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// 一段充滿歷史感的代碼var request = (HttpWebRequest)WebRequest.Create("https://api.example.com/data");request.Method = "GET";
request.BeginGetResponse(asyncResult =>{    try {        var response = (HttpWebResponse)request.EndGetResponse(asyncResult);        using (var reader = new StreamReader(response.GetResponseStream()))        {            string result = reader.ReadToEnd();            Console.WriteLine(result);        }    }    catch (WebException ex) {        // 繁瑣的錯(cuò)誤處理    }}, null);

// 現(xiàn)代優(yōu)雅的寫法using var httpClient = new HttpClient();
try {    HttpResponseMessage response = await httpClient.GetAsync("https://api.example.com/data");    response.EnsureSuccessStatusCode();    string responseBody = await response.Content.ReadAsStringAsync();    Console.WriteLine(responseBody);}catch (HttpRequestException e) {    Console.WriteLine($"請(qǐng)求出錯(cuò): {e.Message}");}

// 流暢API，專為REST而生var options = new RestClientOptions("https://api.example.com");var client = new RestClient(options);
var request = new RestRequest("data")    .AddQueryParameter("page", "1");
var response = await client.GetAsync<MyDataModel>(request);
if (response != null) {    Console.WriteLine($"數(shù)據(jù): {response.SomeProperty}");}

// Program.cs中注冊(cè)builder.Services.AddHttpClient("GitHubClient", client => {    client.BaseAddress = new Uri("https://api.github.com/");    client.DefaultRequestHeaders.Add("Accept", "application/vnd.github.v3+json");    client.DefaultRequestHeaders.Add("User-Agent", "MyApp");});
// 在Controller中使用[ApiController][Route("[controller]")]public class MyController : ControllerBase {    private readonly IHttpClientFactory _clientFactory;
    public MyController(IHttpClientFactory clientFactory) {        _clientFactory = clientFactory;    }
    [HttpGet]    public async Task<IActionResult> Get() {        var client = _clientFactory.CreateClient("GitHubClient");        var response = await client.GetAsync("/users/octocat/repos");        // ...    }}

// 配置認(rèn)證和參數(shù)如此簡(jiǎn)單var client = new RestClient("https://api.example.com");var request = new RestRequest("users/{id}")    .AddUrlSegment("id", 123)    .AddQueryParameter("fields", "name,email")    .AddHeader("Authorization", $"Bearer {token}");
// 自動(dòng)反序列化為強(qiáng)類型對(duì)象var user = await client.GetAsync<UserResponse>(request);
// POST請(qǐng)求同樣簡(jiǎn)潔var createRequest = new RestRequest("users", Method.Post)    .AddJsonBody(new { Name = "John", Email = "john@example.com" });
var createdUser = await client.PostAsync<UserResponse>(createRequest);