在C#中不使用递归的情况下从嵌套JSON中查找属性值

using System;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;

public class Program
{
    public static void Main()
    {
        string json = @"{
            'name': 'John',
            'age': 30,
            'address': {
                'city': 'New York',
                'country': 'USA'
            }
        }";

        JObject jsonObject = JObject.Parse(json);
        string targetProperty = "city";

        JToken targetValue = FindPropertyValue(jsonObject, targetProperty);
        if (targetValue != null)
        {
            Console.WriteLine($"The value of '{targetProperty}' is '{targetValue}'");
        }
        else
        {
            Console.WriteLine($"The property '{targetProperty}' does not exist");
        }
    }

    public static JToken FindPropertyValue(JObject jsonObject, string propertyName)
    {
        JToken targetValue = null;
        JToken currentToken = jsonObject;

        while (currentToken != null)
        {
            if (currentToken is JObject)
            {
                foreach (JProperty property in ((JObject)currentToken).Properties())
                {
                    if (property.Name == propertyName)
                    {
                        targetValue = property.Value;
                        break;
                    }
                }
            }

            if (targetValue != null)
            {
                break;
            }

            if (currentToken is JArray)
            {
                foreach (JToken childToken in ((JArray)currentToken).Children())
                {
                    if (childToken is JObject)
                    {
                        targetValue = FindPropertyValue((JObject)childToken, propertyName);
                        if (targetValue != null)
                        {
                            break;
                        }
                    }
                }
            }

            currentToken = currentToken.Next;
        }

        return targetValue;
    }
}