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Fragment caching a custom control

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This message was discovered on ASPFriends.com 'aspngcache' list.

Joakim Sunden

-- Moved from [aspngwebcontrols] to [aspngcache] by Let the good times roll <Click here to reveal e-mail address> --

Hi.
Can someone tell me how to use fragment caching with a custom control?
With a user control it is easy, I just add the OutputCache directive to
the top of the page, but this cannot be done with a custom control.

/joakim sundén

Reply to this message...

John Crim

You can have the custom control store its output in the cache. To
grab the output, use a new HtmlTextWriter instead of the one passed into
Render.

String key; // Computed to uniquely identify the cached output for the
control

// Disclaimer: Code written without testing, probably doesn't work but
is close
protected string BuildCacheOutput()
    {
    System.IO.StringWriter stringWriter =3D new
System.IO.StringWriter();
    HtmlTextWriter newHtmlWriter =3D new HTMLTextWriter(stringWriter);

    // Do rendering
    // For this example, just call the base class Render
    base.Render(newHtmlWriter);

    // After rendering everything to the newHtmlWriter, grab the
output
    string output =3D stringWriter.ToString();

    // Add it to the cache
    DateTime tExpire =3D {compute time you want it to expire};
    HttpContext.Cache.Add(key, output, null, tExpire, 0, 0, null);

    return output;
    }

During normal rendering of your control, spit out the cached output
instead of reconstructing the output.

protected override void Render(HtmlTextWriter output)
    {
    object cachedOutput =3D HttpContext.Cache[key];
    if (cachedOutput !=3D null)
        writer.Write((string)cachedOutput);
    else
        {
        // Build cached output, cache it
        string output =3D BuildCacheOutput();

        // Then write it
        writer.Write(output);
        }
    }

Hope that helps.

John Crim
WebGecko Software
http://www.webgecko.com

-----Original Message-----
From: Joakim Sunden [mailto:Click here to reveal e-mail address]=20
Sent: Thursday, August 08, 2002 4:54 AM
To: aspngcache
Subject: [aspngcache] Fragment caching a custom control

-- Moved from [aspngwebcontrols] to [aspngcache] by Let the good times
roll <Click here to reveal e-mail address> --

Hi.
Can someone tell me how to use fragment caching with a custom control?
With a user control it is easy, I just add the OutputCache directive to
the top of the page, but this cannot be done with a custom control.

/joakim sund=E9n
| [aspngcache] member Click here to reveal e-mail address =3D YOUR ID=20
| http://www.aspfriends.com/aspfriends/aspngcache.asp =3D JOIN/QUIT

-

-

Reply to this message...

Joakim Sunden

Thank you, but it is not exactly what I am looking for. I want to be
able to use the CacheOutput directive and its properties, such as the
VaryByParam and VaryByCustom. Can this be done?

/joakim sund=E9n

[Original message clipped]

Reply to this message...

ToddC@match.com

Sure, he is doing it manually, which is what Custom Controls are about.

To use the CacheOuput (which is probably doing the same thing his code =
is
doing ;) you must be using full pages, or User Controls.

His code could be modified to mimic the VaryByParm and VaryByCustom
functionality.

tc

-----Original Message-----
From: Joakim Sunden [mailto:Click here to reveal e-mail address]=20
Sent: Friday, August 09, 2002 1:43 AM
To: aspngcache
Subject: [aspngcache] RE: Fragment caching a custom control

Thank you, but it is not exactly what I am looking for. I want to be
able to use the CacheOutput directive and its properties, such as the
VaryByParam and VaryByCustom. Can this be done?

/joakim sund=E9n

[Original message clipped]

| [aspngcache] member Click here to reveal e-mail address =3D YOUR ID
| http://www.aspfriends.com/aspfriends/aspngcache.asp =3D JOIN/QUIT

Reply to this message...

John Crim

No, not on custom controls. =20

There are no directives for custom controls, just code. For user
controls, directives are translated into code at ASCX parse-time.

Regards,
=20
John Crim
WebGecko Software
http://www.webgecko.com

-----Original Message-----
From: Joakim Sunden [mailto:Click here to reveal e-mail address]=20
Sent: Thursday, August 08, 2002 11:43 PM
To: aspngcache
Subject: [aspngcache] RE: Fragment caching a custom control

Thank you, but it is not exactly what I am looking for. I want to be
able to use the CacheOutput directive and its properties, such as the
VaryByParam and VaryByCustom. Can this be done?

/joakim sund=E9n

[Original message clipped]

-

Reply to this message...

	System.DateTime
	System.IO.StringWriter
	System.Web.HttpContext
	System.Web.UI.HtmlTextWriter

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