反序列化 JSON object 的值是 NULL
[英]Value from deserialized JSON object is NULL
问题描述
我在从反序列化的 JSON 字符串中获取值时遇到了一些麻烦。
这是我的 JSON 字符串：
{
"expand": "names,schema",
"startAt": 0,
"maxResults": 1,
"total": 151,
"issues": [
{
"expand": "operations,versionedRepresentations,editmeta,changelog,renderedFields",
"id": "10210",
"self": "https://xxxxxxxxxx.atlassian.net/rest/api/3/issue/10210",
"key": "ITSD-202",
"fields": {
"statuscategorychangedate": "2021-01-25T20:12:11.922+0000",
"issuetype": {
"self": "https://xxxxxxxxxx.atlassian.net/rest/api/3/issuetype/10003",
"id": "10003",
"description": "For customer support issues. Created by Jira Service Desk.",
"iconUrl": "https://xxxxxxxxxx.atlassian.net/secure/viewavatar?size=medium&avatarId=10308&avatarType=issuetype",
"name": "Support",
"subtask": false,
"avatarId": 10308
},
"timespent": null,
"customfield_10030": null,
"customfield_10031": {
"id": "1",
"name": "Time to resolution",
"_links": {
"self": "https://xxxxxxxxxx.atlassian.net/rest/servicedeskapi/request/10210/sla/1"
},
"completedCycles": [],
"ongoingCycle": {
"startTime": {
"iso8601": "2021-01-25T20:12:11+0000",
"jira": "2021-01-25T20:12:11.592+0000",
"friendly": "Yesterday 08:12",
"epochMillis": 1611605531592
},
"breachTime": {
"iso8601": "2021-02-11T14:30:00+0000",
"jira": "2021-02-11T14:30:00.000+0000",
"friendly": "11/Feb/21 02:30",
"epochMillis": 1613053800000
},
"breached": false,
"paused": false,
"withinCalendarHours": false,
"goalDuration": {
"millis": 432000000,
"friendly": "120h"
},
"elapsedTime": {
"millis": 0,
"friendly": "0m"
},
"remainingTime": {
"millis": 432000000,
"friendly": "120h"
}
}
},
"project": {
"self": "https://xxxxxxxxxx.atlassian.net/rest/api/3/project/10000",
"id": "10000",
"key": "ITSD",
"name": "Customer Service Desk",
"projectTypeKey": "service_desk",
"simplified": false,
"avatarUrls": {
"48x48": "https://xxxxxxxxxx.atlassian.net/secure/projectavatar?pid=10000&avatarId=10412",
"24x24": "https://xxxxxxxxxx.atlassian.net/secure/projectavatar?size=small&s=small&pid=10000&avatarId=10412",
"16x16": "https://xxxxxxxxxx.atlassian.net/secure/projectavatar?size=xsmall&s=xsmall&pid=10000&avatarId=10412",
"32x32": "https://xxxxxxxxxx.atlassian.net/secure/projectavatar?size=medium&s=medium&pid=10000&avatarId=10412"
}
},
"customfield_10032": {
"id": "2",
"name": "Time to first response",
"_links": {
"self": "https://xxxxxxxxxx.atlassian.net/rest/servicedeskapi/request/10210/sla/2"
},
"completedCycles": [],
"ongoingCycle": {
"startTime": {
"iso8601": "2021-01-25T20:12:11+0000",
"jira": "2021-01-25T20:12:11.592+0000",
"friendly": "Yesterday 08:12",
"epochMillis": 1611605531592
},
"breachTime": {
"iso8601": "2021-01-26T12:30:00+0000",
"jira": "2021-01-26T12:30:00.000+0000",
"friendly": "Today 12:30",
"epochMillis": 1611664200000
},
"breached": false,
"paused": false,
"withinCalendarHours": false,
"goalDuration": {
"millis": 14400000,
"friendly": "4h"
},
"elapsedTime": {
"millis": 0,
"friendly": "0m"
},
"remainingTime": {
"millis": 14400000,
"friendly": "4h"
}
}
},
"fixVersions": [],
"customfield_10034": {
"languageCode": "en",
"displayName": "English"
},
"resolution": null,
"customfield_10037": null,
"customfield_10027": null,
"customfield_10028": null,
"customfield_10029": null,
"resolutiondate": null,
"workratio": -1,
"lastViewed": "2021-01-25T20:12:11.936+0000",
"watches": {
"self": "https://xxxxxxxxxx.atlassian.net/rest/api/3/issue/ITSD-202/watchers",
"watchCount": 1,
"isWatching": true
},
"created": "2021-01-25T20:12:11.592+0000",
"customfield_10020": null,
"customfield_10021": null,
"customfield_10022": null,
"customfield_10023": null,
"priority": {
"self": "https://xxxxxxxxxx.atlassian.net/rest/api/3/priority/3",
"iconUrl": "https://xxxxxxxxxx.atlassian.net/images/icons/priorities/medium.svg",
