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ASP.NET Hosting - ASPHostPortal :: Output Caching and Authenticated Users

clock May 28, 2012 09:04 by author Jervis

Output caching means that your code runs once to provide the output, then doesn’t run again until the caching period has expired. In my example, that meant it would run four times for my different circumstances, but not again for each individual circumstance until the timeout had expired. But it turns out that isn’t sufficient to my needs. If the user is logged in, the code needs to run every time.

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So how do we stop the site from using output caching with authenticated users?


One quick and (very) dirty approach would be to use the GetVaryByCustomString() method to assign a unique value (a timestamp or a GUID) as the cache key for authenticated users. That would ensure the code runs every time, but would also lead to a plethora of unwanted pages in the cache.


Fortunately, there is a much better solution. The Output Cache exposes a callback that allows you to decide whether to return the cached item, or run the code. We can use this callback to determine if the user is authenticated–and if they are, invalidate the cache for this response.


The first thing we need to do is create our own derived version of the Output Cache. That’s straightforward–just inherit from OutputCacheAttribute like so:

Then we need to override the OnActionExecuting() method to set up the callback where we will invalidate the cache:



Now all we need to do is implement our
OnlyIfAnonymous() method and tell it not to cache if this is an authenticated user. The signature of AddValidationCallback gives us access to the HttpContext, an optional data object (which we don’t need) and the HttpValidationStatus–which is passed in by reference and allows us to ignore the cache for this request. Here is the completed method:



The one remaining step is to replace the
OutputCache directive on our controller method with a reference to our new OnlyUnAuthenticated attribute.



Now we have a solution that caches appropriately for anonymous users, but ensures that the code runs every time for authenticated users.


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ASP.NET Ajax Hosting - ASPHostPortal :: How to Solve - Could not load file or assembly 'Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'

clock April 26, 2012 10:53 by author Jervis

When deploy a ASP.NET application to a new server, error message below shown:

Could not load file or assembly 'Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.



This is the steps to solve this problem:


1. Copy
AjaxControlToolkit.dll and AjaxControlToolkit.pdb version 1.0.61025.0 from my development machine to my ASP.NET App bin folder. (i install my AjaxControlToolkit in C:\Program Files\Microsoft ASP.NET\ASP.NET 2.0 AJAX Extensions\AjaxControlToolkit)

2. Copy
System.Web.Extensions.dll (C:\WINDOWS\assembly\GAC_MSIL\System.Web.Extensions) and System.Web.Extensions.Design.dll (C:\WINDOWS\assembly\GAC_MSIL\System.Web.Extensions.Design) from my development machine to my ASP.NET App bin folder.

3. Run the application and it’s works.


Alternatively, we can solve the problem by installing AJAX.NET and AjaxControlToolkit to the server. Hope it helps



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