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POWhat is the fastest way to get lists of files and search through file lists repeatedly?
 

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  1. POWhat is the fastest way to get lists of files and search through file lists repeatedly?
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    <p>What is the fastest way to get lists of files and search through file lists repeatedly?</p> <p>Situation:</p> <ol> <li>There can be 5,000 to 35,000 files spread over 3-5 root directories (that have many subdirectories) on a network drive.</li> <li>There are three file types (tif, sus, img) that a user may or may not search for. Some file types can have 2-3 different file extensions.</li> <li>From a list of files (in various database tables), I need to find out if each file exists, and if it does, save the path only and filename only to a table.</li> <li>Searches on file names must be case sensitive but it would be nice to keep original case when saving the path to the table.</li> </ol> <p>Environment:</p> <p>C# and .NET 4.0 on Windows PC.</p> <p>Is this the fastest way?:</p> <p>Is the fastest way to use a dictionary, with FileName as a key (lowercase) and Path as a value (original case)? In this way I can get the index/Path at the same pass when I search for the filename? The FileName and Path are split up front when populating the list.</p> <pre><code>if (d.TryGetValue("key", out value)) { // Log "key" and value to table // only does one lookup } </code></pre> <p>Note: I am a bit concerned that I probably will have duplicate key values per FileType. When/If I run across this scenario what type of list and access method should I use?</p> <p>Maybe on these rare cases, I should populate another list of the duplicate keys. Because I will need to do at least one of: log/copy/delete of the files in any path.</p>
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    1. COI would probably create an object with "FullFilePath" and "FileName"/"Path" getters that extract those details from the path. Then, create a collection of those objects that you can iterate over. --but that's just me.
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      1. USBrad Christie
    2. CO@BradChristie So... the [`FileInfo`](http://msdn.microsoft.com/en-us/library/system.io.fileinfo.aspx) class, then?
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    3. CO@SpikeX: I thought about it, but FileInfo may be to heavy just for meta-data. It depends what you want to performance. I almost think a dumb struct set up in an [easily-searchable collection](http://stackoverflow.com/questions/1009107/what-net-collection-provides-the-fastest-search)
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