C#动态创建对象和其属性

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dynamic contact = new ExpandoObject();     contact.Name = "Patrick Hines";     contact.Phone = "206-555-0144";     contact.Address = new ExpandoObject();     contact.Address.Street = "123 Main St";     contact.Address.City = "Mercer Island";     contact.Address.State = "WA";     contact.Address.Postal = "68402";     string res = JsonConvert.SerializeObject(contact);