C# WebClient login to accounts.google.com

经过一番折腾之后，看起来WebClient类并不是解决这个特定问题的最佳方法。

为了达到下面的目标，我必须跳一层到WebRequest。

当制作WebRequest (HttpWebRequest)和使用HttpWebResponse时，可以设置CookieContainer

        webRequest_ = (HttpWebRequest)HttpWebRequest.Create(rparams.URL);
        webRequest_.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)";
        CookieContainer cookieJar = new CookieContainer();
        webRequest_.CookieContainer = cookieJar;
        string html = string.Empty;
        try
        {
            using (WebResponse response = webRequest_.GetResponse())
            {
                using (var streamReader = new StreamReader(response.GetResponseStream()))
                {
                    html = streamReader.ReadToEnd();
                    ParseLoginRequest(html, response,cookieJar);
                }
            }
        }
        catch (WebException e)
        {
            using (WebResponse response = e.Response)
            {
                HttpWebResponse httpResponse = (HttpWebResponse)response;
                Console.WriteLine("Error code: {0}", httpResponse.StatusCode);
                using (var streamReader = new StreamReader(response.GetResponseStream()))
                    Console.WriteLine(html = streamReader.ReadToEnd());
            }
        }

，然后在制作post时以以下方式使用相同的Cookie容器

        webRequest_ = (HttpWebRequest)HttpWebRequest.Create(rparams.URL);
        webRequest_.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)";
        webRequest_.Method = "POST";
        webRequest_.ContentType = "application/x-www-form-urlencoded";
        webRequest_.CookieContainer = cookieJar;
        var parameters = new StringBuilder();
        foreach (var key in rparams.Params)
        {
            parameters.AppendFormat("{0}={1}&",HttpUtility.UrlEncode(key.ToString()),
                HttpUtility.UrlEncode(rparams.Params[key.ToString()]));
        }
        parameters.Length -= 1;
        using (var writer = new StreamWriter(webRequest_.GetRequestStream()))
        {
            writer.Write(parameters.ToString());
        }
        string html = string.Empty;
        using (response = webRequest_.GetResponse())
        {
            using (var streamReader = new StreamReader(response.GetResponseStream()))
            {
                html = streamReader.ReadToEnd();
            }
        }

所以这是有效的，这段代码不是用于生产使用，可以/应该进行优化。

这是在答案窗格中编写的一个快速示例，未经过测试。您可能需要从初始请求中解析一些值，以便将一些表单值放入formData。我的很多代码是基于这种类型的过程，除非我们需要刮facebook辐条类型的网站，在这种情况下，ajax使我们使用不同的方法。

using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Linq;
using System.Text;
namespace GMailTest
{
    class Program
    {
        private static NameValueCollection formData = new NameValueCollection();
        private static CookieAwareWebClient webClient = new CookieAwareWebClient();
        static void Main(string[] args)
        {
            formData.Clear();
            formData["service"] = "oz";
            formData["dsh"] = "-8355435623354577691";
            formData["GALX"] = "33xq1Ma_CKI";
            formData["timeStmp"] = "";
            formData["secTok"] = "";
            formData["Email"] = "test@test.xom";
            formData["Passwd"] = "password";
            formData["signIn"] = "Sign in";
            formData["PersistentCookie"] = "yes";
            formData["rmShown"] = "1";
            byte[] responseBytes = webClient.UploadValues("https://accounts.google.com/ServiceLoginAuth?service=oz", "POST", formData);
            string responseHTML = Encoding.UTF8.GetString(responseBytes);
        }
    }
    public class CookieAwareWebClient : WebClient
    {
        public CookieAwareWebClient() : this(new CookieContainer())
        { }
        public CookieAwareWebClient(CookieContainer c)
        {
            this.CookieContainer = c;
            this.Headers.Add("User-Agent: Mozilla/5.0 (Windows NT 6.1) AppleWebKit/536.5 (KHTML, like Gecko) Chrome/19.0.1084.52 Safari/536.5");
        }
        public CookieContainer CookieContainer { get; set; }
        protected override WebRequest GetWebRequest(Uri address)
        {
            WebRequest request = base.GetWebRequest(address);
            if (request is HttpWebRequest)
            {
                (request as HttpWebRequest).CookieContainer = this.CookieContainer;
            }
            return request;
        }
    }
}