C# API代理示例

流程：调用 API → 解析 JSON → 处理错误 → 使用返回代理访问目标站。

using System;
using System.IO;
using System.Net;
using System.Text;
using System.Web.Script.Serialization;

class ApiProxyDemo
{
    static string apiUrl = "http://ip.16yun.cn:817/myip/pl/<ORDER_ID>/?s=<ORDER_SIGN>&u=<USER>&format=json";

    static string HttpGet(string url)
    {
        var req = (HttpWebRequest)WebRequest.Create(url);
        req.Method = "GET";
        using (var resp = (HttpWebResponse)req.GetResponse())
        using (var sr = new StreamReader(resp.GetResponseStream(), Encoding.UTF8))
        {
            if (resp.StatusCode != HttpStatusCode.OK)
                throw new Exception($"API错误: {(int)resp.StatusCode}");
            return sr.ReadToEnd();
        }
    }

    static void VisitWithProxy(string ip, int port)
    {
        var proxy = new WebProxy($"http://{ip}:{port}");
        var req = (HttpWebRequest)WebRequest.Create("https://httpbin.org/ip");
        req.Proxy = proxy;
        using (var resp = (HttpWebResponse)req.GetResponse())
        using (var sr = new StreamReader(resp.GetResponseStream(), Encoding.UTF8))
        {
            Console.WriteLine(sr.ReadToEnd());
        }
    }

    static void Main()
    {
        var body = HttpGet(apiUrl);
        var js = new JavaScriptSerializer();
        dynamic arr = js.Deserialize<object>(body);
        if (((object[])arr).Length == 0) throw new Exception("API 返回为空");
        var first = (System.Collections.Generic.Dictionary<string, object>)((object[])arr)[0];
        string ip = (string)first["ip"];
        int port = Convert.ToInt32(first["port"]);
        VisitWithProxy(ip, port);
    }
}