Split QueryString? 2

[whatsthehampton]

Hi all,

How can I take a query string such as:-

?Folder=Folder1/Folder2/Folder3

and split it into

?Folder=Folder1/Folder2

Just taking off the last part of the querystring?

Thanks in advance,

j

http://www.bst.ac.jp

 

[ca8msm]

There are several methods including:

1) Use the Split method of a String
2) Use the Substring method of a String

Have a go at one of those and post back if you get any problems


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[vbkris]

hi,

this is one way of doing this:


Dim theFolder() As String = Request.QueryString("folder").Split("/")
theFolder(theFolder.Length - 1) = ""
Response.Write("folder=" & String.Join("/", theFolder))


But i need to know why you are doing this? you want to extract some values from a query string and pass them back as querystring to some other page???

Known is handfull, Unknown is worldfull

 

[whatsthehampton]

Thanks ca8msm and vbkris,

I am Googling substrings as we speak and I've almost got vbkris' going with

Dim qsx As String = SplitQueryString(Request.QueryString("folder"))
Protected Function SplitQueryString(ByVal qs As String) As String
Dim theFolder() As String = qs.Split("/")
theFolder(theFolder.Length - 1) = ""
Return (String.Join("/", theFolder))
End Function

But it is leaving the trailing '/' which is causing me problems?

What I am trying to do is navigate forwards and backwards through a members own online folder system.

Cheers,

Jon

http://www.bst.ac.jp

 

[vbkris]

try this:

If (Request.QueryString("folder").IndexOf("/") > 0) Then
Dim theFolder() As String = Request.QueryString("folder").Split("/")
theFolder(theFolder.Length - 1) = ""
Dim theResultString As String = String.Join("/", theFolder)
Response.Write(theResultString.Substring(0, theResultString.Length - 1))
End If

you will need to use substrings...

Known is handfull, Unknown is worldfull

 

[whatsthehampton]

Thank you vbkris,

Works like a charm and I learnt a lot on the way!

Cheers,

J

http://www.bst.ac.jp

 

[ca8msm]

An easier method would be just using the second item I suggested e.g.

        Dim s As String = Request.QueryString("folder")
        Dim t As String = s.Substring(0, s.LastIndexOf("/"))

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[whatsthehampton]

Thanks ca8msm!

A star for you too.

That works but sometimes I get

"
Length cannot be less than zero.
Parameter name: length
"

Because; I am using Forms Auth to define the root folder so no else can get to it.
Therefore my first URL is just

http://Localhost/Project/default.aspx

which maps to the logged in users' folder (Which is His/Her unique username)

From there I need to go back and forward.

With vbkris' code I have to check the Parent directory of the last QueryString request against the users Root folder.

Hmm..
Am I doing this all wrong?

Cheers,
j

http://www.bst.ac.jp

 

[onpnt]

when doing SubStrings...and most other string methods to manipulate your values you should always validate you are going to return a value prior to performing them and or what you are attempting to perform on them is valid.

examples shown were examples but you still need to use some programming methods to keep your code safe


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[ca8msm]

The example I gave will simply return a string up until the last occurance of a forward slash. Is that not what you want to do?


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