JSON Serialize array returns NULL in JSON string

Question

I am building a JSON model like this

JObject issue_model = JObject.FromObject(new
{
   labels = new[] { "import", "automation"}
}

below code for serialization

string request_json = JsonConvert.SerializeObject(issue_model,
                  Newtonsoft.Json.Formatting.Indented,
                  new JsonSerializerSettings { NullValueHandling = NullValueHandling.Ignore });

But when i try to build this from a dynamic list of values like

   list<string> lp_list = new list<string>();
   //lp_list contains a list of string values
   string[] lp_labels = lp_list.ToArray();
   JObject issue_model = JObject.FromObject(new
   {
      labels = jira_labels
   }

I got the JSON as

   "labels": [
  [
    null,
    null
  ]
]

But i am expecting this json as

"labels" : { "import", "automation"}

How can i make the array serialization right way

you migth want to first build a model class to represent your json object in c#. This way you can define a property of name labels and save a List<string> or a string[] in there. Have a look at this quicktype example i through together — Amelia B
– Amelia B, Commented May 23, 2018 at 5:29
I have some restrictions of using model class approach . since i have lot of properties and it is varying for each request. So i prefer on the go or t dynamic model creation — Sebastian
– Sebastian, Commented May 23, 2018 at 5:33
Am I guessing right that you want to have lp_list inside the labels property at the end? If yes why are your asigning jira_labels to it? — Amelia B
– Amelia B, Commented May 23, 2018 at 5:42

JonathanDavidArndt · Accepted Answer · 2018-09-12 12:54:58Z

4

I modified your code in a console Application.

List<string> lp_list = new List<string>();
lp_list.Add("import");
lp_list.Add("automation");

//lp_list contains a list of string values
//string[] lp_labels = lp_list.ToArray();
JObject issue_model = JObject.FromObject(new
{
    labels = lp_list
});

Console.WriteLine(issue_model);

The result is as follows:

Hope it answers your question.

edited Sep 12, 2018 at 12:54

JonathanDavidArndt

2,76013 gold badges41 silver badges53 bronze badges

answered May 23, 2018 at 5:44

willzh

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5 Comments

Amelia B Over a year ago

The lp_list.ToArray() isn't necessary in this case.

willzh Over a year ago

Yeah,I modify code like this " labels = lp_list"，it also take effective.

Amelia B Over a year ago

Thanks oh and +1 for finishing basically 2 seconds before me with the answer

willzh Over a year ago

my pleasure :).

Sebastian Over a year ago

This is the code i used and its my mistake of assigning items to list string . Now i figured it out an thanks for the help

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