功能了！
介绍 Azure 认识服务中 Language 分类中的文本翻译服务(Translator Text API 
支持多种语言。使用者可用于构建应用程序、网站、工具或任何需要多语言支持的解决方案。该服务是通过 REST API 提供的，所以我们可以以任何语言来调用它们。本文笔者使用 C# 通过构建一个 WPF 程序来演示如何通过简单的几步就能创建一个像模像样的翻译程序：
。
TEXT_TRANSLATION_API_ENDPOINT = BING_SPELL_CHECK_API_ENDPOINT = ;
WebRequest.Headers.Add(,);
TEXT_TRANSLATION_API_SUBSCRIPTION_KEY = BING_SPELL_CHECK_API_SUBSCRIPTION_KEY = ;
。
获取支持的语言列表
支持哪些语言！下面的请求能够返回翻译服务支持的语言列表：
uri = TEXT_TRANSLATION_API_ENDPOINT + ;
代码封装到下面的函数中：
支持的语言
uri = TEXT_TRANSLATION_API_ENDPOINT + =添加认证信息
WebRequest.Headers.Add(=
</span><span style="color: #008000">//</span><span style="color: #008000"> 把返回的 xml 信息抽取到数组中</span>
response =<span style="color: #000000"> WebRequest.GetResponse();
</span><span style="color: #0000ff">using</span> (Stream stream =<span style="color: #000000"> response.GetResponseStream())
{
DataContractSerializer dcs </span>= <span style="color: #0000ff">new</span> DataContractSerializer(<span style="color: #0000ff">typeof</span>(List<<span style="color: #0000ff">string</span>><span style="color: #000000">));
List</span><<span style="color: #0000ff">string</span>> languagesForTranslate = (List<<span style="color: #0000ff">string</span>><span style="color: #000000">)dcs.ReadObject(stream);
languageCodes </span>=<span style="color: #000000"> languagesForTranslate.ToArray();
}
}
函数后，languageCodes 中的内容如下图所示：
内容是无法显示给用户的，还需要把它们转换成对用户友好的名称，因此我们定义 GetLanguageNames 函数完成这个功能：
SortedDictionary<,> languageCodesAndTitles =
SortedDictionary<,>(Comparer<>.Create((a,b) => .Compare(a,b, 中文的语言名称
uri = TEXT_TRANSLATION_API_ENDPOINT + == = = DataContractSerializer(Type.GetType( (Stream stream =
</span><span style="color: #008000">//</span><span style="color: #008000"> 把返回的 xml 信息抽取到数组中</span>
<span style="color: #0000ff">var</span> response =<span style="color: #000000"> request.GetResponse();
</span><span style="color: #0000ff">string</span><span style="color: #000000">[] languageNames;
</span><span style="color: #0000ff">using</span> (Stream stream =<span style="color: #000000"> response.GetResponseStream())
{
languageNames </span>= (<span style="color: #0000ff">string</span><span style="color: #000000">[])dcs.ReadObject(stream);
}
</span><span style="color: #008000">//</span><span style="color: #008000"> 把<a href="/tag/zhichi/" target="_blank" class="keywords">支持</a>的语言列表及其友好<a href="/tag/mingcheng/" target="_blank" class="keywords">名称</a>保存到字典数据结构中，
</span><span style="color: #008000">//</span><span style="color: #008000"> 随后会把它们绑定给 combo <a href="/tag/Box/" target="_blank" class="keywords">Box</a> 控件进行<a href="/tag/xianshi/" target="_blank" class="keywords">显示</a></span>
<span style="color: #0000ff">for</span> (<span style="color: #0000ff">int</span> i = <span style="color: #800080">0</span>; i < languageNames.Length; i++<span style="color: #000000">)
{
languageCodesAndTitles.Add(languageNames[i],languageCodes[i]);
}
}
支持翻译的语言列表后，就可以通过 UI 控件把它们显示出来：
count = ( menuItem Box.Items.Add(menuItem);
ToLanguageComboBox.Items.Add(menuItem);
}
</span><span style="color: #008000">//</span><span style="color: #008000"> 设置默认的源语言和目标语言</span>
FromLanguageCombo<a href="/tag/Box/" target="_blank" class="keywords">Box</a>.SelectedItem = <span style="color: #800000">"</span><span style="color: #800000">英语</span><span style="color: #800000">"</span><span style="color: #000000">;
ToLanguageCombo<a href="/tag/Box/" target="_blank" class="keywords">Box</a>.SelectedItem </span>= <span style="color: #800000">"</span><span style="color: #800000">简体<a href="/tag/zhongwen/" target="_blank" class="keywords">中文</a></span><span style="color: #800000">"</span><span style="color: #000000">;}
中文"：
TEXT_TRANSLATION_API_ENDPOINT + + 待翻译文本 + + 源语言 + + 目标语言
功能的函数：
TranslateButton_Click( textToTranslate = fromLanguage =Box.SelectedValue.ToString();
fromLanguageCode = toLanguageCode =Box.SelectedValue.ToString()];
</span><span style="color: #008000">//</span><span style="color: #008000"> 如果要翻译的文本是英语，还可以进行拼写检查</span>
<span style="color: #0000ff">if</span> (fromLanguageCode == <span style="color: #800000">"</span><span style="color: #800000">en</span><span style="color: #800000">"</span><span style="color: #000000">)
{
