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Output caching and file based expiration
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This message was discovered on ASPFriends.com 'aspngcache' list.


jwiesen@longandfoster.com
I have a page that is using fragment caching via a user control. Everything
is working fine. I would like however, to expire the fragment from cache
based on an XML file sitting on the local drive. I want the fragment to stay
in cache as long as this file remains unchanged. As soon as the XML file is
updated, I was the fragment to expire, and be recreated. The only thing I
can seem to find is setting an explicit duration for the expiration. Is it
even possible to do what I'm asking? If it is, can someone point me in the
direction of an example? I can't seem to find anything. Thanks in advance
for any help.

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Jim Wiesen
Web Applications Developer
Long & Foster Real Estate
Click here to reveal e-mail address <mailto:Click here to reveal e-mail address>
http://www.longandfoster.com
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G. Andrew Duthie
The following is code that I've tested to expire a cached user
control based on changes to the control's .ascx file:

<%@ Control Language="vb" %>
<%@ OutputCache VaryByControl="none" Duration="1200" %>
<script runat="server">
Sub Load(Sender As Object, e As EventArgs) Handles
MyBase.Load
Message.Text = DateTime.Now.ToString

Page.Response.AddFileDependency(Server.MapPath("Nav.ascx"))
End Sub
</script>
<asp:label id="Message" runat="server">Test</asp:label>

To adapt this to your situation, you'd need only change the file
name:

<script runat="server">
Sub Load(Sender As Object, e As EventArgs) Handles
MyBase.Load
Message.Text = DateTime.Now.ToString

Page.Response.AddFileDependency(Server.MapPath("MyFile.xml"))
End Sub
</script>

Should work fine. If you want the cache to be dependent on more
than one file, there's also an AddFileDependencies method as
well.

hth,

--
G. Andrew Duthie
Graymad Enterprises, Inc.
http://www.graymad.com
Click here to reveal e-mail address
Author, Microsoft ASP.NET Step By Step
http://www.amazon.com/exec/obidos/ASIN/0735612870/

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