationsCreated get; set;
public int Closed get; set;
public int TotalReplies get; set;
public int ResolvedOnFirstReply get; set;
public double PercentResolvedOnFirstReply get; set;
public double RepliesToResolve get; set;
public double HandleTime get; set;
public double HappinessScore get; set;
public double ResponseTime get; set;
public double ResolutionTime get; set;
public double RepliesPerDay get; set;
public int CustomersHelped get; set;
public int TotalConversations get; set;
public double ConversationsPerDay get; set;
public int BusiestDay get; set;
public class MultipleTimeRangeStats
public double TotalConversations get; set;
public double CustomersHelped get; set;
public double HappinessScore get; set;
public double RepliesPerDay get; set;
public double ResolvedOnFirstReply get; set;
public double HandleTime get; set;
public double ConversationsPerDay get; set;
public double Resolved get; set;
public double RepliesToResolve get; set;
public double ActiveConversations get; set;
public double TotalReplies get; set;
public double Closed get; set;
public double ResponseTime get; set;
public double ResolutionTime get; set;
public double ConversationsCreated get; set;
public class Tag
public string Name get; set;
[DefaultValue(0)]
public long ID get; set;
public class UserReport
public List<Tag> FilterTags get; set;
public User User get; set;
public TimeRangeStats Current get; set;
public TimeRangeStats Previous get; set;
public MultipleTimeRangeStats Deltas get; set;
序列化器设置：
private JsonSerializerSettings _serializerSettings
get
var serializer = new JsonSerializerSettings
ContractResolver = new CamelCasePropertyNamesContractResolver(),
NullValueHandling = NullValueHandling.Ignore,
DefaultValueHandling = DefaultValueHandling.Ignore,
DateFormatHandling = DateFormatHandling.IsoDateFormat,
;
serializer.Converters.Add(new StringEnumConverter CamelCaseText = true);
return serializer;
我希望这不是要询问的大量信息。
HelpScoutNet：https://github.com/Selz/HelpScoutNet
相关HelpScout API：http://developer.helpscout.net/help-desk-api/reports/user/user/
编辑：让追踪器工作，得到这个结果。这完全令人困惑，它无法找到这些属性，但它适用于据我所知构建相同的其他类：
2015-08-18T00:59:30.188 Info Started deserializing HelpScoutNet.SingleItem`1[Hel
pScoutNet.Model.Report.User.UserReports.UserReport]. Path 'filterTags', line 1,
position 14.
2015-08-18T00:59:30.189 Verbose Could not find member 'filterTags' on HelpScoutN
et.SingleItem`1[HelpScoutNet.Model.Report.User.UserReports.UserReport]. Path 'fi
lterTags', line 1, position 14.
2015-08-18T00:59:30.194 Verbose Could not find member 'user' on HelpScoutNet.Sin
gleItem`1[HelpScoutNet.Model.Report.User.UserReports.UserReport]. Path 'user', l
ine 1, position 276.
2015-08-18T00:59:30.198 Verbose Could not find member 'current' on HelpScoutNet.
SingleItem`1[HelpScoutNet.Model.Report.User.UserReports.UserReport]. Path 'curre
nt', line 1, position 470.
2015-08-18T00:59:30.200 Info Finished deserializing HelpScoutNet.SingleItem`1[He
lpScoutNet.Model.Report.User.UserReports.UserReport]. Path '', line 1, position
896.
【问题讨论】：
您问题中的 JSON 对应于UserReport 而不是 SingleItem<UserReport> - 没有外部 "item": ... 容器对象。您如何尝试反序列化它？
哇哦。我一定是完全失明了，才错过了这一点。请将此作为答案发布，我很乐意将其标记为正确，这就是问题所在。在这个上完全靠我的裤子座位飞行。
【参考方案1】：
您问题中的 JSON 对应于您的 UserReport 类，而不是 SingleItem<UserReport> - 没有外部 "item": ... 容器对象。所以你需要像这样反序列化它。
【讨论】：
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