How to display JSON data (nested) in C#

Question

I am fetching an API that returns a JSON response like this:

{
"id": 161635,
"rev": 1,
"fields": {
  "System.Url": "http://google.com",
  "System.Type": "Bug",
  "System.State": "New",
  "System.AssignedTo": {
    "displayName": "John Doe"
    }
  }
}

I want to display the id and everything inside fields. This is my model:

public class WorkItemDetail {
  public int id { get; set; }
  public Dictionary<string, object> fields {get;set;}
}

Here is the problem, I can display the id and everything in fields except for some reason, I can't show displayName

Here is what I doing:

@WorkItemDetailResponse.id
@WorkItemDetailResponse.fields["System.WorkItemType"];  
@WorkItemDetailResponse.fields["System.State"]; 
@WorkItemDetailResponse.fields["System.AssignedTo"]; 
@WorkItemDetailResponse.fields["System.AssignedTo"]["displayName"]; <!-- does not work -->


@code{
 WorkItemDetailResponse = JsonConvert.DeserializeObject<WorkItemDetail>(ResponseBody); 
}

I am new to C# so I don't know why this line is not working

@WorkItemDetailResponse.fields["System.AssignedTo"]["displayName"]

You have to create each class for every nested json

gowtham758550
– gowtham758550

2022-06-29 12:19:48 +00:00
Commented Jun 29, 2022 at 12:19 — gowtham758550
– gowtham758550, Commented Jun 29, 2022 at 12:19

Nitin S · Accepted Answer · 2022-06-29 12:30:15Z

4

Create your DTO structure as follows:

public class Fields
{
    [JsonProperty("System.Url")]
    public string SystemUrl { get; set; }

    [JsonProperty("System.Type")]
    public string SystemType { get; set; }

    [JsonProperty("System.State")]
    public string SystemState { get; set; }

    [JsonProperty("System.AssignedTo")]
    public SystemAssignedTo SystemAssignedTo { get; set; }
}

public class WorkItemDetail
{
    public int id { get; set; }
    public int rev { get; set; }
    public Fields fields { get; set; }
}

public class SystemAssignedTo
{
    public string displayName { get; set; }
}

here's fiddle: https://dotnetfiddle.net/F9Wppv

another way - using dynamic variable: https://dotnetfiddle.net/Goh7YY

edited Jun 29, 2022 at 12:30

answered Jun 29, 2022 at 12:20

Nitin S

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2 Comments

elektra Over a year ago

Thanks a lot, it works and I understand how to do it for other fields.

Nitin S Over a year ago

you can auto generate this structure from json: json2csharp.com

Charlieface · Accepted Answer · 2022-06-29 12:32:40Z

2

You need to cast the object value to a JObject

((JObject)JsonConvert.DeserializeObject<WorkItemDetail>(json).fields["System.AssignedTo"])["displayName"]

JSON.Net will create a JObject if the property type is object and the value is a JSON object.

db<>fiddle

answered Jun 29, 2022 at 12:32

Charlieface

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