Sunday, November 18, 2007

ASP.NET 2.0 Caching (2) Substitution Control

Up to now ASP.NET provided three kinds of caching
1. output-caching to cache a whole page
2. fragment caching to cache a part of a page
3. Data caching

The last post we talked about output caching. In this post, we will talk about one of the application on fragment caching: the Substitution Control.

<%@ Page Language="VB" %>

<%@ OutputCache Duration="60" VaryByParam="none" %>

<script runat="server">

Shared Function GetCurrentDate(ByVal context As HttpContext) As String

Return Now.ToString()

End Function



<head id="Head1" runat="server">

<title>Post Cache Substitution</title>



<form id="form1" runat="server">


This page uses post cache substitution to insert a dynamic value into a cached page.</h4>



<%= DateTime.Now.ToString() %>



<b>Real Time:

<asp:Substitution ID="Substitution1" runat="server" MethodName="GetCurrentDate" />






Cached regions execute only once and are replayed from the cache until the cache expires. Dynamic regions (Substitution control places) execute each time the page is requested.
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