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4GuysFromRolla.com : ASP FAQS : Session Object


How can I list all of the existing Session variables for a particular user?

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Answer: For debugging purposes, there are times when it would be nice to be able to visit a Web page and have a listing of all of the session variables and their values. Fortunately this task is relatively simple since the Session object exposes the Contents collection as one of its properties. We can use a For Each ... Next loop to then step through each element of the Contents collection.

Dim strName, iLoop
'Use a For Each ... Next to loop through the entire collection
For Each strName in Session.Contents
  Response.Write strName & " - " & Session.Contents(strName) & "<BR>"

Pretty straightforward, no? The above code will work flawlessly except when the user has assigned an array to a session variable. Therefore, we need to add an If statement in our For Each ... Next loop to determine whether or not the current session variable is an array. If it is, then we need to step through and display each element of the array.

Here is the revised code that will now gracefully handle/display session-level arrays:

'How many session variables are there?
Response.Write "There are " & Session.Contents.Count & _
              " Session variables<P>"

Dim strName, iLoop
'Use a For Each ... Next to loop through the entire collection
For Each strName in Session.Contents
  'Is this session variable an array?
  If IsArray(Session(strName)) then
    'If it is an array, loop through each element one at a time
    For iLoop = LBound(Session(strName)) to UBound(Session(strName))
      Response.Write strName & "(" & iLoop & ") - " & _
                      Session(strName)(iLoop) & "<BR>"
    'We aren't dealing with an array, so just display the variable
    Response.Write strName & " - " & Session.Contents(strName) & "<BR>"
  End If

And there you have it! A simple loop that will display all session variables, regardless if they are an array or not! For information on listing application-level variables, be sure to read the FAQ: How can I list all of the Application variables on a Web page?

Happy Programming!

(You can snake the raw code for the above loop at:

FAQ posted by Scott Mitchell at 12/5/2000 3:54:05 PM to the Session Object category. This FAQ has been viewed 70,443 times.

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