c#：使用百度翻译API

首先先在百度翻译开放平台上注册一下，然后得到两个关键值：App Id 和秘钥，有了这俩就可以直接写程序了。

写程序的时候参考一下开发手册

因为最后的返回结果是这样的

{"from":"en","to":"zh","trans_result":[{"src":"hello","dst":"\u4f60\u597d"}]}

先定义一个Translation.cs用了存放结果中的trans_result

public class Translation
{
    public string Src { get; set; }
    public string Dst { get; set; }
}

再定义一个TranslationResult存放上面结果的反序列化的结果

public class TranslationResult
{
    public string Error_code { get; set; }
    public string Error_msg { get; set; }
    public string From { get; set; }
    public string To { get; set; }
    public string Query { get; set; }
    public Translation[] Trans_result { get; set; }
}

之后是主体功能：拼接URL并访问然后得到结果
我现在使用的版本URL拼接格式是：
http://api.fanyi.baidu.com/api/trans/vip/translate?q=apple&from=en&to=zh&appid=2015063000000001&salt=1435660288&sign=f89f9594663708c1605f3d736d01d2d4
也就是百度翻译网址+要翻译的字符串+源语言+目的语言+appid+随机数字+md5校验值
这个有可能会变，反正这些帮助文档上写的都很详细

public static TranslationResult GetTranslationFromBaiduFanyi(String source, Language from = Language.Auto, Language to = Language.Auto)
{
    String jsonResult = String.Empty;
    String languageFrom = from.ToString().ToLower();
    String languageTo = to.ToString().ToLower();
    String appId = "123321123321";
    String randomNum = System.DateTime.Now.Millisecond.ToString();
    String md5Sign = GetMD5HashFromFile(appId + source + randomNum + "09090909090909");
    Console.WriteLine(appId + source + randomNum + "Cxdi54XVRAnuMAbOjCMr");
    String url = String.Format("http://api.fanyi.baidu.com/api/trans/vip/translate?q={0}&from={1}&to={2}&appid={3}&salt={4}&sign={5}",
        HttpUtility.UrlEncode(source, Encoding.UTF8),
        languageFrom,
        languageTo,
        appId,
        randomNum,
        md5Sign
        );
    Console.WriteLine(url);
    WebClient wc = new WebClient();
    try
    {
        jsonResult = wc.DownloadString(url);
    }
    catch (Exception e)
    {
        jsonResult = string.Empty;
        Console.WriteLine(e.Message);
    }
    JavaScriptSerializer jss = new JavaScriptSerializer();
    TranslationResult ret = jss.Deserialize<TranslationResult>(jsonResult);
    return ret;
}

上面用到的MD5在我之前的博客或者网上都能找到

还用到了一个枚举定义语言类型

public enum Language
{
    Auto = 0,
    ZH = 1,
    JP = 2,
    EN = 3,
    KOR = 4,
    SPA = 5,
    FRA = 6,
    TH = 7,
    ARA = 8,
    RU = 9,
    PT = 10,
    YUE = 11,
    WYW = 12,
    DE = 13,
    NL = 14,
    IT = 15,
    EL = 16
}

调用时

private static void Main(String[] args)
{
    TranslationResult result = TranslateUtil.GetTranslationFromBaiduFanyi("hello", TranslateUtil.Language.EN, TranslateUtil.Language.ZH);
    for (int i = 0; i < result.Trans_result.Length; i++)
    {
        Console.WriteLine(result.Trans_result[i].Dst);
    }
}

c#：使用百度翻译API

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