blocks|key|2759099|text|Removing+(Deleting)+Querystring+in+ASP.NET|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2759100|Request.QueryString.Remove("editFlag")|code-block|syntax|javascript|2759101|如果执行上述操作，将会出现错误|2759102|2759103|集合是只读的。|blockquote|2759104|2759105|2759106|因此，在删除查询字符串之前，我们需要编写以下代码。|2759107|试试这条路|2759108|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("editFlag");|2759109|您也可以尝试这种方式|2759110|++++var+nvc+=+HttpUtility.ParseQueryString(Request.Url.Query);
++++nvc.Remove("editFlag");
++++string+url+=+Request.Url.AbsolutePath+%2B+"?"+%2B+nvc.ToString();
+++++Response.Redirect(url);|2759111|希望这能有所帮助|2759112|entityMap|0|LINK|mutability|MUTABLE|url|http://www.codeproject.com/Tips/177679/Removing-Deleting-Querystring-in-ASP-NET^0|0|16|0|0|0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1A|8|@]|9|@$A|1B|B|1C|1|1D]]|C|$]]|$1|D|3|E|5|F|7|1E|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|1F|8|@]|9|@]|C|$]]|$1|K|3|-4|5|6|7|1G|8|@]|9|@]|C|$]]|$1|L|3|M|5|N|7|1H|8|@]|9|@]|C|$]]|$1|O|3|-4|5|6|7|1I|8|@]|9|@]|C|$]]|$1|P|3|-4|5|6|7|1J|8|@]|9|@]|C|$]]|$1|Q|3|R|5|6|7|1K|8|@]|9|@]|C|$]]|$1|S|3|T|5|6|7|1L|8|@]|9|@]|C|$]]|$1|U|3|V|5|F|7|1M|8|@]|9|@]|C|$G|H]]|$1|W|3|X|5|6|7|1N|8|@]|9|@]|C|$]]|$1|Y|3|Z|5|F|7|1O|8|@]|9|@]|C|$G|H]]|$1|10|3|11|5|6|7|1P|8|@]|9|@]|C|$]]|$1|12|3|-4|5|6|7|1Q|8|@]|9|@]|C|$]]]|13|$14|$5|15|16|17|C|$18|19]]]]

<h1><a href="http://www.codeproject.com/Tips/177679/Removing-Deleting-Querystring-in-ASP-NET" rel="noreferrer">Removing (Deleting) Querystring in ASP.NET</a></h1>
<pre><code>Request.QueryString.Remove(&quot;editFlag&quot;)
</code></pre>
If you do the above, you will get an error
<blockquote>
collection is read-only.
</blockquote>
So, we need to write the below code before deleting the query string.
Try this way
<pre><code>PropertyInfo isreadonly = 
 typeof(System.Collections.Specialized.NameValueCollection).GetProperty(
 &quot;IsReadOnly&quot;, BindingFlags.Instance | BindingFlags.NonPublic);
// make collection editable
isreadonly.SetValue(this.Request.QueryString, false, null);
// remove
this.Request.QueryString.Remove(&quot;editFlag&quot;);
</code></pre>
You can also try this way
<pre><code> var nvc = HttpUtility.ParseQueryString(Request.Url.Query);
 nvc.Remove(&quot;editFlag&quot;);
 string url = Request.Url.AbsolutePath + &quot;?&quot; + nvc.ToString();
 Response.Redirect(url);
</code></pre>
Hope this helps

blocks|key|2971991|text|我借用了@Amarnath+Balasubramanian上面的答案，并使它成为一个方便的函数，也可以很容易地在VB.NET中调用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2971992|public+static+bool+RemoveQueryString(ref+System.Web.HttpRequest+httpReq,+string+key)
{
++++PropertyInfo+requestQueryString+=+null;
++++bool+bCanProceed+=+true;
++++try+{
++++++++try+{
++++++++++++requestQueryString+=+typeof(System.Collections.Specialized.NameValueCollection).GetProperty("IsReadOnly",+BindingFlags.Instance+%7C+BindingFlags.NonPublic);
++++++++}+catch+(System.Reflection.AmbiguousMatchException)+{
++++++++++++bCanProceed+=+false;
++++++++}+catch+(System.ArgumentNullException)+{
++++++++++++bCanProceed+=+false;
++++++++}
++++++++if+(bCanProceed)+{
++++++++++++try+{
++++++++++++++++if+(requestQueryString+!=+null)+{
++++++++++++++++++++//+make+collection+editable
++++++++++++++++++++requestQueryString.SetValue(httpReq.QueryString,+false,+null);
++++++++++++++++}+else+bCanProceed+=+false;

