因為要做百度網盤的相關操作，，需要登入百度，網上搜了半天都是以前百度沒用RSA加密時候的原始碼，，只能自己動手，說實話挺累的，花了一晚上時間終於可以了！
還有個新浪微博登入的，看了下網上能搜到，就不發了。希望對大家有用！
感謝蘇菲的httphelper類 省了不少時間！

//主要程式碼
 
//獲取token
public bool GetToken()
{
    var url = "https://passport.baidu.com/v2/api/?getapi&";
 
    var nvc = new NameValueCollection
    {
        {"apiver", "v3"},
        {"callback", "customName"},
        {"class", ""},
        {"logintype", "basicLogin"},
        {"tpl", "pp"},
        {"tt", DateTime.Now.Ticks.ToString()},
    };
    var httpResult = new HttpHelper().GetHtml(
        new HttpItem()
        {
            URL = url + HttpHelper.DataToString(nvc),
            Method = "GET",
            CookieContainer = cookies,
            ResultCookieType = ResultCookieType.CookieContainer
        });
    if (httpResult.StatusCode.Equals(HttpStatusCode.OK))
    {
        var mc = new Regex(@"\((?<jsonStr>.*)\)").Match(httpResult.Html.Replace("\n", string.Empty));
        if (mc.Success)
        {
            dynamic obj = JsonConvert.DeserializeObject<JObject>(mc.Groups["jsonStr"].Value);
            var no = obj.errInfo.no.Value;
            if (no.Equals("0"))
            {
                token = obj.data.token.Value;
                return true;
            }
        }
 
    }
    return false;
}
//獲取key
public bool GetPubksyAndRsakey()
{
    var url = "https://passport.baidu.com/v2/getpublickey?";
    var nvc = new NameValueCollection
    {
        {"apiver", "v3"},
        {"callback", "customName"},
        {"token", token},
        {"tpl", "pp"},
        {"tt", DateTime.Now.Ticks.ToString()},
    };
    var httpResult = new HttpHelper().GetHtml(
        new HttpItem()
        {
            URL = url + HttpHelper.DataToString(nvc),
            Method = "GET",
            CookieContainer = cookies,
            ResultCookieType = ResultCookieType.CookieContainer
        });
    if (httpResult.StatusCode.Equals(HttpStatusCode.OK))
    {
        var mc = new Regex(@"\((?<jsonStr>.*)\)").Match(httpResult.Html);
        if (mc.Success)
        {
            dynamic obj = JsonConvert.DeserializeObject<JObject>(mc.Groups["jsonStr"].Value);
            var no = obj.errno.Value;
            if (no.Equals("0"))
            {
                pubksy = obj.pubkey.Value;
                rsakey = obj.key.Value;
                return true;
            }
        }
        return true;
    }
    return false;
}
//獲取驗證碼
public Image GetValCode()
{
    var url = "https://passport.baidu.com/v2/?reggetcodestr&";
    var nvc = new NameValueCollection
    {
        {"apiver", "v3"},
        {"callback", "customName"},
        {"fr", "login"},
        {"token", token},
        {"tpl", "pp"},
        {"tt", DateTime.Now.Ticks.ToString()},
    };
    var httpResult = new HttpHelper().GetHtml(
        new HttpItem()
        {
            URL = url + HttpHelper.DataToString(nvc),
            Method = "GET",
            CookieContainer = cookies,
            ResultCookieType = ResultCookieType.CookieContainer
        });
    if (httpResult.StatusCode.Equals(HttpStatusCode.OK))
    {
        var mc = new Regex(@"\((?<jsonStr>.*)\)").Match(httpResult.Html.Replace("\n", string.Empty));
        if (mc.Success)
        {
            dynamic obj = JsonConvert.DeserializeObject<JObject>(mc.Groups["jsonStr"].Value);
            var no = obj.errInfo.no.Value;
            if (no.Equals("0"))
            {
                verifyStr = obj.data.verifyStr.Value;
                var verifySign = obj.data.verifySign.Value;
                url = "https://passport.baidu.com/cgi-bin/genimage?";
                httpResult = new HttpHelper().GetHtml(
                    new HttpItem()
                    {
                        URL = url + verifyStr,
                        Method = "GET",
                        CookieContainer = cookies,
                        ResultCookieType = ResultCookieType.CookieContainer,
                        ResultType = ResultType.Byte
                    });
                if (httpResult.StatusCode.Equals(HttpStatusCode.OK))
                {
                    return Image.FromStream(new MemoryStream(httpResult.ResultByte));
                }
            }
 
