利用谷歌网站的翻译网站，实现谷歌翻译api

代码是之前网上找到的，地址为：http://www.crifan.com/teach_you_how_to_find_free_google_translate_api/

原先的代码有不足，如果翻译里包含两个句子，google会返回多句，代码只能获得第一句的翻译，所以这里做了一定的修改。

因为这个api是利用google自己网站的api，说不定哪天更新了就不能用了，所以要用趁早。

static public string TranslateGoogleString(string strToTranslate, string fromLanguage, string toLanguage)
{
string translatedStr = "";
string transRetHtml = "";

string encodedStr = HttpUtility.UrlEncode(strToTranslate);
string googleTransBaseUrl = "http://translate.google.cn/translate_a/t?";
string googleTransUrl = googleTransBaseUrl;
googleTransUrl += "&client=" + "t";
googleTransUrl += "&text=" + encodedStr;
googleTransUrl += "&hl=" + "zh-CN";
googleTransUrl += "&sl=" + fromLanguage;// source   language
googleTransUrl += "&tl=" + toLanguage;  // to       language
googleTransUrl += "&ie=" + "UTF-8";     // input    encode
googleTransUrl += "&oe=" + "UTF-8";     // output   encode

try
{
var bytes = new WebClient().DownloadData(googleTransUrl);
transRetHtml = Encoding.UTF8.GetString(bytes);

var index = transRetHtml.IndexOf("]],");
transRetHtml = transRetHtml.Substring(0, index+1).Replace("[[", "");

foreach (Match m in new Regex(@"\[""(.+?)"","".+?"","".+?"",""\w*""\]").Matches(transRetHtml))
{
var s = m.Value.TrimEnd(']') + ",";
var g2 = new Regex(@"""(.+?)"",").Match(s).Groups;
if (g2.Count >= 2)
{
translatedStr += g2[1].Value;
}
}

}
catch(Exception ex)
{
Console.WriteLine(ex);
}

return translatedStr;
}