blocks|key|4481118|text|如果您不想使用System.Web.HttpUtility+(因此可以使用客户端配置文件)，您仍然可以使用Mono+HttpUtility.cs，它只是一个可以嵌入到应用程序中的独立.cs文件。然后，您可以简单地在类中使用ParseQueryString方法来正确地解析查询字符串。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4481119|entityMap|0|LINK|mutability|MUTABLE|url|http://www.java2s.com/Open-Source/CSharp/2.6.4-mono-.net-core/System.Web/System/Web/HttpUtility.cs.htm^0|7|M|33|G|1H|J|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]|$9|Q|A|R|B|C]]|D|@$9|S|A|T|1|U]]|E|$]]|$1|F|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

If you don't want to use <code>System.Web.HttpUtility</code> (thus be able to use the client profile), you can still use <a href="http://www.java2s.com/Open-Source/CSharp/2.6.4-mono-.net-core/System.Web/System/Web/HttpUtility.cs.htm" rel="nofollow">Mono HttpUtility.cs</a> which is only an independent .cs file that you can embed in your application. Then you can simply use the <code>ParseQueryString</code> method inside the class to parse the query string properly.

blocks|key|787879|text|这就是为什么你应该使用Uri和HttpUtility.ParseQueryString。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|787880|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/system.uri.aspx|1|http://msdn.microsoft.com/en-us/library/system.web.httputility.parsequerystring.aspx^0|B|3|0|F|S|1|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]|$A|R|B|S|1|T]]|C|$]]|$1|D|3|-4|5|6|7|U|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]|L|$5|G|H|I|C|$J|M]]]]

And that's why you should use <a href="http://msdn.microsoft.com/en-us/library/system.uri.aspx" rel="nofollow">Uri</a> and <a href="http://msdn.microsoft.com/en-us/library/system.web.httputility.parsequerystring.aspx" rel="nofollow">HttpUtility.ParseQueryString</a>.

blocks|key|4481175|text|如果你真的需要自己做解析，并且只对'q‘的值感兴趣，那么下面的方法是可行的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4481176|++++++++string+url+=+@"http://www.google.com.mt/search?"+%2B
++++++++++++"client=firefoxa&rls=org.mozilla%253Aen-"+%2B
++++++++++++"US%253Aofficial&channel=s&hl=mt&source=hp&"+%2B
++++++++++++"biw=986&bih=663&q=hotmail&meta=&btnG=Fittex%2Bbil-Google";

++++++++int+question+=+url.IndexOf("?");
++++++++if(question>-1)
++++++++{
++++++++++++int+qindex+=+url.IndexOf("q=",+question);
++++++++++++if+(qindex+>+-1)
++++++++++++{
++++++++++++++++int+ampersand+=+url.IndexOf('&',+qindex);
++++++++++++++++string+token+=+null;

++++++++++++++++if+(ampersand+>+-1)
++++++++++++++++++++token+=+url.Substring(qindex%2B2,+ampersand+-+qindex+-+2);
++++++++++++++++else
++++++++++++++++++++token+=+url.Substring(qindex%2B2);

++++++++++++++++Console.WriteLine(token);
++++++++++++}
++++++++}|code-block|syntax|javascript|4481177|但一定要尝试使用合适的URL解析器，这将在未来为您省去很多麻烦。|4481178|(已修改此问题，以包括对“？”的检查。标记，并支持查询字符串末尾的'q‘值(末尾不带'&’)|4481179|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

If you really need to do the parsing yourself, and are only interested in the value for 'q' then the following would work:

<pre><code> string url = @"http://www.google.com.mt/search?" +
 "client=firefoxa&amp;rls=org.mozilla%3Aen-" +
 "US%3Aofficial&amp;channel=s&amp;hl=mt&amp;source=hp&amp;" +
 "biw=986&amp;bih=663&amp;q=hotmail&amp;meta=&amp;btnG=Fittex+bil-Google";

 int question = url.IndexOf("?");
 if(question&gt;-1)
 {
 int qindex = url.IndexOf("q=", question);
 if (qindex &gt; -1)
 {
 int ampersand = url.IndexOf('&amp;', qindex);
 string token = null;

 if (ampersand &gt; -1)
 token = url.Substring(qindex+2, ampersand - qindex - 2);
 else
 token = url.Substring(qindex+2);

 Console.WriteLine(token);
 }
 }
</code></pre>

But do try to look at using a proper URL parser, it will save you a lot of hassle in the future.

