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HttpResponse.AddCacheItemDependencies Method (ArrayList)

Makes the validity of a cached response dependent on other items in the cache.

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

public void AddCacheItemDependencies(
	ArrayList cacheKeys
)

Parameters

cacheKeys
Type: System.Collections.ArrayList

The ArrayList that contains the keys of the items that the current cached response is dependent upon.

When the items referred to in the cacheKeys parameter are removed from the cache, the cached response of the current item is not valid.

The following example demonstrates how to use an ASP.NET page that is output cached. The code for the page creates an ArrayList object of keys that are associated with items that are stored in the Cache object. Next, the code passes the ArrayList as the parameter in a call to the AddCacheItemDependencies method. This makes the output cached response not valid, if any of the files specified in the ArrayList change.

<%@ Page Language="C#" %>
<%@ outputcache duration="30" varybyparam="none" %>
<%@ Import namespace="Samples.AspNet.CS" %>

<!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 an array list that 
        // contains the keys for two 
        // items stored in the Cache object.
        ArrayList deps = new ArrayList();
        deps.Add("bookData");
        deps.Add("authorData");

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

        // Populate the DataGrids.
        dgAuthors.DataSource = DataHelper.GetAuthorData();
        dgAuthors.DataBind();

        dgBooks.DataSource = DataHelper.GetBookData();
        dgBooks.DataBind();

        lblOutputCacheMsg.Text = DateTime.Now.ToString();

    }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
    <title>Cache Item Dependencies</title> 
</head>
<body>
    <form id="Form1" method="post" runat="server">
        <table>
            <tbody>
                <tr>
                    <th style="WIDTH: 118px">
                        Authors</th>
                    <td>
                        <asp:DataGrid id="dgAuthors" runat="server"></asp:DataGrid>
                    </td>
                </tr>
                <tr>
                    <th style="WIDTH: 118px">
                        Books</th>
                    <td>
                        <asp:DataGrid id="dgBooks" runat="server"></asp:DataGrid>
                    </td>
                </tr>
                <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, 1.1, 1.0
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