Jobject using .Add in a nested element

Question

If I had a Json Object:

{ 
"data":{
      "SomeArray":[
         {
            "name":"test1"
         },
         {
            "name":"test2"
         },
         {
            "name":"test3"
         }
      ]
   }
}

And this object is Parsed using Jobject.Parse(jsonString);

How would I add a field under data that holds the count of the items in the array to be forwarded tro another system. The count has already been calculated. I just need to add it in like this:

{ 
"data":{
      "Count" : 3,
      "SomeArray" : [

I have tried

myJObject["data"].Add("Count",count);

But .Add does not work here. The only option I see is AddAfterSelf()

Is there no way to just add a simple key value pair without having to create Jproperty first and add it using AddAfterSelf?

Or is the correct way: x["Data"].AddAfterSelf(new JProperty("Count", count));

Maxian Nicu · Accepted Answer · 2021-11-10 09:58:00Z

1

The problem here is that myJObject["data"] returns an JToken which is base class for JObject.

If you're sure that "data" will be always an object, you can do following

var data = myJObject.GetValue("data") as JObject;
data.Add("Count",120);

answered Nov 10, 2021 at 9:58

Maxian Nicu

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2 Comments

Bike_dotnet Over a year ago

How would I then add the data back into the original JObject, just by doing myJObject["data"] = data; ?

Maxian Nicu Over a year ago

@Bike_dotnet you should not do it. it will be automatically present in myJObject because it is referenced data type.

DavidG · Accepted Answer · 2021-11-10 09:57:12Z

1

You could do this by casting the JToken that you get from myJObject["data"] as a JObject. For example:

var data = (JObject)myJObject["data"];
data.Add("Count", 3);

answered Nov 10, 2021 at 9:57

DavidG

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