using System;

using System.Net.Http;

using Newtonsoft.Json;

然后，我们需要编写一个函数来发送HTTP请求，并处理返回的JSON数据。这里以获取Instagram用户信息为例：

public async Task<string> GetInstagramUserInfo(string username, string proxyHost, int proxyPort)

{

    string apiUrl = $"https://www.instagram.com/{username}/?__a=1";

    HttpClient httpClient = new HttpClient();

    httpClient.DefaultRequestHeaders.Add("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.9999.99 Safari/537.36");

    if (!string.IsNullOrEmpty(proxyHost) && proxyPort > 0)

    {

        var proxy = new WebProxy(proxyHost, proxyPort);

        httpClientHandler.Proxy = proxy;

    }

    try

    {

        HttpResponseMessage response = await httpClient.GetAsync(apiUrl);

        response.EnsureSuccessStatusCode();

        string jsonString = await response.Content.ReadAsStringAsync();

        return jsonString;

    }

    catch (HttpRequestException ex)

    {

        Console.WriteLine($"Error: {ex.Message}");

        return null;

    }

    finally

    {

        httpClient.Dispose();

    }

}

在调用此函数时，我们可以传入Instagram用户名、代理IP地址和端口号，以发送HTTP请求并获取用户信息的JSON数据。

最后，我们可以在主程序中调用该函数，并对返回的JSON数据进行解析和处理：

static async Task Main(string[] args)

{

    string username = "example";

    string proxyHost = "www.16yun.cn";

    int proxyPort = 5445;

    string proxyUser = "16QMSOML";

    string proxyPass = "280651";

    string jsonString = await GetInstagramUserInfo(username, proxyHost, proxyPort, proxyUser, proxyPass);

    if (!string.IsNullOrEmpty(jsonString))

    {

        dynamic userData = JsonConvert.DeserializeObject(jsonString);

        Console.WriteLine($"User ID: {userData.graphql.user.id}");

        Console.WriteLine($"Full Name: {userData.graphql.user.full_name}");

        Console.WriteLine($"Biography: {userData.graphql.user.biography}");

        // 其他信息处理...

    }

}

同时，我们需要修改 GetInstagramUserInfo 函数，以便传入代理的用户名和密码，并设置代理的认证信息：

public async Task<string> GetInstagramUserInfo(string username, string proxyHost, int proxyPort, string proxyUser, string proxyPass)

{

    string apiUrl = $"https://www.instagram.com/{username}/?__a=1";

    HttpClient httpClient = new HttpClient();

    httpClient.DefaultRequestHeaders.Add("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.9999.99 Safari/537.36");

    if (!string.IsNullOrEmpty(proxyHost) && proxyPort > 0)

    {

        var proxy = new WebProxy(proxyHost, proxyPort)

        {

            Credentials = new NetworkCredential(proxyUser, proxyPass)

        };

        httpClientHandler.Proxy = proxy;

    }

    try

    {

        HttpResponseMessage response = await httpClient.GetAsync(apiUrl);

        response.EnsureSuccessStatusCode();

        string jsonString = await response.Content.ReadAsStringAsync();

        return jsonString;

    }

    catch (HttpRequestException ex)

    {

        Console.WriteLine($"Error: {ex.Message}");

        return null;

    }

    finally

    {

        httpClient.Dispose();

    }

}