blocks|key|1630041|text|我刚才回答了一个similar+question。基本上，最好的方法是使用类HttpValueCollection，QueryString属性实际上是.NET框架的内部属性。您可以使用Reflector获取它(并将其放入您的Utils类中)。通过这种方式，您可以像处理NameValueCollection一样操作查询字符串，但所有的url编码/解码问题都会自行处理。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1630042|HttpValueCollection扩展了NameValueCollection，并具有一个接受编码的查询字符串(包括与号和问号)的构造函数，并且它覆盖了ToString()方法，以便稍后从底层集合重新构建查询字符串。|1630043|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/229925/outputing-a-manipulated-querystring-in-c/^0|12|J|1M|B|8|G|0|0|0|J|M|J|26|A|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]|$9|S|A|T|B|C]]|D|@$9|U|A|V|1|W]]|E|$]]|$1|F|3|G|5|6|7|X|8|@$9|Y|A|Z|B|C]|$9|10|A|11|B|C]|$9|12|A|13|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|14|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]]]

I answered a <a href="https://stackoverflow.com/questions/229925/outputing-a-manipulated-querystring-in-c/">similar question</a> a while ago. Basically, the best way would be to use the class <code>HttpValueCollection</code>, which the <code>QueryString</code> property actually is, unfortunately it is internal in the .NET framework.
You could use Reflector to grab it (and place it into your Utils class). This way you could manipulate the query string like a NameValueCollection, but with all the url encoding/decoding issues taken care for you.

<code>HttpValueCollection</code> extends <code>NameValueCollection</code>, and has a constructor that takes an encoded query string (ampersands and question marks included), and it overrides a <code>ToString()</code> method to later rebuild the query string from the underlying collection.

blocks|key|1415281|text|如果它是HttpRequest.QueryString，那么您可以将集合复制到一个可写的集合中，并随心所欲地使用它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1415282|NameValueCollection+filtered+=+new+NameValueCollection(request.QueryString);
filtered.Remove("Language");|code-block|syntax|javascript|1415283|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|$]]

If it's the HttpRequest.QueryString then you can copy the collection into a writable collection and have your way with it.

<pre><code>NameValueCollection filtered = new NameValueCollection(request.QueryString);
filtered.Remove("Language");
</code></pre>

blocks|key|1415477|text|这里有一个简单的方法。不需要反射器。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1415478|++++public+static+string+GetQueryStringWithOutParameter(string+parameter)
++++{
++++++++var+nameValueCollection+=+System.Web.HttpUtility.ParseQueryString(HttpContext.Current.Request.QueryString.ToString());
++++++++nameValueCollection.Remove(parameter);
++++++++string+url+=+HttpContext.Current.Request.Path+%2B+"?"+%2B+nameValueCollection;

++++++++return+url;
++++}|code-block|syntax|javascript|1415479|这里需要QueryString.ToString()，因为Request.QueryString集合是只读的。|offset|length|style|CODE|1415480|entityMap^0|0|0|4|M|T|J|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]|$I|T|J|U|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|N|$]]

Here is a simple way. Reflector is not needed.

<pre><code> public static string GetQueryStringWithOutParameter(string parameter)
 {
 var nameValueCollection = System.Web.HttpUtility.ParseQueryString(HttpContext.Current.Request.QueryString.ToString());
 nameValueCollection.Remove(parameter);
 string url = HttpContext.Current.Request.Path + "?" + nameValueCollection;

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

Here <code>QueryString.ToString()</code> is required because <code>Request.QueryString</code> collection is read only.

blocks|key|1415395|text|最后，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1415396|hmemcpy回答完全是给我的，并感谢其他回答的朋友。|1415397|我使用Reflector获取HttpValueCollection，并编写了以下代码|1415398|++++++++var+hebe+=+new+HttpValueCollection();
++++++++hebe.Add(HttpUtility.ParseQueryString(Request.Url.Query));

++++++++if+(!string.IsNullOrEmpty(hebe["Language"]))
++++++++++++hebe.Remove("Language");

++++++++Response.Redirect(Request.Url.AbsolutePath+%2B+"?"+%2B+hebe+);|code-block|syntax|javascript|1415399|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|O|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|P|8|@]|9|@]|A|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Finally,

hmemcpy answer was totally for me and thanks to other friends who answered.

