拍拍尘土

google:
Encoding enc = Encoding.GetEncoding("UTF-8");
Response.Write( System.Web.HttpUtility.UrlDecode("%E8%B0%B7%E6%AD%8C",enc));
结果为“谷歌”

baidu:
Encoding enc = Encoding.GetEncoding("gb2312");
Response.Write( System.Web.HttpUtility.UrlDecode("%D7%AA%BB%BB",enc));
结果为“转换”

编码的时候：
Response.Write(System.Web.HttpUtility.UrlEncode("百度", Encoding.Default ));
Response.Write(System.Web.HttpUtility.UrlEncode("百度",System.Text.Encoding.GetEncoding("gb2312")));