如何动态设置JsonProperty值

using Newtonsoft.Json;
using System;
using System.Reflection;

public class MyClass
{
    [JsonProperty(PropertyName = "defaultName")]
    public string MyProperty { get; set; }
}

public class Program
{
    public static void Main(string[] args)
    {
        MyClass obj = new MyClass();
        PropertyInfo propertyInfo = typeof(MyClass).GetProperty("MyProperty");
        JsonPropertyAttribute attribute = propertyInfo.GetCustomAttribute<JsonPropertyAttribute>();

        if (attribute != null)
        {
            attribute.PropertyName = "dynamicName";
        }

        Console.WriteLine(JsonConvert.SerializeObject(obj));
    }
}