(amended this question to include a check for the '?' token, and support 'q' values at the end of the query string (without the '&amp;' at the end) )

blocks|key|4481204|text|为什么不创建一个代码，返回从q=到下一个&的字符串|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4481205|例如：|4481206|4481207|字符串s=+historyString.Substring(url.IndexOf("q="))；|blockquote|4481208|4481209|int+newIndex+=+s.IndexOf("&")；|4481210|string+newString+=+s.Substring(0，newIndex)；|4481211|4481212|干杯|4481213|entityMap^0|E|2|K|1|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@$9|W|A|X|B|C]|$9|Y|A|Z|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|10|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|11|8|@]|D|@]|E|$]]|$1|I|3|J|5|K|7|12|8|@]|D|@]|E|$]]|$1|L|3|-4|5|6|7|13|8|@]|D|@]|E|$]]|$1|M|3|N|5|6|7|14|8|@]|D|@]|E|$]]|$1|O|3|P|5|6|7|15|8|@]|D|@]|E|$]]|$1|Q|3|-4|5|6|7|16|8|@]|D|@]|E|$]]|$1|R|3|S|5|6|7|17|8|@]|D|@]|E|$]]|$1|T|3|-4|5|6|7|18|8|@]|D|@]|E|$]]]|U|$]]

Why don't you create a code which returns the string from the <code>q=</code> onwards till the next <code>&amp;</code>?
For example:
<blockquote>
string s = historyString.Substring(url.IndexOf(&quot;q=&quot;));
int newIndex = s.IndexOf(&quot;&amp;&quot;);
string newString = s.Substring(0, newIndex);
</blockquote>
Cheers

blocks|key|2689494|text|现在还不清楚为什么你不想使用HttpUtility。您可以随时添加对System.Web的引用并使用它：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2689495|var+parsedQuery+=+HttpUtility.ParseQueryString(input);
Console.WriteLine(parsedQuery["q"]);|code-block|syntax|javascript|2689496|如果这不是一种选择，那么这种方法可能会有所帮助：|2689497|var+query+=+input.Split('&')
+++++++++++++++++.Single(s+=>+s.StartsWith("q="))
+++++++++++++++++.Substring(2);
Console.WriteLine(query);|2689498|它在&上拆分，并查找以"q="开头的单个拆分结果，并采用位置2处的子字符串返回=符号之后的所有内容。假设只有一个匹配，这对于这种情况似乎是合理的，否则将抛出异常。如果不是这样，那么用Where替换Single，遍历结果并在循环中执行相同的子字符串操作。|2689499|EDIT:以涵盖注释中提到的场景此更新版本可以使用：|BOLD|2689500|int+index+=+input.IndexOf('?');
var+query+=+input.Substring(index+%2B+1)
+++++++++++++++++.Split('&')
+++++++++++++++++.SingleOrDefault(s+=>+s.StartsWith("q="));

if+(query+!=+null)
++++Console.WriteLine(query.Substring(2));|2689501|entityMap^0|Y|A|0|0|0|0|2|1|B|4|13|1|2J|5|2Q|6|0|0|5|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@$9|Y|A|Z|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|10|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|11|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|12|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|13|8|@$9|14|A|15|B|C]|$9|16|A|17|B|C]|$9|18|A|19|B|C]|$9|1A|A|1B|B|C]|$9|1C|A|1D|B|C]]|D|@]|E|$]]|$1|Q|3|R|5|6|7|1E|8|@$9|1F|A|1G|B|S]]|D|@]|E|$]]|$1|T|3|U|5|H|7|1H|8|@]|D|@]|E|$I|J]]|$1|V|3|-4|5|6|7|1I|8|@]|D|@]|E|$]]]|W|$]]

It's not clear why you don't want to use HttpUtility. You could always add a reference to <code>System.Web</code> and use it:

