net core HttpClient

序列化和反序列化来自网络的 JSON 有效负载是常见的操作。

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

namespace HttpClientExtensionMethods
{
    public class User
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public string Username { get; set; }
        public string Email { get; set; }
    }

    public class Program
    {
        public static async Task Main()
        {
            using HttpClient client = new()
            {
                BaseAddress = new Uri("https://jsonplaceholder.typicode.com")
            };

            // Get the user information.
            User user = await client.GetFromJsonAsync<User>("users/1");
            Console.WriteLine($"Id: {user.Id}");
            Console.WriteLine($"Name: {user.Name}");
            Console.WriteLine($"Username: {user.Username}");
            Console.WriteLine($"Email: {user.Email}");

            // Post a new user.
            HttpResponseMessage response = await client.PostAsJsonAsync("users", user);
            Console.WriteLine(
                $"{(response.IsSuccessStatusCode ? "Success" : "Error")} - {response.StatusCode}");
        }
    }
}

// Produces output like the following example but with different names:
//
//Id: 1
//Name: Tyler King
//Username: Tyler
//Email: Tyler @contoso.com
//Success - Created