C#将JSON数据发布到REST API

using System;
using System.Net.Http;
using System.Text;
using Newtonsoft.Json;

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

class Program
{
    static async System.Threading.Tasks.Task Main(string[] args)
    {
        var user = new User { Name = "John Doe", Age = 30 };
        var json = JsonConvert.SerializeObject(user);

        using (var httpClient = new HttpClient())
        {
            var content = new StringContent(json, Encoding.UTF8, "application/json");
            var response = await httpClient.PostAsync("https://api.example.com/users", content);

            if (response.IsSuccessStatusCode)
            {
                Console.WriteLine("User created successfully.");
            }
            else
            {
                Console.WriteLine($"Error: {response.StatusCode}");
            }
        }
    }
}