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Removing (Deleting) Querystring in ASP.NET

, 7 Apr 2011 CPOL 45.7K 10
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Removing (Deleting) Querystring in ASP.NET

We cannot delete a query string directly like below:

Request.QueryString.Remove("foo")

If you do this, you will get an error - collection is read-only. So, we need to write the below code before deleting the query string.

In C#:

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");

In VB.NET:

Dim isreadonly As PropertyInfo = _
  GetType(System.Collections.Specialized.NameValueCollection).GetProperty(_
  "IsReadOnly", BindingFlags.Instance Or BindingFlags.NonPublic)
 
' make collection editable
isreadonly.SetValue(Me.Request.QueryString, False, Nothing)
 
' remove
Me.Request.QueryString.Remove("foo")
I hope that this will help you guys.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Toniyo Jackson
Software Developer
India India
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Comments and Discussions

 
GeneralRe: > OP was talking about a single request Ah, that's what's h... Pin
Jeff Bowman12-Apr-11 7:46
memberJeff Bowman12-Apr-11 7:46 
> OP was talking about a single request

Ah, that's what's happened. We're talking about two different things Smile | :)

I read the thread too quickly. Based on Venkatesh's reply, I misunderstood this topic to address the problem of how to detect a page refresh and not initiate a duplicate action.

So now your technique makes sense Smile | :)


_____
p.s. Even though the unanimous vote is that the collection should stay read-only, I think OP was pretty clever to dig in and come up with that approach. Albeit misguided, it shows initiative Wink | ;-)

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