关于C#窗体应用程序调用google翻译api的问题

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.IO;
using TranslationAPI;
using JSONUtil;

namespace DrawToolsLib
{
class HandWhiteTarans
{
/// <summary>
/// 使用WebRequest获取Google翻译后的内容
/// </summary>
/// <param name="strTranslateString">需要翻译的内容</param>
/// <param name="strRequestLanguage">原文语种</param>
/// <param name="strResultLanguage">译文语种</param>
/// <returns></returns>

private string GetGoogleTrans(string strTransString,string strRequesLanguage,string strResultLanguage)
{
WebRequest request = HttpWebRequest.Create(
"http://ajax.googleapis.com/ajax/services/language/translate?v=1.0&q=" + strTransString + "&langpair=" + strRequesLanguage + "%7C" + strResultLanguage
);
request.Credentials = CredentialCache.DefaultCredentials;
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
Stream dataStream = response.GetResponseStream();
StreamReader reader = new StreamReader(dataStream);
string responseFromServer = reader.ReadToEnd();
reader.Close();
dataStream.Close();
response.Close();
return responseFromServer;
}

public string MultiLanguageTranslate(string strTranslateString, string
strRequestLanguage, string strResultLanguage)
{
try
{
if (!string.IsNullOrEmpty(strTranslateString))
{
TranslateString transtring = (TranslateString)Newtonsoft.Json.JsonConvert.DeserializeObject(GetGoogleTrans(strTranslateString,strRequestLanguage,strResultLanguage),typeof(TranslateString));
if (transtring.responseStatus == 200)
return transtring.responseData.translatedText;
else
return "There was an error.";
}
else
{
return strTranslateString;
}
}
catch (Exception e)
{
return e.Message;
}
}

/// <summary>
/// 翻译
/// 默认地将英文翻译成简体中文
/// </summary>
/// <param name="TranslateString">需要翻译的内容</param>
/// <returns></returns>
public string TranslateEnglishToChinese(string strTranslateString)
{
return MultiLanguageTranslate(strTranslateString, "en", "zh-CN");
}

/// <summary>
/// 翻译
/// 默认地将简体中文翻译成英文
/// </summary>
/// <param name="TranslateString">需要翻译的内容</param>
/// <returns></returns>
public string TranslateChineseToEnglish(string strTranslateString)
{
return MultiLanguageTranslate(strTranslateString, "zh-CN", "en");
}

}

/// <summary>
/// 译文的反系列化类
/// </summary>
public class TranslateString
{
private TranslatedText responsedata;
public TranslatedText responseData
{
get { return responsedata; }
set { responsedata = value; }
}
private string responsedetails;
public string responseDetails
{
get { return responsedetails; }
set { responsedetails = value; }
}
private int responsestatus;
public int responseStatus
{
get { return responsestatus; }
set { responsestatus = value; }
}
/**/
/// <summary>
/// 译文内容
/// </summary>
public class TranslatedText
{
private string translatedtext;
public string translatedText
{
get { return translatedtext; }
set { translatedtext = value; }
}
}
}

private void btnTrans_Click(object sender, RoutedEventArgs e)
{
string t;
HandWhiteTarans ht = new HandWhiteTarans();
if (Regex.Match(inkEdit.Text, @"(?isn)^((?<chinese>[/u4E00-/u9FA5]+)|(?<letter>[a-z]+)|(?<num>/d+))$").Success)
{
t = ht.TranslateChineseToEnglish(inkEdit.Text);
isSpace = false;
inkEdit.Text = t;
return;
}
if(Regex.Match(inkEdit.Text,@"^[A_Za_z]").Success)
{
t = ht.TranslateEnglishToChinese(inkEdit.Text);
isSpace = false;
inkEdit.Text = t;
return;
}
}