HTTP请求 - C#

前情提要

　使用过的一些HTTP请求代码，做个笔记

HttpHelper

public class HttpHelper
{

    private static readonly HttpClient _httpClient;

    static HttpHelper()
    {
        _httpClient = new HttpClient
        {
            Timeout = TimeSpan.FromSeconds(30) // 默认超时时间
        };
    }

    /// <summary>
    /// 设置请求头
    /// </summary>
    /// <param name="headers">请求头键值对</param>
    public static void SetHeaders(Dictionary<string, string> headers)
    {
        _httpClient.DefaultRequestHeaders.Clear();
        if (headers != null)
        {
            foreach (var header in headers)
            {
                _httpClient.DefaultRequestHeaders.Add(header.Key, header.Value);
            }
        }
    }

    /// <summary>
    /// 发送 GET 请求（异步）
    /// </summary>
    /// <param name="url">请求 URL</param>
    /// <returns>响应字符串</returns>
    public static async Task<string> GetAsync(string url)
    {
            try
            {
                HttpResponseMessage response = await _httpClient.GetAsync(url);
                response.EnsureSuccessStatusCode();
                return await response.Content.ReadAsStringAsync();
            }
            catch (Exception ex)
            {
                throw new Exception($"GET 请求失败: {ex.Message}");
            }
        }

    /// <summary>
    /// 发送 GET 请求（同步）
    /// </summary>
    /// <param name="url">请求 URL</param>
    /// <returns>响应字符串</returns>
    public static string Get(string url)
    {
      try
        {
            HttpResponseMessage response = _httpClient.GetAsync(url).Result;
            response.EnsureSuccessStatusCode();
            return response.Content.ReadAsStringAsync().Result;
        }
        catch (Exception ex)
        {
            throw new Exception($"GET 请求失败: {ex.Message}");
        }
    }


    /// <summary>
    /// 发送 POST 请求（异步）
    /// </summary>
    /// <param name="url">请求 URL</param>
    /// <param name="data">请求数据，json字符串</param>
    /// <param name="contentType">内容类型，默认 application/json</param>
    /// <returns>响应字符串</returns>
    public static async Task<string> PostAsync(string url, string data, string contentType = "application/json")
    {
        try
        {
            var content = new StringContent(data, Encoding.UTF8, contentType);
            HttpResponseMessage response = await _httpClient.PostAsync(url, content);
            response.EnsureSuccessStatusCode();
            return await response.Content.ReadAsStringAsync();
        }
        catch (Exception ex)
        {
            throw new Exception($"POST 请求失败: {ex.Message}");
        }
    }


    /// <summary>
    /// 发送 POST 请求（同步）
    /// </summary>
    /// <param name="url">请求 URL</param>
    /// <param name="data">请求数据，json字符串</param>
    /// <param name="contentType">内容类型，默认 application/json</param>
    /// <returns>响应字符串</returns>
    public static string Post(string url, string data, string contentType = "application/json")
    {
        try
        {
            var content = new StringContent(data, Encoding.UTF8, contentType);
            HttpResponseMessage response = _httpClient.PostAsync(url, content).Result;
            response.EnsureSuccessStatusCode();
            return response.Content.ReadAsStringAsync().Result;
        }
        catch (Exception ex)
        {
          throw new Exception($"POST 请求失败: {ex.Message}");
        }
    }

}

调用示例

class Program
{
    static async Task Main(string[] args)
    {
        // 设置请求头
        HttpHelper.SetHeaders(new Dictionary<string, string>
        {
            { "Authorization", "Bearer your_token_here" }
        });

        // GET 请求
        string getUrl = "https://api.example.com/data";
        string getResponse = await HttpHelper.GetAsync(getUrl);
        Console.WriteLine($"GET 响应: {getResponse}");

        // POST 请求
        string postUrl = "https://api.example.com/update";
        string postData = "{ \"name\": \"test\", \"value\": 123 }";
        string postResponse = await HttpHelper.PostAsync(postUrl, postData);
        Console.WriteLine($"POST 响应: {postResponse}");
    }
}