textToTranslate </span>=<span style="color: #000000"> CorrectSpelling(textToTranslate);
</span><span style="color: #008000">//</span><span style="color: #008000"> 把更新后的文本保存到 UI 控件上</span>
TextToTranslate.Text =<span style="color: #000000"> textToTranslate;
}
</span><span style="color: #008000">//</span><span style="color: #008000"> 处理文本为空和不需要翻译的情况</span>
<span style="color: #0000ff">if</span> (textToTranslate == <span style="color: #800000">""</span> || fromLanguageCode ==<span style="color: #000000"> toLanguageCode)
{
TranslatedText.Text </span>=<span style="color: #000000"> textToTranslate;
</span><span style="color: #0000ff">return</span><span style="color: #000000">;
}
</span><span style="color: #008000">//</span><span style="color: #008000"> 通过 http 请求执行翻译任务</span>
<span style="color: #0000ff">string</span> uri = <span style="color: #0000ff">string</span>.Format(TEXT_TRANSLATION_API_ENDPOINT + <span style="color: #800000">"</span><span style="color: #800000">Translate?text=</span><span style="color: #800000">"</span> +<span style="color: #000000">
System.Web.HttpUtility.UrlEncode(textToTranslate) </span>+ <span style="color: #800000">"</span><span style="color: #800000">&from={0}&to={1}</span><span style="color: #800000">"</span><span style="color: #000000">,fromLanguageCode,toLanguageCode);
</span><span style="color: #0000ff">var</span> translationWebRequest =<span style="color: #000000"> HttpWebRequest.Create(uri);
translationWebRequest.Headers.Add(</span><span style="color: #800000">"</span><span style="color: #800000">Ocp-Apim-Subscription-Key</span><span style="color: #800000">"</span><span style="color: #000000">,TEXT_TRANSLATION_API_SUBSCRIPTION_KEY);
WebResponse response </span>= <span style="color: #0000ff">null</span><span style="color: #000000">;
response </span>=<span style="color: #000000"> translationWebRequest.GetResponse();
</span><span style="color: #008000">//</span><span style="color: #008000"> 把返回的翻译结果抽取到 UI 控件中</span>
Stream stream =<span style="color: #000000"> response.GetResponseStream();
StreamReader translatedStream </span>= <span style="color: #0000ff">new</span> StreamReader(stream,Encoding.GetEncoding(<span style="color: #800000">"</span><span style="color: #800000">utf-8</span><span style="color: #800000">"</span><span style="color: #000000">));
System.Xml.XmlDocument xmlResponse </span>= <span style="color: #0000ff">new</span><span style="color: #000000"> System.Xml.XmlDocument();
xmlResponse.LoadXml(translatedStream.ReadToEnd());
TranslatedText.Text </span>=<span style="color: #000000"> xmlResponse.InnerText;}
调用翻译文本的 API 前，需要先从 UI 控件中取得用户设置的源语言和目标语言，并且还要对放在 url 中传输的文本内容进行编码：
uri = .Format(TEXT_TRANSLATION_API_ENDPOINT + ++ ,toLanguageCode);
函数中的：
(fromLanguageCode == =
TextToTranslate.Text =
函数中：
CorrectSpelling( uri = BING_SPELL_CHECK_API_ENDPOINT +
HttpWebRequest spellCheckWebRequest == = ;
</span><span style="color: #008000">//</span><span style="color: #008000"> 把文本<a href="/tag/neirong/" target="_blank" class="keywords">内容</a>放在请求的 body 中</span>
<span style="color: #0000ff">string</span> body = <span style="color: #800000">"</span><span style="color: #800000">text=</span><span style="color: #800000">"</span> +<span style="color: #000000"> System.Web.HttpUtility.UrlEncode(text);
</span><span style="color: #0000ff">byte</span>[] data =<span style="color: #000000"> Encoding.UTF8.GetBytes(body);
spellCheckWebRequest.ContentLength </span>=<span style="color: #000000"> data.Length;
</span><span style="color: #0000ff">using</span> (<span style="color: #0000ff">var</span> requestStream =<span style="color: #000000"> spellCheckWebRequest.GetRequestStream())
requestStream.Write(data,</span><span style="color: #800080">0</span><span style="color: #000000">,data.Length);
HttpWebResponse response </span>=<span style="color: #000000"> (HttpWebResponse)spellCheckWebRequest.GetResponse();
</span><span style="color: #008000">//</span><span style="color: #008000"> 从返回中取出 json 格式的拼写检查结果</span>
<span style="color: #0000ff">var</span> serializer = <span style="color: #0000ff">new</span><span style="color: #000000"> System.Web.Script.Serialization.JavaScriptSerializer();
</span><span style="color: #0000ff">var</span> responseStream =<span style="color: #000000"> response.GetResponseStream();
