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.NET Forum / ASP.NET / Caching / February 2005User Control, @OutputCache, and varying the cache by property value
Question: If I have an ASP.NET User Control which defines/exposes a property that the page can use to specify a mode or data subset for the control to use, is there a way to tell the @OutputCache directive to vary its cache based on that property value? I.e., I have: <my:control runat="server" id="mcOne" Flag="One" /> <my:control runat="server" id="mcTwo" Flag="Two" /> where Flag is a public property of the code-behind class (whose value affects the display output), and I want the Flag="One" instance to output-cache separately from the Flag="Two" instance. So far, the control seems to output-cache only one version of the control, and all successive displays of the control use that cached version, regardless of the Flag attribute value. Other notes: The @OutputCache directive's VaryByParam attribute works only with GET and POST values. (I did try VaryByParam="Flag" anyway, to no effect.) Setting the @OutputCache directive's Shared attribute to "False" solves the problem (by causing each usage of the control to cache separately), but has the additional effect of requiring separate initial-loads and caches for each page on which the control appears. Since I currently only have two or three possible values of the Flag attribute, but these controls may appear on many pages (and there is some work invovled in the initial load of the data for this control), this is not ideal. There doesn't seem to be any sort of VaryByProperty attribute for @OutputCache (which surprises me). So... Any other ideas? - Tom Kiefer thogek @ earthlink . net Have you looked at VaryByCustom?  Signaturevenlig hilsen / with regards anders borum -- Yes, but I'm unclear on how that construct would be able to access anything specific to the control being cached. From http://msdn.microsoft.com/library/en-us/cpgenref/html/cpconOutputCache.asp and http://msdn.microsoft.com/library/en-us/cpref/html/frlrfSystemWebHttpApplication ClassGetVaryByCustomStringTopic.asp, I see VaryByCustom allowing me to specify arbitrary rules that can act on the HttpContext of the current request, but not on details within the control itself (such as the value of a given property). Unless I'm missing something.... - Tom Kiefer thogek @ earthlink . net > Have you looked at VaryByCustom? I'm guessing from the lack of response that there's no ready way to do what I'm looking for. :-( If anyone from Microsoft is reading this, is there any indication that any future versions of ASP.NET might support what I attempt to describe below? - Tom Kiefer thogek @ earthlink . net > Question: > If I have an ASP.NET User Control which defines/exposes a property that the [quoted text clipped - 35 lines] > - Tom Kiefer > thogek @ earthlink . net Just a guess-- Have you looked at VaryByControl? http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/html/cp concachingmultipleversionsofusercontrolbasedonparameters.asp Thanks, Eric Lawrence Program Manager Assistance and Worldwide Services This posting is provided "AS IS" with no warranties, and confers no rights. > I'm guessing from the lack of response that there's no ready way to do what > I'm looking for. :-( [quoted text clipped - 48 lines] > > - Tom Kiefer > > thogek @ earthlink . net According to http://msdn.microsoft.com/library/en-us/cpgenref/html/cpconOutputCache.asp and http://msdn.microsoft.com/library/en-us/cpguide/html/cpconcachingmultipleversion sofusercontrolbasedonparameters.asp, this sounds like VaryByControl directs the control to tie its caching conditions (in a way that is unclear to me) to those of child control whose ID matches the value of the VaryByControl attribute -- not quite what I'm looking for. (I suppose that, with some work, I might be able to kludge this into what I want, but...) I'm looking for a way to direct the control to cache itself separately for each value of an arbitrary specified property of that control. Sort of a VaryByProperty="Flag" which would cause the control to be cached separately for each value of the control's Flag property, as specified in the control's HTML declaration (i.e., separately for Flag="One", Flag="Two", etc.). I'm rather suprised that a VaryByProperty attribute of the @OutputCache directive does not already exist (whether by that name or some other). Again, unless I'm completely misunderstanding.... - Tom Kiefer thogek @ earthlink . net > Just a guess-- Have you looked at VaryByControl? http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/html/cp concachingmultipleversionsofusercontrolbasedonparameters.asp > Thanks, > [quoted text clipped - 62 lines] > > > - Tom Kiefer > > > thogek @ earthlink . net I believe VaryByControl is what you're looking for. VayByControl should accept the name of a property of that control and you'll get different cache variations depending on the value set in the prop. SignatureCorey O'Mara MCSD.NET, MCT > According to > http://msdn.microsoft.com/library/en-us/cpgenref/html/cpconOutputCache.asp > and http://msdn.microsoft.com/library/en-us/cpguide/html/cpconcachingmultipleversion sofusercontrolbasedonparameters.asp, > this sounds like VaryByControl directs the control to tie its caching > conditions (in a way that is unclear to me) to those of child control whose [quoted text clipped - 17 lines] > > > Just a guess-- Have you looked at VaryByControl? http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/html/cp concachingmultipleversionsofusercontrolbasedonparameters.asp > > Thanks, > > [quoted text clipped - 71 lines] > > > > - Tom Kiefer > > > > thogek @ earthlink . net did you have find any solution for this problem, i have exactly the same and i don't know how to solve it thanks a lot Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. 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