"name": "Medium",
"id": "3"
},
"customfield_10024": null,
"customfield_10025": null,
"labels": [],
"customfield_10026": [],
"customfield_10016": null,
"customfield_10017": null,
"customfield_10018": {
"hasEpicLinkFieldDependency": false,
"showField": false,
"nonEditableReason": {
"reason": "PLUGIN_LICENSE_ERROR",
"message": "The Parent Link is only available to Jira Premium users."
}
},
"customfield_10019": "0|i0013b:",
"timeestimate": null,
"versions": [],
"assignee": {
"self": "https://xxxxxxxxxx.atlassian.net/rest/api/3/user?accountId=12345678912345678912345",
"accountId": "12345678912345678912345",
"emailAddress": "first.last@xxxxxxxxxx.co.uk",
"avatarUrls": {
"48x48": "https://secure.gravatar.com/avatar/2758e009bbe7f2348bfdf52d653b6a2b?d=https%3A%2F%2Favatar-management--avatars.us-west-2.prod.public.atl-paas.net%2Finitials%2FBE-1.png",
"24x24": "https://secure.gravatar.com/avatar/2758e009bbe7f2348bfdf52d653b6a2b?d=https%3A%2F%2Favatar-management--avatars.us-west-2.prod.public.atl-paas.net%2Finitials%2FBE-1.png",
"16x16": "https://secure.gravatar.com/avatar/2758e009bbe7f2348bfdf52d653b6a2b?d=https%3A%2F%2Favatar-management--avatars.us-west-2.prod.public.atl-paas.net%2Finitials%2FBE-1.png",
"32x32": "https://secure.gravatar.com/avatar/2758e009bbe7f2348bfdf52d653b6a2b?d=https%3A%2F%2Favatar-management--avatars.us-west-2.prod.public.atl-paas.net%2Finitials%2FBE-1.png"
},
"displayName": "First Last",
"active": true,
"timeZone": "Europe/London",
"accountType": "atlassian"
},
"updated": "2021-01-25T20:12:14.321+0000",
"status": {
"self": "https://xxxxxxxxxx.atlassian.net/rest/api/3/status/10001",
"description": "This was auto-generated by Jira Service Desk during workflow import",
"iconUrl": "https://xxxxxxxxxx.atlassian.net/images/icons/status_generic.gif",
"name": "Waiting for support",
"id": "10001",
"statusCategory": {
"self": "https://xxxxxxxxxx.atlassian.net/rest/api/3/statuscategory/4",
"id": 4,
"key": "indeterminate",
"colorName": "yellow",
"name": "In Progress"
}
},
"components": [],
"customfield_10050": null,
"customfield_10051": null,
"timeoriginalestimate": null,
"customfield_10052": null,
"customfield_10053": null,
"description": null,
"customfield_10010": null,
"customfield_10014": null,
"customfield_10015": null,
"customfield_10005": null,
"customfield_10049": null,
"customfield_10006": null,
"customfield_10007": null,
"security": null,
"customfield_10008": null,
"customfield_10009": null,
"summary": "Barry Test",
"creator": {
"self": "https://xxxxxxxxxx.atlassian.net/rest/api/3/user?accountId=12345678912345678912345",
"accountId": "12345678912345678912345",
"emailAddress": "first.last@xxxxxxxxxx.co.uk",
"avatarUrls": {
"48x48": "https://secure.gravatar.com/avatar/2758e009bbe7f2348bfdf52d653b6a2b?d=https%3A%2F%2Favatar-management--avatars.us-west-2.prod.public.atl-paas.net%2Finitials%2FBE-1.png",
"24x24": "https://secure.gravatar.com/avatar/2758e009bbe7f2348bfdf52d653b6a2b?d=https%3A%2F%2Favatar-management--avatars.us-west-2.prod.public.atl-paas.net%2Finitials%2FBE-1.png",
"16x16": "https://secure.gravatar.com/avatar/2758e009bbe7f2348bfdf52d653b6a2b?d=https%3A%2F%2Favatar-management--avatars.us-west-2.prod.public.atl-paas.net%2Finitials%2FBE-1.png",
"32x32": "https://secure.gravatar.com/avatar/2758e009bbe7f2348bfdf52d653b6a2b?d=https%3A%2F%2Favatar-management--avatars.us-west-2.prod.public.atl-paas.net%2Finitials%2FBE-1.png"
},
"displayName": "First Last",
"active": true,
"timeZone": "Europe/London",
"accountType": "atlassian"
},
"customfield_10040": null,
"customfield_10041": null,
"customfield_10042": null,
"customfield_10043": null,
"reporter": {
"self": "https://xxxxxxxxxx.atlassian.net/rest/api/3/user?accountId=12345678912345678912345",
