CODEWITHSUNDEEP
cachingiframe
barak ben horin
barak ben horin

Reputation: 534

eliminate cache in iframes

I have a financial system where I create pdf forms for tax forms, receipts and etc I have a printing page where I open the document for the client in an iframe which suits dynamically the src to the client's pdf - 

curUser = usrSrv.getUserFromCookie(cookie);
string formSrc = "UserForms/" + curUser.Id + ".pdf";
ifPdf.Attributes.Add("src", formSrc);

iI my code behind I've inserted the clear cache properties as such:

Response.Cache.SetCacheability(HttpCacheability.NoCache);
Response.Cache.SetNoStore();

but still - in several cases (when the user goes back from the print page for ex') - the pdf file is being saved in the cache and the system is losing its purpose.

I've figured out there might be a way with - server.Mappath() - but when I use it - the location seems fine and the file exists but the browser never finds the actual file or simply don't show it.

Upvotes: 0

Views: 551

Answers (1)

Igor Francé
Igor Francé

Reputation: 328

If you add a querystring parameter to the end of the frame's URL you will get the result you need, as long as the parameter is generated fresh and unique every time. A common way of doing that is to add something like a timestamp:

url += "?ts=" + DateTime.Ticks;

or:

url += "?ts=" + Date.getTime();

Upvotes: 1

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