C# 中文在URL中的编码 utf8 gb2312

C# 中文在URL中的编码

正在研究一个程序，输入一个关键字，能够把这个关键字发送到Google，yahoo等搜索引擎，进行搜索，然后打开结果网页。原理很简单。比如在Google搜索China，搜索结果页面的URL就是“http://www.google.com/search?hl=zh-CN&q=China&lr=”。只要替换红颜色的内容，就可以按照不同的关键字搜索。

但是如果关键字是中文，就会出现问题。比如在google搜索“中国”，Url是“http://www.google.com/search?hl=zh-CN&newwindow=1&q=中国&lr=”。汉字“中国”被按照UTF-8的格式进行编码。

不仅汉字进行编码，一些特殊字符也会进行编码。比如搜索“C#”，URL是“http://www.google.com/search?hl=zh-CN&newwindow=1&q=C#&lr=”。

一般来说，国外的网站都是按照UTF-8编码，而“百度”是按照“GB2312”进行编码的。比如搜索“中国”，URL是“http://www.baidu.com/s?wd=�й�&cl=3”

我们对比一下：C#中国的编码

编码 结果 网站
UTF-8 C#中国 Google
GB2312 C#�й� BaiDu

总结：
UTF-8中，一个汉字对应三个字节，GB2312中一个汉字占用两个字节。
不论何种编码，字母数字都不编码，特殊符号编码后占用一个字节。

//按照UTF-8进行编码
string tempSearchString1 = System.Web.HttpUtility.UrlEncode("C#中国");
//按照GB2312进行编码
string tempSearchString2 = System.Web.HttpUtility.UrlEncode("C#中国",System.Text.Encoding.GetEncoding("GB2312"));

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【转】ASP.NET中c#的URL编码处理
要解决的问题:
将下面的URL作为一个参数传到其他的页面
1 http://domain/de.apx?uid=12&page=15
2 url后面的参数中出现汉字等,如: ....aspx?title=起重机
在出现上面的情况的时候,必须经过一个RUL编码和解码的过程,否则会出现错误.

代码如下:

//传值
string temp = " 添加到收藏夹");

//在另外一个文件中取从上面传的值
if (Request.QueryString["url"] != null)
{
<wbr><wbr><wbr> string url = Server.UrlDecode(Request.QueryString["url"].ToString());<br><wbr><wbr><wbr> this.txtAddress.Text = url;<br> }<br> if (Request.QueryString["title"] != null)<br> {<br><wbr><wbr><wbr> string title = Server.UrlDecode(Request.QueryString["title"].ToString());<br><wbr><wbr><wbr> this.txtTitle.Text = title;<br> }</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>

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//-----------------------------------------------

URL编码对照表

1、string s = System.Web.HttpUtility(byte[] data);

这里的s即为转换出来的URL编码，需要注意的是这里的byte数组必须是具有ASCII意义的数组，由string通过System.Text.Encoding.Default.getBytes(str.ToCharArray());是不正确的，不能正确转义！

2、根据URL编码规则写个小程序

private string UrlEncode(byte[] byt)
<wbr> {<wbr><wbr><br><wbr><wbr><wbr><wbr> string<wbr> desstr = "";<wbr><wbr><br><wbr><wbr><wbr><wbr> for(int i=0; i<br><wbr><wbr><wbr><wbr> {<wbr><wbr><br><wbr><wbr><wbr><wbr><wbr> desstr += "%";<wbr><wbr><br><wbr><wbr><wbr><wbr><wbr> desstr += byt[i].ToString("X2");<wbr><wbr><br><wbr><wbr><wbr><wbr> }<br><wbr><wbr><wbr><wbr> return desstr;<br><wbr> }</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>

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以下是URL编码对照表：

backspace
tab<wbr><wbr><wbr><wbr><wbr><wbr><br> linefeed<wbr><br> creturn<wbr><wbr><br> space<wbr><wbr><wbr><wbr><br> !<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> !<br> "<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> "<br> #<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> #<br> $<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> $<br> %<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> %<br> &amp;<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> &amp;<br> '<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> '<br> (<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> (<br> )<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> )<br> *<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> *<br> +<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> +<br> ,<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> ,<br> -<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> -<br> .<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> .<br> /<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> /<br> 0<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> 0<br> 1<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> 1<br> 2<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> 2<br> 3<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> 3<br> 4<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> 4<br> 5<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> 5<br> 6<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> 6<br> 7<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> 7<br> 8<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> 8<br> 9<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> 9<br> :<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> :<br> ;<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> ;<br> &lt;<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> &lt;<br> =<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> =<br> &gt;<wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>