<pre><code>var parsedQuery = HttpUtility.ParseQueryString(input);
Console.WriteLine(parsedQuery["q"]);
</code></pre>

If that's not an option then perhaps this approach will help:

<pre><code>var query = input.Split('&amp;')
 .Single(s =&gt; s.StartsWith("q="))
 .Substring(2);
Console.WriteLine(query);
</code></pre>

It splits on <code>&amp;</code> and looks for the single split result that begins with <code>"q="</code> and takes the substring at position 2 to return everything after the <code>=</code> sign. The assumption is that there will be a single match, which seems reasonable for this case, otherwise an exception will be thrown. If that's not the case then replace <code>Single</code> with <code>Where</code>, loop over the results and perform the same substring operation in the loop.

EDIT: to cover the scenario mentioned in the comments this updated version can be used:

<pre><code>int index = input.IndexOf('?');
var query = input.Substring(index + 1)
 .Split('&amp;')
 .SingleOrDefault(s =&gt; s.StartsWith("q="));

if (query != null)
 Console.WriteLine(query.Substring(2));
</code></pre>

blocks|key|2406012|text|使用可用的工具：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2406013|String+UrlStr+=+"http://www.google.com.mt/search?client=firefox-a&rls=org.mozilla%253Aen-US%253Aofficial&channel=s&hl=mt&source=hp&biw=986&bih=663&q=hotmail&meta=&btnG=Fittex%2Bbil-Google";

NameValueCollection+Items+=+HttpUtility.ParseQueryString(UrlStr);

String+QValue+=+Items["q"];|code-block|syntax|javascript|2406014|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Use the tools available:

<pre><code>String UrlStr = "http://www.google.com.mt/search?client=firefox-a&amp;rls=org.mozilla%3Aen-US%3Aofficial&amp;channel=s&amp;hl=mt&amp;source=hp&amp;biw=986&amp;bih=663&amp;q=hotmail&amp;meta=&amp;btnG=Fittex+bil-Google";

NameValueCollection Items = HttpUtility.ParseQueryString(UrlStr);

String QValue = Items["q"];
</code></pre>

blocks|key|2406050|text|HttpUtility适用于.Net框架。然而，该类不适用于WinRT应用程序。如果你想从Windows+Store+App的url中获取参数，你需要使用WwwFromUrlDecoder。您可以使用要从中获取参数的查询字符串从这个类创建一个对象，该对象有一个枚举器，并且还支持lambda表达式。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2406051|下面是一个例子|2406052|var+stringUrl+=+"http://localhost/?name=Jonathan&lastName=Morales";
var+decoder+=+new+WwwFormUrlDecoder(stringUrl);
//Using+GetFirstByName+method
string+nameValue+=+decoder.GetFirstByName("name");
//nameValue+has+"Jonathan"

//Using+Lambda+Expressions
var+parameter+=+decoder.FirstOrDefault(p+=>+p.Name.Contains("last"));+//IWwwFormUrlDecoderEntry+variable+type
string+parameterName+=+parameter.Name;+//lastName
string+parameterValue+=+parameter.Value;+//Morales|code-block|syntax|javascript|2406053|您还可以查看http://www.dzhang.com/blog/2012/08/21/parsing-uri-query-strings-in-windows-8-metro-style-apps|offset|length|2406054|entityMap|0|LINK|mutability|MUTABLE|url|http://www.dzhang.com/blog/2012/08/21/parsing-uri-query-strings-in-windows-8-metro-style-apps^0|0|0|0|6|2L|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|X|8|@]|9|@$K|Y|L|Z|1|10]]|A|$]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

HttpUtility is fine for the .Net Framework. However that class is not available for WinRT apps. If you want to get the parameters from a url in a Windows Store App you need to use WwwFromUrlDecoder. You create an object from this class with the query string you want to get the parameters from, the object has an enumerator and supports also lambda expressions. 

