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Generating uniquie ID's for files that are produced by my Web APP?

Posted on 2008-10-16
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Last Modified: 2013-12-17
HI I am developing a web app in C# / ASP.net with a SQL2005 database. I need to generate uniquie file id's & file names for files that are created, but don't want people to be able to guess a new file ID as they may see others data. What would be the best way to implement this type of thing?

Cheers

Baz
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Question by:ipgbarry
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CuteBug earned 1000 total points
ID: 22737407
Use System.Guid to get unique IDs

System.Guid guid=System.Guid.NewGuid();
string filename = guid.ToString();
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Expert Comment

by:JDEE8297
ID: 22737466
sounds like a good solution, but I had a similar situation and end users didn't understand what they meant unless you had some kind of a legend to go with it.

What I did in my system was the date time and id in the record in my database, the file itself was stored on the server, but I create a link to it so that when someone clicked on the link it would download the file with a meaningful name.

example

yyyymmdd_hhmmss_recordid_filenamewithoutextensioninit.ext where .ext corresponded to the to actual filetype of the file being downloaded.
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by:CuteBug
ID: 22737576
Thats a good solution too JDEE8297, but ipqbarry has this requirement
"don't want people to be able to guess a new file ID as they may see others data."

In such a case GUID can be useful.
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Expert Comment

by:JDEE8297
ID: 22739419
true, but in my case the only people who have access to the files is the internal art people, the customer themselves don't have access to these file and if we ever did give them access to it. They still wouldn't be able to access them, because the actual name of the file that I send back to the user when the link is clicked, is not the actual name of the file on the server. Still the solution with the guid was a good one. :)
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