SystemIndex query is not retrieving instantly added files. Is it possible?

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I am querying SystemIndex catlog to show recently added files in my application. But sometimes, SystemIndex is not bring up the very recently added files for my search. Do we have any fix for this issue?

My Query is like below

SELECT "System.ItemName", "System.ItemFolderPathDisplay" FROM "SystemIndex" WHERE CONTAINS(*,'"searchterm"',1033) AND (System.FileName LIKE '%.doc' OR System.FileName LIKE '%.txt') AND Contains(System.Kind, 'document') ORDER BY System.FileName ASC

Posted 10-Mar-14 8:43am

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Sergey Alexandrovich Kryukov · Answer 1 · 2014-03-10T09:18:00

Unfortunately, WMI is neither efficient nor reliable when it comes to handling its events. As I figured out a while ago, such handling is based simply on regular polling, which is always bad. Please see:
http://en.wikipedia.org/wiki/Pull_technology[^],
http://en.wikipedia.org/wiki/Push_technology[^],
http://en.wikipedia.org/wiki/Polling_%28computer_science%29[^].

I mean, pull technology is always bad (when it comes to regular polling), push is good. In your case, at the moment when you query for files, they might not be currently polled, you have to wait for some indefinite time, when all files are finalized, closed, and then polled.

Alternatives? You could use System.IO.FileSystemWatcher:
http://msdn.microsoft.com/en-us/library/system.io.filesystemwatcher%28v=vs.110%29.aspx[^].

There is something you should be aware of though: the CodeProject member John Simmons / outlaw programmer reported these problems:
FileSystemWatcher - Pure Chaos (Part 1 of 2)[^],
FileSystemWatcher - Pure Chaos (Part 2 of 2)[^].

—SA