How to update the element value inside serialized dynamic JSON

Question

I have a requirement in .net(C#) where I need to send the dynamic type of object inside the JSON and need to update it another API and send it again to another API for processing. I am having difficulty de-serializing it to dynamic type to update the one of the property.

I am able to get the values with "RootElement.GetProperty()" but could not fins anything for setting the values inside the JSON.

Appreciate the help.

Example of JSON structure which is getting passed to .net core api:

 {
  "TaskId": "24332",
  "Code": "Sample_code",
      "Type": 1,
      "Name": "New Product",
      "Params": {
        "Year": "2020",
    "Filter": "LTH"
    }
}

Any example of json would be easy to help you out. – Sreenath Sep 16 '20 at 15:42 — Sreenath, Sep 16 '20 at 15:42
@Sreenath: added example in question – Sachin Sep 16 '20 at 15:46 — Sachin, Sep 16 '20 at 15:46
Still not clear what is being asked here. – Sreenath Sep 16 '20 at 15:50 — Sreenath, Sep 16 '20 at 15:50

Athanasios Kataras · Answer 1 · 2020-09-16T16:02:11.117

Using `ExpandoObject`

You can try using the ExpandoObject. This way, you can add/edit properties on the expanding object and then serialize again and have the extended json object.

var obj = JsonConvert.DeserializeObject<ExpandoObject>(jsonText, new ExpandoObjectConverter());

https://learn.microsoft.com/en-us/dotnet/api/system.dynamic.expandoobject?view=netcore-3.1

Represents an object whose members can be dynamically added and removed at run time.

Using `Json.Text`

Guessing that's your approach. Check How to add property in existing json using System.Text.Json library? for solutions.

score 0 · Accepted Answer · answered Sep 16 '20 at 21:16

I would suggest to use Newtonsoft's native objects JObject, JArray or JToken.

For example, in your case, if you want to modify the Params property, you only have to access the object and add/edit the property:

string json = @"{'TaskId':'24332','Code':'Sample_code','Type':1,'Name':'New Product','Params':{'Year':'2020','Filter':'LTH'}}";

JObject jObject = JsonConvert.DeserializeObject<JObject>(json);

if (jObject["Params"] is JObject p) {
    p.Add("ProductType", "Battery");
}

string newJson = JsonConvert.SerializeObject(jObject);

How to update the element value inside serialized dynamic JSON

2 Answers2

Using ExpandoObject

Using Json.Text

Using `ExpandoObject`

Using `Json.Text`