I grab the HttpValueCollection using Reflector and wrote the following code

<pre><code> var hebe = new HttpValueCollection();
 hebe.Add(HttpUtility.ParseQueryString(Request.Url.Query));

 if (!string.IsNullOrEmpty(hebe["Language"]))
 hebe.Remove("Language");

 Response.Redirect(Request.Url.AbsolutePath + "?" + hebe );
</code></pre>

blocks|key|1630140|text|我个人的偏好是重写查询或在较低的点上使用namevaluecollection，但有时业务逻辑使这些都不是很有用，有时反射确实是您所需要的。在这些情况下，您可以暂时关闭只读标志，如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1630141|//+reflect+to+readonly+property
PropertyInfo+isreadonly+=+typeof(System.Collections.Specialized.NameValueCollection).GetProperty("IsReadOnly",+BindingFlags.Instance+%7C+BindingFlags.NonPublic);

//+make+collection+editable
isreadonly.SetValue(this.Request.QueryString,+false,+null);

//+remove
this.Request.QueryString.Remove("foo");

//+modify
this.Request.QueryString.Set("bar",+"123");

//+make+collection+readonly+again
isreadonly.SetValue(this.Request.QueryString,+true,+null);|code-block|syntax|javascript|1630142|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|$]]

My personal preference here is rewriting the query or working with a namevaluecollection at a lower point, but there are times where the business logic makes neither of those very helpful and sometimes reflection really is what you need. In those circumstances you can just turn off the readonly flag for a moment like so:

<pre><code>// reflect to readonly property
PropertyInfo isreadonly = typeof(System.Collections.Specialized.NameValueCollection).GetProperty("IsReadOnly", BindingFlags.Instance | BindingFlags.NonPublic);

// make collection editable
isreadonly.SetValue(this.Request.QueryString, false, null);

// remove
this.Request.QueryString.Remove("foo");

// modify
this.Request.QueryString.Set("bar", "123");

// make collection readonly again
isreadonly.SetValue(this.Request.QueryString, true, null);
</code></pre>

blocks|key|1415523|text|试试这个。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1415524|PropertyInfo+isreadonly+++=typeof(System.Collections.Specialized.NameValueCollection).GetProperty("IsReadOnly",+BindingFlags.Instance+%7C+BindingFlags.NonPublic);++++

isreadonly.SetValue(this.Request.QueryString,+false,+null);
this.Request.QueryString.Remove("foo");|code-block|syntax|javascript|1415525|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|$]]

Try this ...

<pre><code>PropertyInfo isreadonly =typeof(System.Collections.Specialized.NameValueCollection).GetProperty("IsReadOnly", BindingFlags.Instance | BindingFlags.NonPublic); 

isreadonly.SetValue(this.Request.QueryString, false, null);
this.Request.QueryString.Remove("foo");
</code></pre>

blocks|key|1415206|text|获取querystring集合，将其解析为(name=value+pair)字符串(不包括要删除的字符串)，并将其命名为newQueryString|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1415207|然后调用Response.Redirect(known_path?newqueryString)；|1415208|entityMap^0|M|F|0|4|18|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|P|8|@]|D|@]|E|$]]]|I|$]]

Get the querystring collection, parse it into a (<code>name=value pair</code>) string, excluding the one you want to REMOVE, and name it newQueryString

Then call <code>Response.Redirect(known_path?newqueryString)</code>;

blocks|key|1415047|text|您可能希望使用正则表达式来查找要从querystring中删除的参数，然后删除它并将浏览器重定向到与新的querystring相同的文件。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1415048|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

You're probably going to want use a Regular Expression to find the parameter you want to remove from the querystring, then remove it and redirect the browser to the same file with your new querystring.

blocks|key|1415098|text|是的，.NET中没有内置用于编辑查询字符串的类。您必须使用正则表达式或其他方法来修改字符串本身。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1415099|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Yes, there are no classes built into .NET to edit query strings. You'll have to either use Regex or some other method of altering the string itself.

blocks|key|1630197|text|如果您已经将查询字符串作为字符串，则还可以使用简单的字符串操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1630198|int+pos+=+queryString.ToLower().IndexOf("parameter=");
if+(pos+>=+0)
{
++++int+pos_end+=+queryString.IndexOf("&",+pos);
++++if+(pos_end+>=+0)+++//+there+are+additional+parameters+after+this+one
++++++++queryString+=+queryString.Substring(0,+pos)+%2B+queryString.Substring(pos_end+%2B+1);
++++else
++++++++if+(pos+==+0)+//+this+one+is+the+only+parameter
++++++++++++queryString+=+"";
++++++++else++++++++//+this+one+is+the+last+parameter
++++++++++++queryString=queryString.Substring(0,+pos+-+1);
}|code-block|syntax|javascript|1630199|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|$]]