"accountId": "12345678912345678912345",
"emailAddress": "first.last@xxxxxxxxxx.co.uk",
"avatarUrls": {
"48x48": "https://secure.gravatar.com/avatar/2758e009bbe7f2348bfdf52d653b6a2b?d=https%3A%2F%2Favatar-management--avatars.us-west-2.prod.public.atl-paas.net%2Finitials%2FBE-1.png",
"24x24": "https://secure.gravatar.com/avatar/2758e009bbe7f2348bfdf52d653b6a2b?d=https%3A%2F%2Favatar-management--avatars.us-west-2.prod.public.atl-paas.net%2Finitials%2FBE-1.png",
"16x16": "https://secure.gravatar.com/avatar/2758e009bbe7f2348bfdf52d653b6a2b?d=https%3A%2F%2Favatar-management--avatars.us-west-2.prod.public.atl-paas.net%2Finitials%2FBE-1.png",
"32x32": "https://secure.gravatar.com/avatar/2758e009bbe7f2348bfdf52d653b6a2b?d=https%3A%2F%2Favatar-management--avatars.us-west-2.prod.public.atl-paas.net%2Finitials%2FBE-1.png"
},
"displayName": "First Last",
"active": true,
"timeZone": "Europe/London",
"accountType": "atlassian"
},
"customfield_10044": null,
"customfield_10000": "{}",
"customfield_10001": null,
"customfield_10045": null,
"customfield_10046": null,
"customfield_10002": [
{
"id": "4",
"name": "xxxxxxxxxx.co.uk",
"_links": {
"self": "https://xxxxxxxxxx.atlassian.net/rest/servicedeskapi/organization/4"
}
}
],
"customfield_10003": null,
"customfield_10047": null,
"customfield_10048": null,
"customfield_10004": null,
"customfield_10038": null,
"customfield_10039": null,
"environment": null,
"duedate": null,
"progress": {
"progress": 0,
"total": 0
}
}
}
]
}
这就是我对它进行反序列化并尝试返回值的方式。
var root = JsonConvert.DeserializeObject<Rootobject2>(response.Content);
foreach (var issue in root.issues)
{
string id = issue.id.ToString();
string key = issue.key.ToString();
string summary = issue.fields.summary.ToString();
string creatoremail = issue.fields.creator.emailAddress.ToString();
public class Rootobject2
{
public string expand { get; set; }
public int startAt { get; set; }
public int maxResults { get; set; }
public int total { get; set; }
public Issue[] issues { get; set; }
}
public class Issue
{
public string expand { get; set; }
public string id { get; set; }
public string self { get; set; }
public string key { get; set; }
public Fields fields { get; set; }
}
public class Fields
{
public DateTime statuscategorychangedate { get; set; }
public Issuetype issuetype { get; set; }
public int? timespent { get; set; }
public object customfield_10030 { get; set; }
public Customfield_10031 customfield_10031 { get; set; }
public Project project { get; set; }
public Customfield_10032 customfield_10032 { get; set; }
public object[] fixVersions { get; set; }
public Customfield_10034 customfield_10034 { get; set; }
public Resolution resolution { get; set; }
public object customfield_10037 { get; set; }
public object customfield_10027 { get; set; }
public object customfield_10028 { get; set; }
public object customfield_10029 { get; set; }
public DateTime? resolutiondate { get; set; }
public int workratio { get; set; }
public DateTime? lastViewed { get; set; }
public Watches watches { get; set; }
public DateTime created { get; set; }
public object customfield_10020 { get; set; }
public object customfield_10021 { get; set; }
public object customfield_10022 { get; set; }
public Priority priority { get; set; }
public object customfield_10023 { get; set; }
public DateTime? customfield_10024 { get; set; }
public string customfield_10025 { get; set; }
public object[] customfield_10026 { get; set; }
public object[] labels { get; set; }
public object customfield_10016 { get; set; }
public object customfield_10017 { get; set; }
public Customfield_10018 customfield_10018 { get; set; }
public string customfield_10019 { get; set; }
public int? timeestimate { get; set; }
public object[] versions { get; set; }
