如何使用HttpClient发布一个简单的POCO？

using System;
using System.Net.Http;
using System.Threading.Tasks;
using Newtonsoft.Json;

public class Person
{
    public string Name { get; set; }
    public int Age { get; set; }
}

var httpClient = new HttpClient();
httpClient.BaseAddress = new Uri("https://api.example.com/");
httpClient.DefaultRequestHeaders.Accept.Clear();
httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

var person = new Person
{
    Name = "John Doe",
    Age = 30
};

var json = JsonConvert.SerializeObject(person);

var content = new StringContent(json, Encoding.UTF8, "application/json");

var response = await httpClient.PostAsync("api/person", content);

response.EnsureSuccessStatusCode();
var responseContent = await response.Content.ReadAsStringAsync();