If you have already the Query String as a string, you can also use simple string manipulation:

<pre><code>int pos = queryString.ToLower().IndexOf("parameter=");
if (pos &gt;= 0)
{
 int pos_end = queryString.IndexOf("&amp;", pos);
 if (pos_end &gt;= 0) // there are additional parameters after this one
 queryString = queryString.Substring(0, pos) + queryString.Substring(pos_end + 1);
 else
 if (pos == 0) // this one is the only parameter
 queryString = "";
 else // this one is the last parameter
 queryString=queryString.Substring(0, pos - 1);
}
</code></pre>

blocks|key|1415575|text|我有一个简单的解决方案，但是涉及到一点javascript。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1415576|假设查询字符串为"ok=1“|1415577|++++string+url+=+Request.Url.AbsoluteUri.Replace("&ok=1",+"");
+++url+=+Request.Url.AbsoluteUri.Replace("?ok=1",+"");
++Response.Write("<script>window.location+=+'"%2Burl%2B"';</script>");|code-block|syntax|javascript|1415578|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

well I have a simple solution , but there is a little javascript involve.

assuming the Query String is "ok=1"

<pre><code> string url = Request.Url.AbsoluteUri.Replace("&amp;ok=1", "");
 url = Request.Url.AbsoluteUri.Replace("?ok=1", "");
 Response.Write("&lt;script&gt;window.location = '"+url+"';&lt;/script&gt;");
</code></pre>

blocks|key|1415595|text|string+queryString+=+"Default.aspx?Agent=10&Language=2";+//Request.QueryString.ToString();
string+parameterToRemove="Language";+++//parameter+which+we+want+to+remove
string+regex=string.Format("(&{0}=[%5E&\s]%2B%7C{0}=[%5E&\s]%2B&?)",parameterToRemove);
string+finalQS+=+Regex.Replace(queryString,+regex,+"");|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1415596|https://regexr.com/3i9vj|unstyled|offset|length|1415597|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|O|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|Q|8|@]|9|@$G|R|H|S|1|T]]|A|$]]|$1|I|3|-4|5|F|7|U|8|@]|9|@]|A|$]]]|J|$K|$5|L|M|N|A|$O|E]]]]

<pre><code>string queryString = "Default.aspx?Agent=10&amp;Language=2"; //Request.QueryString.ToString();
string parameterToRemove="Language"; //parameter which we want to remove
string regex=string.Format("(&amp;{0}=[^&amp;\s]+|{0}=[^&amp;\s]+&amp;?)",parameterToRemove);
string finalQS = Regex.Replace(queryString, regex, "");
</code></pre>

<a href="https://regexr.com/3i9vj" rel="nofollow noreferrer">https://regexr.com/3i9vj</a>

blocks|key|1630336|text|将查询字符串解析为NameValueCollection。删除项目。并使用toString将其转换回查询字符串。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1630337|using+System.Collections.Specialized;

NameValueCollection+filteredQueryString+=+System.Web.HttpUtility.ParseQueryString(Request.QueryString.ToString());
filteredQueryString.Remove("appKey");

var+queryString+=+'?'%2B+filteredQueryString.ToString();|code-block|syntax|javascript|1630338|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|$]]

Parse Querystring into a NameValueCollection. Remove an item. And use the toString to convert it back to a querystring.

<pre><code>using System.Collections.Specialized;

NameValueCollection filteredQueryString = System.Web.HttpUtility.ParseQueryString(Request.QueryString.ToString());
filteredQueryString.Remove("appKey");

var queryString = '?'+ filteredQueryString.ToString();
</code></pre>

I want remove &quot;Language&quot; querystring from my url. How can I do this? (using Asp.net 3.5 , c#)
<pre><code>Default.aspx?Agent=10&amp;Language=2
</code></pre>
I want to remove &quot;Language=2&quot;, but language would be the first,middle or last. So I will have this
<pre><code>Default.aspx?Agent=20
</code></pre>

How can I remove item from querystring in asp.net using c#?

我想从我的url中删除"Language“querystring。我该怎么做呢？(使用Asp.net 3.5、c#)Default.aspx?Agent=10&Language=2我想删除"Language=2"，但language将是第一个、中间或最后一个。所以我要这个Default.aspx?Agent=20

问如何使用c#从asp.net中的查询字符串中删除项？
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问如何使用c#从asp.net中的查询字符串中删除项？
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