Iterating through a nested JSON Array in C# with Newtonsoft

Question

I have a block of JSON as follows:

[
  {
    \"id\": 1,
    \"name\": \"Section1\",
    \"project_id\": 100,
    \"configs\": [
      {
        \"id\": 1000,
          


        

Answer 1

A JObject is an object (analogous to a class):

{
    "a": 1,
    "b": true
}

A JArray is a JSON array, and contains multiple JObject entities:

[
    {
        "a": 1,
        "b": true
    },
    {
        "a": 2,
        "b": true
    }
]

The root of a JSON document can be an object, or an array. In your case, it's an array.

The following code and fiddle reveals that your code is fine, provided that you deserialize the document as what it is - an array.

string json = "[{\"id\":1,\"name\":\"Section1\",\"project_id\":100,\"configs\":[{\"id\":1000,\"name\":\"myItem1\",\"group_id\":1}]},{\"id\":2,\"name\":\"Section2\",\"project_id\":100,\"configs\":[{\"id\":1001,\"name\":\"myItem2\",\"group_id\":2},{\"id\":1002,\"name\":\"myItem3\",\"group_id\":2},{\"id\":1003,\"name\":\"myItem4\",\"group_id\":2}]},{\"id\":3,\"name\":\"Section3\",\"project_id\":100,\"configs\":[{\"id\":1004,\"name\":\"myItem5\",\"group_id\":5},]}]";
JArray obj = Newtonsoft.Json.JsonConvert.DeserializeObject(json);
foreach (var result in obj)
{
    foreach (JObject config in result["configs"])
    {
        string id = (string)config["id"];
        string name = (string)config["name"];
        string gid = (string)config["group_id"];

        Console.WriteLine(name + " - " + id + " - " + gid);
    }
}