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HttpResponse.AddCacheDependency Method

Associates a set of cache dependencies with the response to facilitate invalidation of the response if it is stored in the output cache and the specified dependencies change.

Namespace:  System.Web
Assembly:  System.Web (in System.Web.dll)

public void AddCacheDependency(
	params CacheDependency[] dependencies
)

Parameters

dependencies
Type: System.Web.Caching.CacheDependency[]

A file, cache key, or CacheDependency to add to the list of application dependencies.

The AddCacheDependency method allows dependencies to be created between cached responses and a CacheDependency object.

The following example demonstrates how to create a cache dependency by using the AddCacheDependency method and a CacheDependency object.

<%@ Page Language="C#" %>
<%@ outputcache duration="30" varybyparam="none" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="Server">
    private void Page_Load(object sender, System.EventArgs e)
    {
        // Create a Cache Dependency  
        // using a CacheDependency object.
        CacheDependency authorsDependency = new CacheDependency("authors.xml");


        // Make the page invalid if either of the 
        // cached items change or expire.        
        Response.AddCacheDependency(authorsDependency);

        // Display the current time for cache reference
        lblOutputCacheMsg.Text = DateTime.Now.ToString();
    }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
    <title>Cache Dependencies</title> 
</head>
<body>
    <form id="Form1" method="post" runat="server">
        <table>
            <tbody>
                <tr>
                    <td style="WIDTH: 118px">
                        The page was generated at:</td>
                    <td>
                        <asp:Label id="lblOutputCacheMsg" runat="server"></asp:Label>
                    </td>
                </tr>
            </tbody>
        </table>
    </form>
</body>
</html>

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0

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