Json with C # with numbered node

I would advise creating two classes

public class Items: Dictionary<string, Item>
{

}

public class Item
{
    [Newtonsoft.Json.JsonProperty("id")]
    public int Id{ get; set; }
    [Newtonsoft.Json.JsonProperty("nome")]
    public string  Nome { get; set; }
    [Newtonsoft.Json.JsonProperty("Apelido")]
    public string Apelido { get; set; }    
    [Newtonsoft.Json.JsonProperty("Fotos")]        
    public Dictionary<string, string> Fotos { get; set; }
}

and with a simple command using the Json.NET library, do the following:

string json = System.IO.File.ReadAllText("./base.json");

Items objectJson = Newtonsoft.Json.JsonConvert.DeserializeObject<Items>(json);

This variable objectJson is now a type of class Items it's just to access the keys and value easily to search the information contained in the json file.

Actually in json is always the combination chave:valor

Note that the node you say is numbered is a string: "1":{

The form of access is the default:

string id = Convert.ToString(jsonObj["1"]["id"]);
string nome = Convert.ToString(jsonObj["1"]["nome"]);