參考了http://topic.csdn.net/u/20091105/15/0d54b7b2-38fe-4cdf-ae1b-5a1f07c26ea0.html帖子18樓的代碼

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修改了一下，滿足了我實際的項目需求

using?System;
using?System.Collections.Generic;
using?System.Linq;
using?System.Text;
using?System.Web;

namespace?testProgram
{
????class?MyEncoding
????{

????????static?void?Main()
????????{
????????????MyEncoding?myEncoding?=?new?MyEncoding();
????????????//GB2312
????????????string?gb2312?=?"http://www.baidu.com/s?wd=%B9%A4%B3%A7%B9%A9%B5%E7";
????????????//utf8
????????????string?utf8?=?"http://www.google.com.hk/search?hl=zh-CN&newwindow=1&safe=strict&q=%25abc%E4%B8%AD%E5%9B%BD%2C%3B&btnG=Google+%E6%90%9C%E7%B4%A2&aq=f&aqi=&aql=&oq=&gs_rfai=";

????????????string?ss?=?myEncoding.UrlDecode(gb2312);
????????????string?ss1?=?myEncoding.UrlDecode(utf8);

????????????Console.WriteLine(ss);
????????????Console.WriteLine(ss1);

????????????Console.ReadLine();
????????}

????????private?string?UrlDecode(string?url)
????????{
????????????string?result?=?"";
????????????byte[]?buf?=?GetUrlCodingToBytes(url);
????????????if?(IsUTF8(buf))
????????????{
????????????????result?=?HttpUtility.UrlDecode(url,?Encoding.UTF8);
????????????}
????????????else
????????????{
????????????????result?=?HttpUtility.UrlDecode(url,?Encoding.GetEncoding("GB2312"));
????????????}
????????????return?result;
????????}

????????private?byte[]?GetUrlCodingToBytes(string?url)
????????{
????????????StringBuilder?sb?=?new?StringBuilder();

????????????int?i?=?url.IndexOf('%');
????????????while?(i?>=?0)
????????????{
????????????????if?(url.Length?<?i?+?3)
????????????????{
????????????????????break;
????????????????}
????????????????sb.Append(url.Substring(i,?3));
????????????????url?=?url.Substring(i?+?3);
????????????????i?=?url.IndexOf('%');
????????????}

????????????string?urlCoding?=?sb.ToString();
????????????if?(string.IsNullOrEmpty(urlCoding))
????????????????return?new?byte[0];

????????????urlCoding?=?urlCoding.Replace("%",?string.Empty);
????????????int?len?=?urlCoding.Length?/?2;
????????????byte[]?result?=?new?byte[len];
????????????len?*=?2;
????????????for?(int?index?=?0;?index?<?len;?index++)
????????????{
????????????????string?s?=?urlCoding.Substring(index,?2);
????????????????int?b?=?int.Parse(s,?System.Globalization.NumberStyles.HexNumber);
????????????????result[index?/?2]?=?(byte)b;
????????????????index++;
????????????}
????????????return?result;
????????}

????????private?bool?IsUTF8(byte[]?buf)
????????{
????????????int?i;
????????????byte?cOctets;?//?octets?to?go?in?this?UTF-8?encoded?character??
????????????bool?bAllAscii?=?true;
????????????long?iLen?=?buf.Length;
????????????cOctets?=?0;
????????????for?(i?=?0;?i?<?iLen;?i++)
????????????{
????????????????if?((buf[i]?&?0x80)?!=?0)?bAllAscii?=?false;

????????????????if?(cOctets?==?0)
????????????????{
????????????????????if?(buf[i]?>=?0x80)
????????????????????{
????????????????????????do
????????????????????????{
????????????????????????????buf[i]?<<=?1;
????????????????????????????cOctets++;
????????????????????????}
????????????????????????while?((buf[i]?&?0x80)?!=?0);

????????????????????????cOctets--;
????????????????????????if?(cOctets?==?0)
????????????????????????????return?false;
????????????????????}
????????????????}
????????????????else
????????????????{
????????????????????if?((buf[i]?&?0xC0)?!=?0x80)
????????????????????????return?false;
????????????????????cOctets--;
????????????????}
????????????}
????????????if?(cOctets?>?0)
????????????????return?false;
????????????if?(bAllAscii)
????????????????return?false;
????????????return?true;
????????}
????}
}

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轉(zhuǎn)載于:https://www.cnblogs.com/zhujie/archive/2010/09/16/1827910.html

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