public Assignee assignee { get; set; }
public DateTime updated { get; set; }
public Status status { get; set; }
public Component[] components { get; set; }
public object customfield_10050 { get; set; }
public object customfield_10051 { get; set; }
public object timeoriginalestimate { get; set; }
public object customfield_10052 { get; set; }
public object customfield_10053 { get; set; }
public Description description { get; set; }
public Customfield_10010 customfield_10010 { get; set; }
public object customfield_10014 { get; set; }
public object customfield_10015 { get; set; }
public object customfield_10005 { get; set; }
public object customfield_10049 { get; set; }
public object customfield_10006 { get; set; }
public object customfield_10007 { get; set; }
public object security { get; set; }
public object customfield_10008 { get; set; }
public object customfield_10009 { get; set; }
public string summary { get; set; }
public Creator creator { get; set; }
public object customfield_10040 { get; set; }
public object customfield_10041 { get; set; }
public object customfield_10042 { get; set; }
public object customfield_10043 { get; set; }
public Reporter reporter { get; set; }
public string customfield_10000 { get; set; }
public object customfield_10044 { get; set; }
public object customfield_10045 { get; set; }
public object customfield_10001 { get; set; }
public object customfield_10046 { get; set; }
public Customfield_10002[] customfield_10002 { get; set; }
public object customfield_10047 { get; set; }
public object customfield_10003 { get; set; }
public object customfield_10048 { get; set; }
public object customfield_10004 { get; set; }
public object customfield_10038 { get; set; }
public object customfield_10039 { get; set; }
public object environment { get; set; }
public object duedate { get; set; }
public Progress progress { get; set; }
}
（通过在 Visual Studio 中粘贴特殊值创建的字典）
我看到的问题是“对象引用未设置为 object 的实例”。 上
foreach (var issue in root.issues)
非常感谢任何帮助
1 个解决方案
解决方案1
0 已采纳 2021-01-26 07:22:15
您用于反序列化的 class 应如下所示
public class Issuetype {
public string self { get; set; }
public string id { get; set; }
public string description { get; set; }
public string iconUrl { get; set; }
public string name { get; set; }
public bool subtask { get; set; }
public int avatarId { get; set; }
}
public class Links {
public string self { get; set; }
}
public class StartTime {
public DateTime iso8601 { get; set; }
public DateTime jira { get; set; }
public string friendly { get; set; }
public long epochMillis { get; set; }
}
public class BreachTime {
public DateTime iso8601 { get; set; }
public DateTime jira { get; set; }
public string friendly { get; set; }
public long epochMillis { get; set; }
}
public class GoalDuration {
public int millis { get; set; }
public string friendly { get; set; }
}
public class ElapsedTime {
public int millis { get; set; }
public string friendly { get; set; }
}
public class RemainingTime {
public int millis { get; set; }
public string friendly { get; set; }
}
public class OngoingCycle {
public StartTime startTime { get; set; }
public BreachTime breachTime { get; set; }
public bool breached { get; set; }
public bool paused { get; set; }
public bool withinCalendarHours { get; set; }
public GoalDuration goalDuration { get; set; }
public ElapsedTime elapsedTime { get; set; }
public RemainingTime remainingTime { get; set; }
}
public class Customfield10031 {
public string id { get; set; }
public string name { get; set; }
public Links _links { get; set; }
public List<object> completedCycles { get; set; }
public OngoingCycle ongoingCycle { get; set; }
}
public class AvatarUrls {
public string _48x48 { get; set; }
public string _24x24 { get; set; }
public string _16x16 { get; set; }
public string _32x32 { get; set; }
