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HomeHomeArchived Discus...Archived Discus...Developing Under Previous Versions of .NETDeveloping Under Previous Versions of .NETASP.Net 2.0ASP.Net 2.0view state in Memory + Response.WriteFile causes problemview state in Memory + Response.WriteFile causes problem
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7/30/2009 10:51 AM
 
Vivek Athalye

Joined: 12/26/2008
Posts: 9

Hello,

I have an Export button in 1 module. On click of it a XLS file is supposed to get downloaded. This is handled by setting appropriate content-type & content-disposition headers and then using Response.WriteFile(). [Also tried Response.BinaryWrite().] This functionality works on alternate clicks. Meaning: when I click on Export for first time, it downloads the file. 2nd time, it just reloads the page, 3rd time it downloads the file, 4th time reload and so on.

This behaviour is seen when the Page State Persistence (in Host Settings > Performance Settings) is set to "Memory". If we change it to "Page" I don't face any problem, Export button behaves as desired.

Is there a way to make Export button work consistantly, even if Page State is saved to Memory.

I'm using DNN 4.9.0. I can possibly fix this problem if I do changes to CachePageStatePersister, but its not allowed by our client. So if there is some way that I can handle it through my module itself, please let me know.

Thanks & Regards,
- Vivek Athalye

 
 
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7/31/2009 7:19 AM
 
Vivek Athalye

Joined: 12/26/2008
Posts: 9

I'm able to export the file now. I've implemented it as: Created a separate page that has a single module. This module has no UI. On Page_Load, I'm directly exporting the file.

Here are my findings for this issue:

1. The root cause is the implementation of CachePageStatePersister in DNN Framework. In Load method it clears the PageState once its loaded from Cache. This causes the problem next time we hit the Export button. As we are not allowed to modify it, we had to use above mentioned workaround.

2. If we use Button or LinkButton for downloading the file it doesn't work. Even if we use Button or LinkButton for redirecting to the separate page that downloads the file, it causes other problems.  We need to have a simple HyperLink that points to the file downloader page.

HTH

Thanks & Regards,
- Vivek Athalye
 
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HomeHomeArchived Discus...Archived Discus...Developing Under Previous Versions of .NETDeveloping Under Previous Versions of .NETASP.Net 2.0ASP.Net 2.0view state in Memory + Response.WriteFile causes problemview state in Memory + Response.WriteFile causes problem


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