C# Url 编码和解码

Baidu 默认的是gb2312 ，google 默认utf-8

//oStr 是UrlEncode编码字符串

Encoding gb2312 =Encoding.GetEncoding(“gb2312”);

Encoding utf-8=Encoding.UTF8;

//首先进行utf-8 进行 解码

String key =HttpUtility.UrlDecode(oStr,utf8);

//将解码的字符再次进行解码

String encode=HttpUtility.UrlEncode(key,utf8).ToLower();

//与原来编码进行对比，如果不一致，说明编码不正确，用gb2312进行解码

If(oStr!=encode)

{

Key=HttpUtility.UrlDecode(oStr,gb2312);

}