}
public class Project {
public string self { get; set; }
public string id { get; set; }
public string key { get; set; }
public string name { get; set; }
public string projectTypeKey { get; set; }
public bool simplified { get; set; }
public AvatarUrls avatarUrls { get; set; }
}
public class Customfield10032 {
public string id { get; set; }
public string name { get; set; }
public Links _links { get; set; }
public List<object> completedCycles { get; set; }
public OngoingCycle ongoingCycle { get; set; }
}
public class Customfield10034 {
public string languageCode { get; set; }
public string displayName { get; set; }
}
public class Watches {
public string self { get; set; }
public int watchCount { get; set; }
public bool isWatching { get; set; }
}
public class Priority {
public string self { get; set; }
public string iconUrl { get; set; }
public string name { get; set; }
public string id { get; set; }
}
public class NonEditableReason {
public string reason { get; set; }
public string message { get; set; }
}
public class Customfield10018 {
public bool hasEpicLinkFieldDependency { get; set; }
public bool showField { get; set; }
public NonEditableReason nonEditableReason { get; set; }
}
public class Assignee {
public string self { get; set; }
public string accountId { get; set; }
public string emailAddress { get; set; }
public AvatarUrls avatarUrls { get; set; }
public string displayName { get; set; }
public bool active { get; set; }
public string timeZone { get; set; }
public string accountType { get; set; }
}
public class StatusCategory {
public string self { get; set; }
public int id { get; set; }
public string key { get; set; }
public string colorName { get; set; }
public string name { get; set; }
}
public class Status {
public string self { get; set; }
public string description { get; set; }
public string iconUrl { get; set; }
public string name { get; set; }
public string id { get; set; }
public StatusCategory statusCategory { get; set; }
}
public class Creator {
public string self { get; set; }
public string accountId { get; set; }
public string emailAddress { get; set; }
public AvatarUrls avatarUrls { get; set; }
public string displayName { get; set; }
public bool active { get; set; }
public string timeZone { get; set; }
public string accountType { get; set; }
}
public class Reporter {
public string self { get; set; }
public string accountId { get; set; }
public string emailAddress { get; set; }
public AvatarUrls avatarUrls { get; set; }
public string displayName { get; set; }
public bool active { get; set; }
public string timeZone { get; set; }
public string accountType { get; set; }
}
public class Customfield10002 {
public string id { get; set; }
public string name { get; set; }
public Links _links { get; set; }
}
public class Progress {
public int progress { get; set; }
public int total { get; set; }
}
public class Fields {
public DateTime statuscategorychangedate { get; set; }
public Issuetype issuetype { get; set; }
public object timespent { get; set; }
public object customfield_10030 { get; set; }
public Customfield10031 customfield_10031 { get; set; }
public Project project { get; set; }
public Customfield10032 customfield_10032 { get; set; }
public List<object> fixVersions { get; set; }
public Customfield10034 customfield_10034 { get; set; }
public object resolution { get; set; }
public object customfield_10037 { get; set; }
public object customfield_10027 { get; set; }
public object customfield_10028 { get; set; }
public object customfield_10029 { get; set; }
public object resolutiondate { get; set; }
public int workratio { get; set; }
public DateTime lastViewed { get; set; }
public Watches watches { get; set; }
public DateTime created { get; set; }
