字符串的编码如何转换

[cwchyt]

做了个提交软件，截取post数据有下面内容，如何转换成汉字？
%259B%2586%25E5%25A4%25A7%25E8%25B5%258C%25E5%25B1%2580%25E7%25AC%25AC%25E5%258D%

[bobui]

你的编码方式是什么啊 ？

[changjiangzhibin]

base64

[wdgphc]

UTF-8 最好用 Default

[qjlsharp]

学习了,帮你顶

[cwchyt]

我也不知道啊，post的时候，出现这种编码
如何转换为原来的字符？
我用 System.Web.HttpUtility 转换不回来

[cwchyt]

用 System.Web.HttpUtility 有一部分数据转换不出来啊

需要发送的数据

标题：手打文字版天擎第十七集大赌
内容：第十七集大赌局第十七节初吻前夕
第一，天道到底应该如何去学习。段天狼说着，顿了顿，我所说的，是真正的学习，不止是简单的记忆和模仿，而是要能够高度总结出其中的规律。如果做到这一步，那么，天道就几乎等于是一个人了。
几乎？孙云梦眨了眨眼睛，问道



抓取的post
POST /tableforum/App/newtopic_post.php HTTP/1.1
Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-ms-application, application/vnd.ms-xpsdocument, application/xaml+xml, application/x-ms-xbap, application/x-shockwave-flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*
Referer: http://bbs.eladies.sina.com.cn/tableforum/App/newtopic.php?bbsid=34&subid=17
Accept-Language: zh-cn
Content-Type: application/x-www-form-urlencoded
UA-CPU: x86
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 3.0.04506; .NET CLR 3.5.21022; InfoPath.2)
Host: bbs.eladies.sina.com.cn
Content-Length: 2825
Connection: Keep-Alive
Cache-Control: no-cache
Cookie: vjuids=-1da6bb948.11b2c635b40.0.f7f6e4e6de35a; vjlast=1216405188; sinaRotator/=24; SINA_NEWS_CUSTOMIZE_city=%u6CF0%u5B89; SINAGLOBAL=123.128.118.6.46101216388608996; SPHPSESSID=7sg2mt6k6ish6u42bpe2et97f2; Apache=123.128.118.6.54821216405159168; SE=81C09B8765E9414F759FF96FD1E2DDADDAA61BE08C65236D9DB49D5CB8834E85BD25F45C856BC94A39F8F58E0BD0FE33D615A9CAEE6FA01EE739ADA20C2ACBF6; SCT=11; SA=0%7C0%7C0%7C0%7C1%7C1%7C1%7C1%7C0%7C1%7C0%7C0%7C1%7C0%7C0%7C0%7C1%7C0%7C0%7C0%7C0%7C0%7C0%7C0%7C0%7C0; PS=0; SU=xcudwfxgzi0:2:1501902785:%E5%A4%A7%E5%86%A2%E5%AE%81%E5%AE%81:1216405183:::; SINAPRO=UL_8Z%3D%26_8_0z%26yMXPHM8xzkk_W%26%3D8%2FzkXxXZMyWac%3D%3DHYWz5a2k%2FW7at___c; UNIPROU=2:xcudwfxgzi0:0:::; nick=大冢宁宁(1501902785); appmask=00000000000000000000000000000004; gender=; SINA-AVATAR=0%7C0%7C0%7C0%7C1%7C1%7C1%7C1%7C0%7C1%7C0%7C0%7C1%7C0%7C0%7C0%7C1%7C0%7C0%7C0%7C0%7C0%7C0%7C0%7C0%7C0; SINAPROC=1; UNIPROTM=1216405183; islogin=1; enterClubTime=1216405185902; forum_bt=open; minimessage_21=true

