HttpCapabilitiesBase.SupportsCacheControlMetaTag Property

Gets a value indicating whether the browser supports the cache-control value for the http-equiv attribute of HTML <meta> elements.

Namespace: System.Web.Configuration
Assembly: System.Web (in system.web.dll)

public virtual bool SupportsCacheControlMetaTag { get; }
/** @property */
public boolean get_SupportsCacheControlMetaTag ()

public function get SupportsCacheControlMetaTag () : boolean

Not applicable.

Property Value

true if the browser supports the cache-control value for the http-equiv attribute of HTML <meta> elements; otherwise, false. The default is true.

The cache-control value for the http-equiv attribute of HTML <meta> elements allows control over client caching of downloaded content, which includes Web pages. The following HTML fragment shows an example:

<META HTTP-EQUIV="CACHE-CONTROL" CONTENT="NO-CACHE"/>

If true, the inclusion of this tag in the <head> element of a Web page should force the browser to reload content from the server.

If false, server control adapters append a default query string (__ufps=uniquefilepathsuffix) onto link URL values that do not already have one. This forces the browser to reload content from the server.

The SupportsCacheControlMetaTag property also applies to the equivalent HTTP header form:

CACHE-CONTROL: NO-CACHE

The following code example shows how to determine whether the browser supports the cache-control value for the http-equiv attribute of HTML <meta> elements.

<%@ page language="C#"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
    void Page_Load(Object Sender, EventArgs e)
    {
        CheckBrowserCaps();
    }

    void CheckBrowserCaps()
    {
        String labelText = "";
        System.Web.HttpBrowserCapabilities myBrowserCaps = Request.Browser;
        if (((System.Web.Configuration.HttpCapabilitiesBase)myBrowserCaps).SupportsCacheControlMetaTag)
        {
            labelText = "Browser supports the CACHE-CONTROL value for the HTTP-EQUIV attribute of HTML META elements.";
        }
        else
        {
            labelText = "Browser does not support the CACHE-CONTROL value for the HTTP-EQUIV attribute of HTML META elements.";
        }

        Label1.Text = labelText;
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
    <title>Browser Capabilities Sample</title>
</head>
<body>
    <form runat="server" id="form1">
        <div>
            Browser Capabilities:
            <p/><asp:Label ID="Label1" Runat="server" />
        </div>
    </form>
</body>
</html>

<%@ page language="VJ#"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">    

void Page_Load(Object sender, EventArgs e) 
{
    CheckBrowserCaps();
} //Page_Load

void CheckBrowserCaps()
{
    String labelText = "";
    System.Web.HttpBrowserCapabilities myBrowserCaps = 
        get_Request().get_Browser();
    if (((System.Web.Configuration.HttpCapabilitiesBase)myBrowserCaps).
        get_SupportsCacheControlMetaTag()) {
        labelText = "Browser supports the CACHE-CONTROL value for the"
            +" HTTP-EQUIV attribute of HTML META elements.";
    }
    else {
        labelText = "Browser does not support the CACHE-CONTROL value for the"
            +" HTTP-EQUIV attribute of HTML META elements.";
    }
    Label1.set_Text(labelText);
} //CheckBrowserCaps
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
    <title>Browser Capabilities Sample</title>
</head>
<body>
    <form runat="server" id="form1">
        <div>
            Browser Capabilities:
            <p/><asp:Label ID="Label1" Runat="server" />
        </div>
    </form>
</body>
</html>

Windows 98, Windows Server 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0

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