public object customfield_10020 { get; set; }
public object customfield_10021 { get; set; }
public object customfield_10022 { get; set; }
public object customfield_10023 { get; set; }
public Priority priority { get; set; }
public object customfield_10024 { get; set; }
public object customfield_10025 { get; set; }
public List<object> labels { get; set; }
public List<object> customfield_10026 { get; set; }
public object customfield_10016 { get; set; }
public object customfield_10017 { get; set; }
public Customfield10018 customfield_10018 { get; set; }
public string customfield_10019 { get; set; }
public object timeestimate { get; set; }
public List<object> versions { get; set; }
public Assignee assignee { get; set; }
public DateTime updated { get; set; }
public Status status { get; set; }
public List<object> components { get; set; }
public object customfield_10050 { get; set; }
public object customfield_10051 { get; set; }
public object timeoriginalestimate { get; set; }
public object customfield_10052 { get; set; }
public object customfield_10053 { get; set; }
public object description { get; set; }
public object customfield_10010 { get; set; }
public object customfield_10014 { get; set; }
public object customfield_10015 { get; set; }
public object customfield_10005 { get; set; }
public object customfield_10049 { get; set; }
public object customfield_10006 { get; set; }
public object customfield_10007 { get; set; }
public object security { get; set; }
public object customfield_10008 { get; set; }
public object customfield_10009 { get; set; }
public string summary { get; set; }
public Creator creator { get; set; }
public object customfield_10040 { get; set; }
public object customfield_10041 { get; set; }
public object customfield_10042 { get; set; }
public object customfield_10043 { get; set; }
public Reporter reporter { get; set; }
public object customfield_10044 { get; set; }
public string customfield_10000 { get; set; }
public object customfield_10001 { get; set; }
public object customfield_10045 { get; set; }
public object customfield_10046 { get; set; }
public List<Customfield10002> customfield_10002 { get; set; }
public object customfield_10003 { get; set; }
public object customfield_10047 { get; set; }
public object customfield_10048 { get; set; }
public object customfield_10004 { get; set; }
public object customfield_10038 { get; set; }
public object customfield_10039 { get; set; }
public object environment { get; set; }
public object duedate { get; set; }
public Progress progress { get; set; }
}
public class Issue {
public string expand { get; set; }
public string id { get; set; }
public string self { get; set; }
public string key { get; set; }
public Fields fields { get; set; }
}
public class Root {
public string expand { get; set; }
public int startAt { get; set; }
public int maxResults { get; set; }
public int total { get; set; }
public List<Issue> issues { get; set; }
}
你会像这样反序列化
Root myDeserializedClass = JsonConvert.DeserializeObject<Root>(myJsonResponse);
在创建 json 对象时始终尝试查看引用，我使用此页面
正如下面评论的那样，这将是主要的：
using Newtonsoft.Json;
using System;
using System.IO;
namespace ConsoleApp1
{
class Program
{
static void Main(string[] args)
{
Root myDeserializedClass = JsonConvert.DeserializeObject<Root> (File.ReadAllText(@"response.json"));
foreach (var issue in myDeserializedClass.issues)
{
string id = issue.id.ToString();
string key = issue.key.ToString();
string summary = issue.fields.summary.ToString();
string creatoremail = issue.fields.creator.emailAddress.ToString();
}
}
}
}
我认为您遇到的问题可能是您编写 foreach 的方式？ 我的意思是代码似乎缺少一些东西，但也许你缩短了它。
反序列化 object type get value throw null reference
[英]Deserialized object type get value throw null reference
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