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.
Assembly: System.Web (in System.Web.dll)
Public Sub AddCacheDependency ( _
ParamArray dependencies As CacheDependency() _
)public void AddCacheDependency(
params CacheDependency[] dependencies
)public:
void AddCacheDependency(
... array<CacheDependency^>^ dependencies
)member AddCacheDependency :
dependencies:CacheDependency[] -> unit
Parameters
- dependencies
- Type:
array< System.Web.Caching. . :: . CacheDependency> [] () []
A file, cache key, or CacheDependency to add to the list of application dependencies.
| Exception | Condition |
|---|---|
| ArgumentNullException | The dependencies parameter is |
| InvalidOperationException | This method was called too late in the cache processing pipeline, after the cached response was already created. |
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="VB" %>
<%@ 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">
Sub Page_Load()
' Create a Cache Dependency
' using a CacheDependency object.
Dim authorsDependency("authors.xml") As CacheDependency
' 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()
End Sub
</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>
<%@ 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 SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.