blocks|key|1577116|text|HttpUtility.ParseQueryString怎么样？|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1577117|只需添加一个对System.Web.dll的引用|1577118|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/ms150046.aspx^0|0|S|0|S|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@$9|S|A|T|1|U]]|E|$]]|$1|F|3|G|5|6|7|V|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]]]

How about <a href="http://msdn.microsoft.com/en-us/library/ms150046.aspx" rel="noreferrer"><code>HttpUtility.ParseQueryString</code></a>?

Just add a reference to System.Web.dll

blocks|key|1361950|text|HttpUtility.ParseQueryString()将查询字符串解析为NameValueCollection对象，将后者转换为IDictionary<string,+string>只需一个简单的foreach。然而，这可能是不必要的，因为NameValueCollection有一个索引器，所以它的行为非常像一个字典。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1361951|entityMap^0|0|U|13|J|1V|R|2T|7|3F|J|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]|$9|O|A|P|B|C]|$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|G|$]]

<code>HttpUtility.ParseQueryString()</code> parses query string into a <code>NameValueCollection</code> object, converting the latter to an <code>IDictionary&lt;string, string&gt;</code> is a matter of a simple <code>foreach</code>. This, however, might be unnecessary since <code>NameValueCollection</code> has an indexer, so it behaves pretty much like a dictionary.

blocks|key|1577180|text|为了一个单声道兼容的解决方案，我不得不这么做|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1577181|Regex.Matches(queryString,+"([%5E?=&]%2B)(=([%5E&]*))?").Cast<Match>().ToDictionary(x+=>+x.Groups[1].Value,+x+=>+x.Groups[3].Value)|code-block|syntax|javascript|1577182|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|$]]

Just had to do this for a mono compatible solution 

<pre><code>Regex.Matches(queryString, "([^?=&amp;]+)(=([^&amp;]*))?").Cast&lt;Match&gt;().ToDictionary(x =&gt; x.Groups[1].Value, x =&gt; x.Groups[3].Value)
</code></pre>

blocks|key|1362017|text|我喜欢Jon+Canning's+answer的简洁，但出于多样性的考虑，这里是他答案的另一种选择，它也适用于像Windows+phone8这样缺乏HttpUtility.ParseQueryString()实用程序的受限环境：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1362018|++++public+static+Dictionary<string,+string>+ParseQueryString(String+query)
++++{
++++++++Dictionary<String,+String>+queryDict+=+new+Dictionary<string,+string>();
++++++++foreach+(String+token+in+query.TrimStart(new+char[]+{+'?'+}).Split(new+char[]+{+'&'+},+StringSplitOptions.RemoveEmptyEntries))
++++++++{
++++++++++++string[]+parts+=+token.Split(new+char[]+{+'='+},+StringSplitOptions.RemoveEmptyEntries);
++++++++++++if+(parts.Length+==+2)
++++++++++++++++queryDict[parts[0].Trim()]+=+HttpUtility.UrlDecode(parts[1]).Trim();
++++++++++++else
++++++++++++++++queryDict[parts[0].Trim()]+=+"";
++++++++}
++++++++return+queryDict;
++++}|code-block|syntax|javascript|1362019|实际上，对Canning的答案的一个有用的改进是，它负责解码url编码值(如上面的解决方案)：|1362020|++++public+static+Dictionary<string,+string>+ParseQueryString2(String+query)
++++{
+++++++return+Regex.Matches(query,+"([%5E?=&]%2B)(=([%5E&]*))?").Cast<Match>().ToDictionary(x+=>+x.Groups[1].Value,+x+=>+HttpUtility.UrlDecode(+x.Groups[3].Value+));
++++}|1362021|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/15419842/522150^0|22|U|3|K|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|F|3|G|5|H|7|12|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|13|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|14|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|15|8|@]|D|@]|E|$]]]|P|$Q|$5|R|S|T|E|$U|V]]]]

