February 2002
Intermediate to advanced
960 pages
25h 37m
English
Content preview from Programming ASP .NETBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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The HttpCachePolicy Class
Just
as the OutputCache
page directive provides a high-level API for implementing caching, a
low-level API is available through the HttpCachePolicy class. This
class is contained within the System.Web namespace. It uses HTTP
headers to control the caching. The HttpCachePolicy class mirrors the
functionality provided by the page directive. It also provides
additional low-level control, comparable to the type of control
provided for object caching.
To use the HttpCachePolicy class to control output caching, do not
include an OutputCache directive in the page file.
Instead, use the Response.Cache syntax, as shown in the highlighted
lines in Example 18-21 (for VB.NET) or Example 18-22 (for C#). (Example 18-22
includes only the script block, since the HTML is identical to that
in Example 18-21. Note that these
examples are
similar to Example 18-3 and Example 18-4.)
Example 18-21. Output caching using HttpCachePolicy Class in VB.NET, vbOutputCache-03.aspx
<%@ Page Language="VB" %>
<script runat="server">
sub Page_Load(ByVal Sender as Object, _
ByVal e as EventArgs)
Response.Cache.SetExpires(DateTime.Now.AddSeconds(10))
Response.Cache.SetCacheability(HttpCacheability.Public) lblMsg.Text = "This page was loaded at " & _ DateTime.Now.ToString("T") lblUserName.Text = Request.Params("username") lblState.Text = Request.Params("state") end sub </script> <html> <body> <form runat="server"> <h1>Output Caching</h1> <asp:Label id="lblMsg" runat="server"/> <br/> <br/> UserName: ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.