访问深度Json对象中的元素，其中键在C#中是动态的

string jsonString = "{\"name\": \"John\", \"age\": 30, \"address\": {\"city\": \"New York\", \"country\": \"USA\"}}";
dynamic jsonObject = JsonConvert.DeserializeObject(jsonString);

string name = jsonObject.name;
int age = jsonObject.age;
string city = jsonObject.address.city;
string country = jsonObject.address.country;

string jsonString = "{\"name\": \"John\", \"age\": 30, \"address\": {\"city\": \"New York\", \"country\": \"USA\"}}";
dynamic jsonObject = JsonConvert.DeserializeObject<ExpandoObject>(jsonString, new ExpandoObjectConverter());

IDictionary<string, object> jsonDict = jsonObject;
string name = jsonDict.ContainsKey("name") ? jsonDict["name"].ToString() : null;
int age = jsonDict.ContainsKey("age") ? Convert.ToInt32(jsonDict["age"]) : 0;

if (jsonDict.ContainsKey("address"))
{
    IDictionary<string, object> addressDict = jsonDict["address"] as IDictionary<string, object>;
    string city = addressDict.ContainsKey("city") ? addressDict["city"].ToString() : null;
    string country = addressDict.ContainsKey("country") ? addressDict["country"].ToString() : null;
}