By Richard P.
To Delete a Specific Session Variable... |
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This tip demonstrates how to remove a set of Session variables that begin with a
particular substring. If you want to learn how to delete a specific Session variable
be sure to read the FAQ: "How can
I kill one session variable at a time? I don't want to have to abandon the whole
session, just kill off a few session variables that were used?" If you want to
remove all of the Session variables, use
Session.Contents.RemoveAll() .
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When using Sessions to store variables in, I use a naming convention -
for example, for all Customer related info I prefix the session variable with
the substring Customer.
(so
for the CustomerID
it would be Customer.ID
, the customer
username would be Customer.Name
, etc.)
This is very useful when viewing the session objects as you can see the
related objects straight off.
The problem I had the other day was that I wanted to remove only those
items from the Session which were prefixed SW.
. So first off I used
the following code:
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This seems fine, but when it's run, what happens is that SW.1
is
removed, but SW.2
is NOT removed. Why? I'm not exactly sure,
but I guess that the index is then
reset so that SW.2
is now where SW.1
was, and seeing
as we have iterated past that item in the For Each...Next
statement,
the loop just moves to Other
, missing out SW.2
altogether!
Eek!
So to get round this I wrote the following function, which will properly delete all Session variables that begin with a specified substring:
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This now saves me a lot of time. I hope this can be of use to someone else!
Happy Programming!
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