Using the Api on a medium trust server

The photo sharing site Flickr has a nice api which you can use in your own applications. On codeplex is a .net version of this api

I had to make a little script for a friends project so she could view random flickr photo’s on her site. I made a aspx page using the Flickr.Net dll and it worked perfectly on my own machine. after uploading it to my hosted webserver i ran into trouble. the following error came up when browsing to the aspx page

Exception Details: System.Security.SecurityException: Request for the permission of type ‘System.Security.Permissions.FileIOPermission, mscorlib, Version=, Culture=neutral, PublicKeyToken=b77a5c561934e089′ failed.

After some research i came to the conclusion that it had something to do with my site running in a medium trust. The Flickr.Net api uses a caching function standard which doesnt has the right permission on a hosted envoirment.

The real solution was easy after i found out what the real problem was. The only thing i had to do was disable the caching:

Flickr.CacheDisabled = true;


After doing this the script was running perfectly. during the search for the solution to this problem i came across a lot of people who had the same problem when deploying their enabled scripts so i thought it was handy to post this simple solution.

Have fun with your Flickr.Net enabled Scripts!

Geert van der Cruijsen

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