I like the brevity of <a href="https://stackoverflow.com/a/15419842/522150">Jon Canning's answer</a>, but in the interest of variety, here is another alternative to his answer, that would also work for restricted environments like Windows Phone 8, that lack the <code>HttpUtility.ParseQueryString()</code> utility:

<pre><code> public static Dictionary&lt;string, string&gt; ParseQueryString(String query)
 {
 Dictionary&lt;String, String&gt; queryDict = new Dictionary&lt;string, string&gt;();
 foreach (String token in query.TrimStart(new char[] { '?' }).Split(new char[] { '&amp;' }, StringSplitOptions.RemoveEmptyEntries))
 {
 string[] parts = token.Split(new char[] { '=' }, StringSplitOptions.RemoveEmptyEntries);
 if (parts.Length == 2)
 queryDict[parts[0].Trim()] = HttpUtility.UrlDecode(parts[1]).Trim();
 else
 queryDict[parts[0].Trim()] = "";
 }
 return queryDict;
 }
</code></pre>

Actually, a useful improvement to Canning's answer that take care of decoding url-encoded values (like in the above solution) is:

<pre><code> public static Dictionary&lt;string, string&gt; ParseQueryString2(String query)
 {
 return Regex.Matches(query, "([^?=&amp;]+)(=([^&amp;]*))?").Cast&lt;Match&gt;().ToDictionary(x =&gt; x.Groups[1].Value, x =&gt; HttpUtility.UrlDecode( x.Groups[3].Value ));
 }
</code></pre>

blocks|key|1362047|text|我通常是这样做的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1362048|Dictionary<string,+string>+parameters+=+HttpContext.Current.Request.QueryString.Keys.Cast<string>()
++++.ToDictionary(k+=>+k,+v+=>+HttpContext.Current.Request.QueryString[v]);|code-block|syntax|javascript|1362049|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 how I usually do it

<pre><code>Dictionary&lt;string, string&gt; parameters = HttpContext.Current.Request.QueryString.Keys.Cast&lt;string&gt;()
 .ToDictionary(k =&gt; k, v =&gt; HttpContext.Current.Request.QueryString[v]);
</code></pre>

blocks|key|1362062|text|一个不带HttpUtility的衬垫|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1362063|var+dictionary+=+query.Replace("?",+"").Split('&').ToDictionary(x+=>+x.Split('=')[0],+x+=>+x.Split('=')[1]);|code-block|syntax|javascript|1362064|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|$]]

One liner without HttpUtility

<pre class="lang-cs prettyprint-override"><code>var dictionary = query.Replace("?", "").Split('&amp;').ToDictionary(x =&gt; x.Split('=')[0], x =&gt; x.Split('=')[1]);
</code></pre>

blocks|key|1362092|text|还有另一种方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1362093|NameValueCollection+nvcData+=+HttpUtility.ParseQueryString(queryString);
Dictionary<string,+string>+dictData+=+new+Dictionary<string,+string>(nvcData.Count);
foreach+(string+key+in+nvcData.AllKeys)
{
++++dictData.Add(key,+nvcData.Get(key));
}|code-block|syntax|javascript|1362094|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|$]]

Yet another way to do it:

<pre><code>NameValueCollection nvcData = HttpUtility.ParseQueryString(queryString);
Dictionary&lt;string, string&gt; dictData = new Dictionary&lt;string, string&gt;(nvcData.Count);
foreach (string key in nvcData.AllKeys)
{
 dictData.Add(key, nvcData.Get(key));
}
</code></pre>

blocks|key|1577368|text|与Sean相同，但使用Linq+(以及一个可以复制和粘贴的函数)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1577369|public+static+Dictionary<string,+string>+ParseQueryString(string+queryString)
{
+++var+nvc+=+HttpUtility.ParseQueryString(queryString);
+++return+nvc.AllKeys.ToDictionary(k+=>+k,+k+=>+nvc[k]);
}|code-block|syntax|javascript|1577370|此外，该问题还询问如何将其返回到查询字符串中：|1577371|public+static+string+CreateQueryString(Dictionary<string,+string>+parameters)
{
+++return+string.Join("&",+parameters.Select(kvp+=>+
++++++string.Format("{0}={1}",+kvp.Key,+HttpUtility.UrlEncode(kvp.Value))));
}|1577372|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]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Same as Sean, but with Linq (and a function you can copy and paste):

