using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            Class1 a = new Class1();
            a.GoogleTranslate("我喜欢", "auto", "en");
        }
    }
}

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using System.Web;

namespace ConsoleApplication1
{
    public class Class1
    {
        public string cok = "_ga=GA1.3.57119681.1530535466; _gid=GA1.3.822279719.1530535466; 1P_JAR=2018-7-2-13; NID=133=flt3w-FDEcjIeJEyNlrSsDT234uDZR5FCndtTvrkwShKHLzaTsk9FFQ0-7C9f_Qg0AgDHlVU-Z7Mz8JucebVhb2eW32XabvEEVoIJhdalWeCnkso8NUQvrBMEPT4eUJS";
        public string rep = "";
        public string usergant = "Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36";

        /// <summary>
        /// 谷歌翻译
        /// </summary>
        /// <param name="text">待翻译文本</param>
        /// <param name="fromLanguage">自动检测：auto</param>
        /// <param name="toLanguage">中文：zh-CN，英文：en</param>
        /// <returns>翻译后文本</returns>
        public string GoogleTranslate(string text, string fromLanguage, string toLanguage)
        {
            CookieContainer cc = new CookieContainer();

            string GoogleTransBaseUrl = "https://translate.google.com/";

            var BaseResultHtml = GetResultHtml(GoogleTransBaseUrl, cc, "");

            Regex re = new Regex(@"(?<=TKK=)(.*?)(?=\);)");

            var TKKStr = re.Match(BaseResultHtml).ToString() + ")";//在返回的HTML中正则匹配TKK的JS代码

            var TKK = ExecuteScript(TKKStr, TKKStr);//执行TKK代码，得到TKK值

            var GetTkkJS = File.ReadAllText("./gettk.js");

            var tk = ExecuteScript("tk(\"" + text + "\",\"" + TKK + "\")", GetTkkJS);

            string googleTransUrl = "https://translate.google.com/translate_a/single?client=t&sl=" + fromLanguage + "&tl=" + toLanguage + "&hl=en&dt=at&dt=bd&dt=ex&dt=ld&dt=md&dt=qca&dt=rw&dt=rm&dt=ss&dt=t&ie=UTF-8&oe=UTF-8&otf=1&ssel=0&tsel=0&kc=1&tk=" + tk + "&q=" + HttpUtility.UrlEncode(text);

            var ResultHtml = GetResultHtml(googleTransUrl, cc, "https://translate.google.com/");

            // dynamic TempResult = Newtonsoft.Json.JsonConvert.DeserializeObject(ResultHtml);

            //string ResultText = Convert.ToString(TempResult[0][0][0]);

            //return ResultText;
            return "";
        }

        public string GetResultHtml(string url, CookieContainer cc, string refer)
        {
            var html = "";

            var webRequest = WebRequest.Create(url) as HttpWebRequest;
            webRequest.CookieContainer = new CookieContainer();

            //加cookie
            CookieContainer cook = new CookieContainer();
          //  string[] cookstr = cok.Split(';');
          //  foreach (var item in cookstr)
          //{
          //string[] cookieNameValue = item.Split('=');
          // Cookie ck = new Cookie(cookieNameValue[0].Trim().ToString(), cookieNameValue[1].Trim().ToString());
          // ck.Domain = "https://translate.google.cn/";
          // cook.Add(ck);
          //}

            webRequest.Method = "GET";

            webRequest.CookieContainer = cc;

            webRequest.Referer = "https://translate.google.cn/";

            webRequest.UserAgent = usergant;

            webRequest.Timeout = ;

            webRequest.Headers.Add("X-Requested-With:XMLHttpRequest");

            webRequest.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8";

            using (var webResponse = (HttpWebResponse)webRequest.GetResponse())
            {
                using (var reader = new StreamReader(webResponse.GetResponseStream(), Encoding.UTF8))
                {

                    html = reader.ReadToEnd();
                    reader.Close();
                    webResponse.Close();
                }
            }
            return html;
        }

        /// <summary>
        /// 执行JS
        /// </summary>
        /// <param name="sExpression">参数体</param>
        /// <param name="sCode">JavaScript代码的字符串</param>
        /// <returns></returns>
        private string ExecuteScript(string sExpression, string sCode)
        {
            MSScriptControl.ScriptControl scriptControl = new MSScriptControl.ScriptControl();
            scriptControl.UseSafeSubset = true;
            scriptControl.Language = "JScript";
            scriptControl.AddCode(sCode);
            try
            {
                string str = scriptControl.Eval(sExpression).ToString();
                return str;
            }
            catch (Exception ex)
            {
                string str = ex.Message;
            }
            return null;
        }
    }
}