C# 谷歌翻译API

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

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

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

            Regex re = new Regex(@"(?<=tkk:')(.*?)(?=')");

            var TKK = re.Match(BaseResultHtml).ToString();//在返回的HTML中正则匹配TKK的值
            
            string path = Server.MapPath("~/");//获取路径

            string jspath = path + "/content/js/gettk.js";

            var GetTkkJS = System.IO.File.ReadAllText(jspath);

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

            string googleTransUrl = "https://translate.google.cn/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.cn/");

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

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

            return ResultText;
        }

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

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

            webRequest.Method = "GET";

            webRequest.CookieContainer = cookie;

            webRequest.Referer = refer;

            webRequest.Timeout = 20000;

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

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

            webRequest.UserAgent = " Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0)";

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

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


        /// 执行JS
        /// 
        /// 参数体
        /// JavaScript代码的字符串
        /// 
        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;
        }

gettk.js

var b = function (a, b) {
    for (var d = 0; d < b.length - 2; d += 3) {
        var c = b.charAt(d + 2),
            c = "a" <= c ? c.charCodeAt(0) - 87 : Number(c),
            c = "+" == b.charAt(d + 1) ? a >>> c : a << c;
        a = "+" == b.charAt(d) ? a + c & 4294967295 : a ^ c
    }
    return a
}

var tk = function (a, TKK) {
    for (var e = TKK.split("."), h = Number(e[0]) || 0, g = [], d = 0, f = 0; f < a.length; f++) {
        var c = a.charCodeAt(f);
        128 > c ? g[d++] = c : (2048 > c ? g[d++] = c >> 6 | 192 : (55296 == (c & 64512) && f + 1 < a.length && 56320 == (a.charCodeAt(f + 1) & 64512) ? (c = 65536 + ((c & 1023) << 10) + (a.charCodeAt(++f) & 1023), g[d++] = c >> 18 | 240, g[d++] = c >> 12 & 63 | 128) : g[d++] = c >> 12 | 224, g[d++] = c >> 6 & 63 | 128), g[d++] = c & 63 | 128)
    }
    a = h;
    for (d = 0; d < g.length; d++) a += g[d], a = b(a, "+-a^+6");
    a = b(a, "+-3^+b+-f");
    a ^= Number(e[1]) || 0;
    0 > a && (a = (a & 2147483647) + 2147483648);
    a %= 1E6;
    return a.toString() + "." + (a ^ h)
}

程序中有小改动

参考文章：https://www.cnblogs.com/marso/p/google_translate_api.html

线上可能出现一下问题：

请求这个方法异常：

Exception type: COMException
Exception message: 检索 COM 类工厂中 CLSID 为 {0E59F1D5-1FBE-11D0-8FF2-00A0D10038BC} 的组件失败，原因是出现以下错误: 80040154 没有注册类 (异常来自 HRESULT:0x80040154 (REGDB_E_CLASSNOTREG))

解决办法：

IIS7的话。在应用程序池的高级设置中，启用32位应用程序。

经过测试此方法有效

解决办法参考：https://blog.csdn.net/bianjing40/article/details/53419251