++++++++++++}+catch+(System.Reflection.TargetException)+{
++++++++++++++++bCanProceed+=+false;
++++++++++++}+catch+(System.Reflection.TargetParameterCountException)+{
++++++++++++++++bCanProceed+=+false;
++++++++++++}+catch+(System.Reflection.TargetInvocationException)+{
++++++++++++++++bCanProceed+=+false;
++++++++++++}+catch+(System.MethodAccessException)+{
++++++++++++++++bCanProceed+=+false;
++++++++++++}+catch+(System.ArgumentException)+{
++++++++++++++++bCanProceed+=+false;
++++++++++++}
++++++++++++if+(bCanProceed)+{
++++++++++++++++try+{
++++++++++++++++++++//+remove
++++++++++++++++++++httpReq.QueryString.Remove(key);
++++++++++++++++}+catch+(System.NotSupportedException)+{
++++++++++++++++++++bCanProceed+=+false;
++++++++++++++++}
++++++++++++}
++++++++}
++++}+catch+(System.Exception)+{
++++++++bCanProceed+=+false;
++++}
++++return+bCanProceed;
}|code-block|syntax|javascript|2971993|要从VB.NET调用它，请执行以下操作：|2971994|RemoveQueryString(Me.Request,+"some_query_key_here")|2971995|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|$]]

I have taken the liberty in @Amarnath Balasubramanian 's answer above,
 and made it a handy function that can be easily called in VB.NET too.

<pre><code>public static bool RemoveQueryString(ref System.Web.HttpRequest httpReq, string key)
{
 PropertyInfo requestQueryString = null;
 bool bCanProceed = true;
 try {
 try {
 requestQueryString = typeof(System.Collections.Specialized.NameValueCollection).GetProperty("IsReadOnly", BindingFlags.Instance | BindingFlags.NonPublic);
 } catch (System.Reflection.AmbiguousMatchException) {
 bCanProceed = false;
 } catch (System.ArgumentNullException) {
 bCanProceed = false;
 }
 if (bCanProceed) {
 try {
 if (requestQueryString != null) {
 // make collection editable
 requestQueryString.SetValue(httpReq.QueryString, false, null);
 } else bCanProceed = false;

 } catch (System.Reflection.TargetException) {
 bCanProceed = false;
 } catch (System.Reflection.TargetParameterCountException) {
 bCanProceed = false;
 } catch (System.Reflection.TargetInvocationException) {
 bCanProceed = false;
 } catch (System.MethodAccessException) {
 bCanProceed = false;
 } catch (System.ArgumentException) {
 bCanProceed = false;
 }
 if (bCanProceed) {
 try {
 // remove
 httpReq.QueryString.Remove(key);
 } catch (System.NotSupportedException) {
 bCanProceed = false;
 }
 }
 }
 } catch (System.Exception) {
 bCanProceed = false;
 }
 return bCanProceed;
}
</code></pre>

To call this from VB.NET:

<pre><code>RemoveQueryString(Me.Request, "some_query_key_here")
</code></pre>

blocks|key|2972020|text|如果您担心将来页面回发运行的代码与您打算在querystring具有值时运行的代码相同，只需添加一个if(!Page.IsPostBack)条件即可。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2972021|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|$]]

If you are concerned about future page postbacks running the same code you intended to run when querystring has a value, simply add a if(!Page.IsPostBack) condition.

blocks|key|2759198|text|如果你想清除整个QueryString，这对我很有效：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2759199|Response.Redirect(Request.RawUrl.Replace(Request.Url.Query,+""));|code-block|syntax|javascript|2759200|我正在清理一个表单，其中有一些字段是由QueryString自动填充的，因此想要解决整个问题。|2759201|然而，如果你的目标是一个特定的参数，并想留下剩下的参数，其他人的答案可能会更好。|2759202|entityMap^0|8|B|0|0|J|B|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|M|3|N|5|6|7|X|8|@]|D|@]|E|$]]|$1|O|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|P|$]]

If you want to clear the entire <code>QueryString</code>, this worked for me:

<pre><code>Response.Redirect(Request.RawUrl.Replace(Request.Url.Query, ""));
</code></pre>

I was clearing a form which had some fields auto-populated by the <code>QueryString</code>, thus wanting to whack the whole thing.

However, the other guys' answers are probably better if you are targeting a specific parameter and want to leave the rest.

I have a <code>QueryString</code> named 'flagEdit' and I want to remove it after fetching it's value.
But when i try to remove it using

<pre><code>Request.QueryString.Clear();
</code></pre>

or

<pre><code>Request.QueryString.Remove("editFlag");
</code></pre>

This error occurs - 

<blockquote>
 System.NotSupportedException: Collection is read-only.
</blockquote>

So, I want to know how to remove query string after fetches it's value

Clear or Remove query string in ASP.Net

我有一个名为'flagEdit‘的QueryString，我想在获取它的值后将其删除。但是当我尝试删除它时，使用Request.QueryString.Clear();或Request.QueryString.Remove("editFlag");出现此错误- System.NotSupportedException:...

问清除或删除ASP.Net中的查询字符串
EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问清除或删除ASP.Net中的查询字符串EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问清除或删除ASP.Net中的查询字符串
EN