checkwd=&stripubb=0&word=1&upcfg=200.0%7Cjpg%2Cgif%2Cpng%7C0%7C1%7C10&redo=2008-07-19+02%3A20%3A30%7C%25E7%25AC%25AC%25E5%258D%2581%25E4%25B8%2583%25E9%259B%2586%25E5%25A4%25A7%25E8%25B5%258C%25E5%25B1%2580%25E7%25AC%25AC%25E5%258D%2581%25E4%25B8%2583%25E8%258A%2582%25E5%2588%259D%25E5%2590%25BB%25E5%2589%258D%25E5%25A4%2595%253CBR%253E%25E7%25AC%25AC%25E4%25B8%2580%25EF%25BC%258C%25E5%25A4%25A9%25E9%2581%2593%25E5%2588%25B0%25E5%25BA%2595%25E5%25BA%2594%25E8%25AF%25A5%25E5%25A6%2582%25E4%25BD%2595%25E5%258E%25BB%25E5%25AD%25A6%25E4%25B9%25A0%25E3%2580%2582%25E6%25AE%25B5%25E5%25A4%25A9%25E7%258B%25BC%25E8%25AF%25B4%25E7%259D%2580%25EF%25BC%258C%25E9%25A1%25BF%25E4%25BA%2586%25E9%25A1%25BF%25EF%25BC%258C%25E6%2588%2591%25E6%2589%2580%25E8%25AF%25B4%25E7%259A%2584%25EF%25BC%258C%25E6%2598%25AF%25E7%259C%259F%25E6%25AD%25A3%25E7%259A%2584%25E5%25AD%25A6%25E4%25B9%25A0%25EF%25BC%258C%25E4%25B8%258D%25E6%25AD%25A2%25E6%2598%25AF%25E7%25AE%2580%25E5%258D%2595%25E7%259A%2584%25E8%25AE%25B0%25E5%25BF%2586%25E5%2592%258C%25E6%25A8%25A1%25E4%25BB%25BF%25EF%25BC%258C%25E8%2580%258C%25E6%2598%25AF%25E8%25A6%2581%25E8%2583%25BD%25E5%25A4%259F%25E9%25AB%2598%25E5%25BA%25A6%25E6%2580%25BB%25E7%25BB%2593%25E5%2587%25BA%25E5%2585%25B6%25E4%25B8%25AD%25E7%259A%2584%25E8%25A7%2584%25E5%25BE%258B%25E3%2580%2582%25E5%25A6%2582%25E6%259E%259C%25E5%2581%259A%25E5%2588%25B0%25E8%25BF%2599%25E4%25B8%2580%25E6%25AD%25A5%25EF%25BC%258C%25E9%2582%25A3%25E4%25B9%2588%25EF%25BC%258C%25E5%25A4%25A9%25E9%2581%2593%25E5%25B0%25B1%25E5%2587%25A0%25E4%25B9%258E%25E7%25AD%2589%25E4%25BA%258E%25E6%2598%25AF%25E4%25B8%2580%25E4%25B8%25AA%25E4%25BA%25BA%25E4%25BA%2586%25E3%2580%2582%253CBR%253E%25E5%2587%25A0%25E4%25B9%258E%25EF%25BC%259F%25E5%25AD%2599%25E4%25BA%2591%25E6%25A2%25A6%25E7%259C%25A8%25E4%25BA%2586%25E7%259C%25A8%25E7%259C%25BC%25E7%259D%259B%25EF%25BC%258C%25E9%2597%25AE%25E9%2581%2593&fms_newinfo=&bbsid=34&subid=17&fms_emote=1&jump=0&ismain=0&mytmp=&fms_title=%CA%D6%B4%F2%CE%C4%D7%D6%B0%E6%CC%EC%C7%E6%B5%DA%CA%AE%C6%DF%BC%AF%B4%F3%B6%C4&sublist=17&fms_body=%B5%DA%CA%AE%C6%DF%BC%AF%B4%F3%B6%C4%BE%D6%B5%DA%CA%AE%C6%DF%BD%DA%B3%F5%CE%C7%C7%B0%CF%A6%3CBR%3E%B5%DA%D2%BB%A3%AC%CC%EC%B5%C0%B5%BD%B5%D7%D3%A6%B8%C3%C8%E7%BA%CE%C8%A5%D1%A7%CF%B0%A1%A3%B6%CE%CC%EC%C0%C7%CB%B5%D7%C5%A3%AC%B6%D9%C1%CB%B6%D9%A3%AC%CE%D2%CB%F9%CB%B5%B5%C4%A3%AC%CA%C7%D5%E6%D5%FD%B5%C4%D1%A7%CF%B0%A3%AC%B2%BB%D6%B9%CA%C7%BC%F2%B5%A5%B5%C4%BC%C7%D2%E4%BA%CD%C4%A3%B7%C2%A3%AC%B6%F8%CA%C7%D2%AA%C4%DC%B9%BB%B8%DF%B6%C8%D7%DC%BD%E1%B3%F6%C6%E4%D6%D0%B5%C4%B9%E6%C2%C9%A1%A3%C8%E7%B9%FB%D7%F6%B5%BD%D5%E2%D2%BB%B2%BD%A3%AC%C4%C7%C3%B4%A3%AC%CC%EC%B5%C0%BE%CD%BC%B8%BA%F5%B5%C8%D3%DA%CA%C7%D2%BB%B8%F6%C8%CB%C1%CB%A1%A3%3CBR%3E%BC%B8%BA%F5%A3%BF%CB%EF%D4%C6%C3%CE%D5%A3%C1%CB%D5%A3%D1%DB%BE%A6%A3%AC%CE%CA%B5%C0&wenchuan=1&loginname=&passwd=

[蒋晟]

原来的字符是GB2312还是BIG5?