如何为匿名类型编写扩展方法？

public static class AnonymousTypeExtensions
{
    public static void PrintProperties(this object obj)
    {
        dynamic dynamicObj = obj;
        var properties = dynamicObj.GetType().GetProperties();
        
        foreach (var property in properties)
        {
            var propertyName = property.Name;
            var propertyValue = property.GetValue(dynamicObj);
            
            Console.WriteLine($"{propertyName}: {propertyValue}");
        }
    }
}

var anonymousObject = new { Name = "John", Age = 30, City = "New York" };
anonymousObject.PrintProperties();

Name: John
Age: 30
City: New York