How To Create a JSON Object within an Existing Object in JSON using JObject

Question

I am trying to edit an existing Json File that contains an object called "forge" ("forge" itself is contained within an object called "profiles"), and within that object, I am trying to add another object called resolution that contains height and width. The native application it belongs to can modify and add this element, but I can only seem to be able to read, and write/create all other objects within the forge object except the resolution object and its children.

But no matter how much I read in newtonsoft documentation, nothing appears to be working. This is what I have written so far. Note that this method is just for overwriting all the contents in the "forge" object, and I tired to add the resolution object, but it fails. Anyone know how to do this? (Connection path is the json file)

I should mention, that if that JArray stuff was not there, then it runs fine and overwrites the forge object correctly. — wildBlue
– wildBlue, Commented Apr 20, 2020 at 22:53
@MickyD Would that be more useful? Many tutorials I've seen and read suggest doing it in this fashion, I'm not in love with this so I could create a class to do it, So you are saying the following: Create an object (class) with everything in it, and then instead jsonObj["profiles"]["forge"] = mycreatedclass; then serialize it? — wildBlue
– wildBlue, Commented Apr 20, 2020 at 23:05
Might you please edit your question to include your code and JSON as text rather than as a screenshot? It's required here not to to use images for textual content, see Discourage screenshots of code and/or errors and Why not upload images of code on SO when asking a question for why. — dbc
– dbc, Commented Apr 20, 2020 at 23:37
To add an arbitrary POCO to a JObject or JArray you need to serialize it with some overload of JToken.FromObject. See Could not determine JSON object type for type “Class” for example. But I agree that using JObject here seems like an antipattern, which not just serialize an anonymous object? — dbc
– dbc, Commented Apr 20, 2020 at 23:39

Damon Abdiel · Accepted Answer · 2020-04-20 23:29:16Z

1

I think the "resolution" is not array, but an object.

Try this

    dynamic forge = new JObject();
    forge.Name = "forge";
    forge.Type = "Brasil";

    dynamic resolutionObj = new JObject();

    resolutionObj.Width = "10";
    resolutionObj.Height = "100"; 

    forge.resolution = resolutionObj;

You will see anything like this:

{
  "Name": "forge",
  "Type": "Brasil",
  "resolution": {
    "Width": "10",
    "Height": "100"
  }
}

answered Apr 20, 2020 at 23:29

Damon Abdiel

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