Having trouble updating JSON File in C#

April 19, 2022

I have a JSON File below content.

{
  "properties": {
    "workspaceId": "xxxx",
    "logs": [
      {
        "categoryGroup": "allLogs",
        "enabled": false,
        "retentionPolicy": {
          "enabled": false,
          "days": 0
        }
      }
    ],
    "logAnalyticsDestinationType": ""
  }
}

I am trying to change the value of the object workspaceId from "xxxx" to actual value from a string LAWorkspaceID. I am using below code but getting error

System.Private.CoreLib: Exception while executing function:
RAMP-VinnyLearn. Newtonsoft.Json: Accessed JObject values with invalid key value: 0. Object property name expected.

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string LAWorkSpaceID = "NewValueForMyLAWorkspaceID";
string json = File.ReadAllText("DisableRequestBody.json");
dynamic jsonObj = Newtonsoft.Json.JsonConvert.DeserializeObject(json);
jsonObj["properties"][0]["workspaceId"] = LAWorkSpaceID;
string output = Newtonsoft.Json.JsonConvert.SerializeObject(jsonObj, Newtonsoft.Json.Formatting.Indented);
File.WriteAllText("DisableRequestBody.json", output);

>Solution :

"properties" is an object and not array.

try to replace

jsonObj["properties"][0]["workspaceId"]

with

jsonObj["properties"]["workspaceId"]

and the output is

{
  "properties": {
    "workspaceId": "NewValueForMyLAWorkspaceID",
    "logs": [
      {
        "categoryGroup": "allLogs",
        "enabled": false,
        "retentionPolicy": {
          "enabled": false,
          "days": 0
        }
      }
    ],
    "logAnalyticsDestinationType": ""
  }
}