        }
    }
    return null;
}
//檢查兼驗證碼
public bool CheckValCode(string code)
{
    var url = "https://passport.baidu.com/v2/?checkvcode&";
    var nvc = new NameValueCollection
    {
        {"apiver", "v3"},
        {"token", token},
        {"tpl", "pp"},
        {"fr", "login"},
        {"token", token},
        {"tpl", "pp"},
        {"tt", DateTime.Now.Ticks.ToString()},
        {"verifycode", code},
        {"codestring", verifyStr},
        {"callback", "customName"},
    };
    var httpResult = new HttpHelper().GetHtml(
        new HttpItem()
        {
            URL = url + HttpHelper.DataToString(nvc),
            Method = "GET",
            CookieContainer = cookies,
            ResultCookieType = ResultCookieType.CookieContainer
        });
    if (httpResult.StatusCode.Equals(HttpStatusCode.OK))
    {
        var mc = new Regex(@"\((?<jsonStr>.*)\)").Match(httpResult.Html.Replace("\n", string.Empty));
        if (mc.Success)
        {
            dynamic obj = JsonConvert.DeserializeObject<JObject>(mc.Groups["jsonStr"].Value);
            var no = obj.errInfo.no.Value;
            if (no.Equals("0"))
            {
                valcode = code;
                return true;
            }
        }
    }
    return false;
}
//登入
public bool Login(string userName, string pswd)
{
    pswd = GetPswd(pswd, pubksy.Replace("\n", "\\n"));
    var url = "https://passport.baidu.com/v2/api/?login";
    var nvc = new NameValueCollection
    {
        {"apiver", "v3"},
        {"staticpage", "https://passport.baidu.com/static/passpc-account/html/v3Jump.html"},
        {"charset", "UTF-8"},
        {"token", token},
        {"tpl", "pp"},
        {"tt", DateTime.Now.Ticks.ToString()},
        {"codestring", verifyStr},
        {"safeflg", "0"},
        {"u", "https://passport.baidu.com/"},
        {"isPhone", "false"},
        {"detect", "1"},
        {"quick_user", "0"},
        {"logintype", "basicLogin"},
        {"logLoginType", "pc_loginBasic"},
        {"loginmerge", "true"},
        {"username", userName},
        {"password", pswd},
        {"verifycode", valcode},
        {"mem_pass", "on"},
        {"rsakey", rsakey},
        {"crypttype", "12"},
        {"ppui_logintime", "111111"},
        {"callback", "customName"},
    };
    var httpResult = new HttpHelper().GetHtml(
        new HttpItem
        {
            URL = url,
            Method = "POST",
            ContentType = "application/x-www-form-urlencoded",
            Postdata = HttpHelper.DataToString(nvc),
            PostDataType = PostDataType.String,
            CookieContainer = cookies,
            ResultCookieType = ResultCookieType.CookieContainer
        });
    if (httpResult.StatusCode.Equals(HttpStatusCode.OK))
    {
        Debug.WriteLine(httpResult.Html);
        Debug.WriteLine(HttpHelper.GetAllCookiesToString(cookies));
        return HttpHelper.GetAllCookies(cookies).FirstOrDefault(c => c.Name.Equals("STOKEN")) != null;
    }
    return false;
}