</span><span style="color: #0000ff">var</span> jsonString = <span style="color: #0000ff">new</span> StreamReader(responseStream,Encoding.GetEncoding(<span style="color: #800000">"</span><span style="color: #800000">utf-8</span><span style="color: #800000">"</span><span style="color: #000000">)).ReadToEnd();
</span><span style="color: #0000ff">dynamic</span> jsonResponse =<span style="color: #000000"> serializer.DeserializeObject(jsonString);
</span><span style="color: #0000ff">var</span> flaggedTokens = jsonResponse[<span style="color: #800000">"</span><span style="color: #800000">flaggedTokens</span><span style="color: #800000">"</span><span style="color: #000000">];
</span><span style="color: #008000">//</span><span style="color: #008000"> 我们定义一个规则来应用拼写检查的结果，
</span><span style="color: #008000">//</span><span style="color: #008000"> 比如：当拼写检查的权值大于 0.7 时就用建议的值替换掉文本中的值。</span>
<span style="color: #0000ff">var</span> corrections = <span style="color: #0000ff">new</span> SortedDictionary<<span style="color: #0000ff">int</span>,<span style="color: #0000ff">string</span>[]>(Comparer<<span style="color: #0000ff">int</span>>.Create((a,b) =><span style="color: #000000"> b.CompareTo(a)));
</span><span style="color: #0000ff">for</span> (<span style="color: #0000ff">int</span> i = <span style="color: #800080">0</span>; i < flaggedTokens.Length; i++<span style="color: #000000">)
{
</span><span style="color: #0000ff">var</span> correction =<span style="color: #000000"> flaggedTokens[i];
</span><span style="color: #0000ff">var</span> suggestion = correction[<span style="color: #800000">"</span><span style="color: #800000">suggestions</span><span style="color: #800000">"</span>][<span style="color: #800080">0</span><span style="color: #000000">];
</span><span style="color: #0000ff">if</span> (suggestion[<span style="color: #800000">"</span><span style="color: #800000"><a href="/tag/score/" target="_blank" class="keywords">score</a></span><span style="color: #800000">"</span>] > (<span style="color: #0000ff">decimal</span>)<span style="color: #800080">0.7</span><span style="color: #000000">)
corrections[(</span><span style="color: #0000ff">int</span>)correction[<span style="color: #800000">"</span><span style="color: #800000">offset</span><span style="color: #800000">"</span>]] = <span style="color: #0000ff">new</span> <span style="color: #0000ff">string</span><span style="color: #000000">[]
{ correction[</span><span style="color: #800000">"</span><span style="color: #800000">token</span><span style="color: #800000">"</span>],suggestion[<span style="color: #800000">"</span><span style="color: #800000">suggestion</span><span style="color: #800000">"</span><span style="color: #000000">] };
}
</span><span style="color: #0000ff">foreach</span> (<span style="color: #0000ff">int</span> i <span style="color: #0000ff">in</span><span style="color: #000000"> corrections.Keys)
{
</span><span style="color: #0000ff">var</span> oldtext = corrections[i][<span style="color: #800080">0</span><span style="color: #000000">];
</span><span style="color: #0000ff">var</span> newtext = corrections[i][<span style="color: #800080">1</span><span style="color: #000000">];
</span><span style="color: #0000ff">if</span> (text.Substring(i,oldtext.Length).All(<span style="color: #0000ff">char</span>.IsUpper)) newtext =<span style="color: #000000"> newtext.ToUpper();
</span><span style="color: #0000ff">else</span> <span style="color: #0000ff">if</span> (<span style="color: #0000ff">char</span>.IsUpper(text[i])) newtext = newtext[<span style="color: #800080">0</span>].ToString().ToUpper() + newtext.Substring(<span style="color: #800080">1</span><span style="color: #000000">);
text </span>= text.Substring(<span style="color: #800080">0</span>,i) + newtext + text.Substring(i +<span style="color: #000000"> oldtext.Length);
}
</span><span style="color: #0000ff">return</span><span style="color: #000000"> text;
}
代码可以看出，拼写检查只是给出一些建议，具体怎么做还是由用户决定的。比如上面的代码中当拼写检查的权值大于 0.7 时就用建议的值替换掉文本中的值。下面我们来测试一下拼写检查的逻辑，运行程序，并输入 "helo world!" 进行翻译：
代码逻辑在检测到待翻译的语言为英语时，会先进行代码的拼写检查：
显示拼写检查函数 CorrectSpelling 纠正了我们的拼写错误，下面是翻译的结果：
代码的拼写检查，是不是感觉这个程序有点 "智能" 的味道啦！
