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POHow does EnumerateFiles() work?
 

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  1. POHow does EnumerateFiles() work?
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    <p>I am writing a program that, when given a date, folder path, and file extension, will look into the folder and will go find all files that had a last access time from the beginning of the month to the current date, and only files with the file extension that was passed.</p> <p>The files that I am looking for are always in the same level in the folder tree so I can code into the program how far to dig to find the files.</p> <p>Currently my program takes about a minute for a day so today (The 16th) takes about sixteen and a half minutes.</p> <p>I want to make a program that fill find all files for a date range in a folder path and will extract information from the file. I just don't want to code how deep the program has to look in case my business changes how they store their files.</p> <p>I managed to make code that, if given a folder, the program will display the names of all the files for the date range but that took 25 minutes. Here is the code</p> <pre><code>TimeSpan BeginningTime = DateTime.Now.TimeOfDay; DateTime BeginningDate = new DateTime(DateTime.Now.Year, DateTime.Now.Month, 1); DateTime EndingDate = DateTime.Now; string[] FoldersToLookAt = { @"e:\", @"e:\Kodak Images\", @"e:\images\", @"e:\AFSImageMerge\" }; foreach (string FolderPath in FoldersToLookAt) { for (DateTime Date = BeginningDate; Date &lt;= EndingDate; Date = Date.AddDays(1)) { string DateString = Date.ToString("yyMMdd"); string FilePath = (FolderPath + DateString); DirectoryInfo FilesToLookThrough = new DirectoryInfo(FilePath); if (FilesToLookThrough.Exists) { foreach (var MyFile in FilesToLookThrough.EnumerateFiles("*.dat", SearchOption.AllDirectories)) { if (MyFile.LastAccessTime &gt;= BeginningDate) { Console.WriteLine(MyFile.FullName); } } } } } </code></pre> <p>From what I see this first obtains all the files, then goes through all files and prints out all files that have a last access time greater than the beginning date.</p> <p>Is their a way in C# that will extract information from a file and NOT store it in a list? Or am I going to have to build the program from scratch?</p>
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      1. POHow does EnumerateFiles() work?
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    1. COI'd assume `EnumerateFiles` uses `yield return` instead of building a full list, but I may be wrong... How many files are you looking through?
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      1. USRobert Rouhani
    2. COWhy does the code take so long? How many files are there is each directory?
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    3. CO@RobertRouhani I am going through about 6000 files.
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