Here's an example

<pre><code>var stringUrl = "http://localhost/?name=Jonathan&amp;lastName=Morales";
var decoder = new WwwFormUrlDecoder(stringUrl);
//Using GetFirstByName method
string nameValue = decoder.GetFirstByName("name");
//nameValue has "Jonathan"

//Using Lambda Expressions
var parameter = decoder.FirstOrDefault(p =&gt; p.Name.Contains("last")); //IWwwFormUrlDecoderEntry variable type
string parameterName = parameter.Name; //lastName
string parameterValue = parameter.Value; //Morales
</code></pre>

You can also see <a href="http://www.dzhang.com/blog/2012/08/21/parsing-uri-query-strings-in-windows-8-metro-style-apps" rel="nofollow">http://www.dzhang.com/blog/2012/08/21/parsing-uri-query-strings-in-windows-8-metro-style-apps</a>

blocks|key|788071|text|以下是解决方案-|type|unstyled|depth|inlineStyleRanges|entityRanges|data|788072|string+GetQueryString(string+url,+string+key)
{
++++string+query_string+=+string.Empty;

++++var+uri+=+new+Uri(url);
++++var+newQueryString+=+HttpUtility.ParseQueryString(uri.Query);
++++query_string+=+newQueryString[key].ToString();

++++return+query_string;
}|code-block|syntax|javascript|788073|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

here is the solution -

<pre><code>string GetQueryString(string url, string key)
{
 string query_string = string.Empty;

 var uri = new Uri(url);
 var newQueryString = HttpUtility.ParseQueryString(uri.Query);
 query_string = newQueryString[key].ToString();

 return query_string;
}
</code></pre>

I am reading from history, and I want that when i come across a google query, I can extract the query string. I am not using request or httputility since i am simply parsing a string. however, when i come across URLs like this, my program fails to parse it properly:

<a href="http://www.google.com.mt/search?client=firefox-a&amp;rls=org.mozilla%3Aen-US%3Aofficial&amp;channel=s&amp;hl=mt&amp;source=hp&amp;biw=986&amp;bih=663&amp;q=hotmail&amp;meta=&amp;btnG=Fittex+bil-Google" rel="noreferrer">http://www.google.com.mt/search?client=firefox-a&amp;rls=org.mozilla%3Aen-US%3Aofficial&amp;channel=s&amp;hl=mt&amp;source=hp&amp;biw=986&amp;bih=663&amp;q=hotmail&amp;meta=&amp;btnG=Fittex+bil-Google</a>

what i was trying to do is get the index of q= and the index of &amp; and take the words in between but in this case the index of &amp; will be smaller than q= and it will give me errors.

any suggestions?

thanks for your answers, all seem good :) p.s. i couldn't use httputility, not I don't want to. when i add a reference to system.web, httputility isn't included! it's only included in an asp.net application. Thanks again

extract query string from a URL string

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

文章

问答

视频

学习中心

腾讯云实验室

直播

竞赛

腾讯云代码分析专区

腾讯iOA零信任安全管理系统专区

腾讯云架构师技术同盟交流圈

腾讯云数据库专区

腾讯云顾问专区

腾讯云原生专区

腾讯混元专区

腾讯云TCE专区

腾讯云Lighthouse专区

腾讯云HAI专区

腾讯云Edgeone专区

腾讯云存储专区

腾讯云智能专区

腾讯轻联专区 

腾讯云开发专区

TAPD专区

腾讯轻量云游戏服专区

腾讯云最具价值专家

腾讯云架构师技术同盟

腾讯云创作之星

腾讯云开发者先锋

腾讯云代码助手

云原生构建

TAPD 敏捷项目管理

Cloud Studio

SDK中心

API中心

命令行工具

涵盖代码开发、场景应用、自动测试全流程，助你从零构建专属AI助手

一站式MCP教程库，解锁AI应用新玩法

我正在阅读历史，我希望当我遇到google查询时，我可以提取查询字符串。我没有使用request或httputility，因为我只是在解析一个字符串。然而，当我遇到这样的URL时，我的程序无法正确地解析它：我试图做的是得到q=的索引和&的索引，然后取中间的单词，但在本例中，&的索引将小于q=，它会给出错误。有什么建议吗...

问从URL字符串中提取查询字符串
EN

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问从URL字符串中提取查询字符串EN