<pre><code>public static Dictionary&lt;string, string&gt; ParseQueryString(string queryString)
{
 var nvc = HttpUtility.ParseQueryString(queryString);
 return nvc.AllKeys.ToDictionary(k =&gt; k, k =&gt; nvc[k]);
}
</code></pre>

Also, the question asked how to get it back into a query string:

<pre><code>public static string CreateQueryString(Dictionary&lt;string, string&gt; parameters)
{
 return string.Join("&amp;", parameters.Select(kvp =&gt; 
 string.Format("{0}={1}", kvp.Key, HttpUtility.UrlEncode(kvp.Value))));
}
</code></pre>

blocks|key|1577381|text|最简单的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1577382|Dictionary<string,+string>+parameters+=+new+Dictionary<string,+string>();

for+(int+i+=+0;+i+<+context.Request.QueryString.Count;+i%2B%2B)
{
++++parameters.Add(context.Request.QueryString.GetKey(i),+context.Request.QueryString[i]);
}|code-block|syntax|javascript|1577383|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|$]]

Most simple:

<pre><code>Dictionary&lt;string, string&gt; parameters = new Dictionary&lt;string, string&gt;();

for (int i = 0; i &lt; context.Request.QueryString.Count; i++)
{
 parameters.Add(context.Request.QueryString.GetKey(i), context.Request.QueryString[i]);
}
</code></pre>

blocks|key|1577414|text|在ASP.NET核心中，使用ParseQuery。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1577415|var+query+=+HttpContext.Request.QueryString.Value;
var+queryDictionary+=+Microsoft.AspNetCore.WebUtilities.QueryHelpers.ParseQuery(query);|code-block|syntax|javascript|1577416|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.webutilities.queryhelpers.parsequery^0|E|A|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

In ASP.NET Core, use <a href="https://docs.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.webutilities.queryhelpers.parsequery" rel="noreferrer">ParseQuery</a>.

<pre><code>var query = HttpContext.Request.QueryString.Value;
var queryDictionary = Microsoft.AspNetCore.WebUtilities.QueryHelpers.ParseQuery(query);
</code></pre>

blocks|key|1577465|text|您可以通过使用FromQueryAttribute修饰参数来获得它|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1577466|public+void+Action([FromQuery]+Dictionary<string,+string>+queries)
{
++++...
}|code-block|syntax|javascript|1577467|备注:如果您想为每个键获取多个值，可以将字典更改为Dictionary<string,+List<string>>|1577468|entityMap^0|7|I|0|0|P|W|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|N|$]]

You can just get it by decorating the parameter with the <code>FromQueryAttribute</code>

<pre><code>public void Action([FromQuery] Dictionary&lt;string, string&gt; queries)
{
 ...
}
</code></pre>

P.S. If you want to get multiple values for each key you can change the Dictionary to <code>Dictionary&lt;string, List&lt;string&gt;&gt;</code>

I'm looking for the simplest way of converting a query string from an HTTP GET request into a Dictionary, and back again.

I figure it's easier to carry out various manipulations on the query once it is in dictionary form, but I seem to have a lot of code just to do the conversion. Any recommended ways?

Best way to convert query string to dictionary in C#

Windows

我正在寻找将查询字符串从HTTP GET请求转换为字典，然后再转换回来的最简单方法。我认为，一旦以字典的形式对查询执行各种操作就会更容易，但我似乎有很多代码来进行转换。有什么推荐的方法吗？

问在C#中将查询字符串转换为字典的最佳方法
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