Output Caching

[Susana]

hello to all,

 

can anyone help me? I want to cache my pages based on VeryByParam=userid. The value for userid comes from a Session.

 

The problem is almost all the pages in the application should be cached by userid and i don't want to recode all of them just to pass parameters like

Response.Redirect("../Menu.aspx?userid=" & Session("userid")).

 

Is there anyway that i could add immediately the value to the directive? example,

 

<%@ OutputCache Duration="2700" VaryByParam="Session('userid')" %>

 

but i already tried this one and it won't work.

 

or how do i use the value coming from a hidden field. I also tried this one:

<%@ OutputCache Duration="2700" VaryByParam="userid" %>

...

...

..

..

<FORM>....

<input id=userid type=hidden value=<%=Session("userid")%>

</FORM>

 

but even if a different user already log, same page as the first user would be displayed.

 

Sorry if my explanation is not clear enough but i hope atleast you understand what I meant...

 

hope to hear from you... anyone :confused:

thanks.

[Robby]

I'm not sure if I understand, do you want to cache menu items for each userID?

[Derek Stone]

You need to override the HttpApplication.GetVaryByCustomString() method.

 

public override string GetVaryByCustomString(HttpContext context, string custom)
{
   if (custom == "userid")
   {
       return HttpContext.Current.Session.Item["userid"].ToString();
   }
}

 

Place this in the global.asax file (inside script tags of course).

[Susana]

Hi Robby, sorry if i replied quite late already... thanks for your time... what i want is i want to cache the menu page for each userid... the menu items displayed on the menu page vary depending on the user's access..

 

I'm not sure if I understand' date=' do you want to cache menu items for each userID?[/quote']

[Susana]

hello Derek Stone,

 

sorry for making you wait... and thank you for your reply... your suggestion is correct, based on other articles I read. But I can't make it work on my application... I might be missing something...

 

here is what I am doing:

 

in HTML of the aspx file I placed:

<%@ OutputCache Duration="2700" VaryByParam="none" VaryByCustom="uid" %>

 

and in global.asax.vb I placed these:

Public Overrides Function GetVaryByCustomString(ByVal context As HttpContext, ByVal arg As String) As String

If (arg = "uid") Then

Return HttpContext.Current.Session.Item("userid").ToString()

End If

End Function

 

 

but whenever I logged in twice with different users, same menu page is displayed. The cached page of the first user. help me further please...

 

thank you so much...