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POMultithreading within a loop c#
 

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  1. POMultithreading within a loop c#
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    <p>I am making a tool using c# that iterates through a large file directory and extracts certain information. The directory is organised by language (LCID), so I want to use multithreading to go through the directory- one thread per language folder. </p> <p>My code currently scans through a small number of the files and extracts the required data without multithreading, but on a large scale it will take too long.</p> <p>I set up a thread within my loop that gets the LCID folders, but got the following error: "no overload for 'HBscan' matches delegate System.threading.threadstart". From what I read online, I then put my method within a class so I could have parameters, and now there's no errors but the code is not iterating through the files properly. It is leaving files out of it's scan.</p> <p>I was wondering if anyone could see where I was going wrong with my code that's making it not perform properly? Thanks.</p> <pre><code>public static void Main(string[] args) { //change rootDirectory variable to point to directory which you wish to scan through string rootDirectory = @"C:\sample"; DirectoryInfo dir = new DirectoryInfo(rootDirectory); //get the LCIDs from the folders string[] filePaths = Directory.GetDirectories(rootDirectory); for (int i = 0; i &lt; filePaths.Length; i++) { string LCID = filePaths[i].Split('\\').Last(); Console.WriteLine(LCID); HBScanner scanner = new HBScanner(new DirectoryInfo(filePaths[i])); Thread t1 = new Thread(new ThreadStart(scanner.HBscan)); t1.Start(); } Console.WriteLine("Scanning through files..."); } public class HBScanner { private DirectoryInfo DirectoryToScan { get; set; } public HBScanner(DirectoryInfo startDir) { DirectoryToScan = startDir; } public void HBscan() { HBscan(DirectoryToScan); } public static void HBscan(DirectoryInfo directoryToScan) { //create an array of files using FileInfo object FileInfo[] files; //get all files for the current directory files = directoryToScan.GetFiles("*.*"); string asset = ""; string lcid = ""; //iterate through the directory and get file details foreach (FileInfo file in files) { String name = file.Name; DateTime lastModified = file.LastWriteTime; String path = file.FullName; //first check the file name for asset id using regular expression Regex regEx = new Regex(@"([A-Z][A-Z][0-9]{8,10})\."); asset = regEx.Match(file.Name).Groups[1].Value.ToString(); //get LCID from the file path using regular expression Regex LCIDregEx = new Regex(@"sample\\(\d{4,5})"); lcid = LCIDregEx.Match(file.FullName).Groups[1].Value.ToString(); //if it can't find it from filename, it looks into xml if (file.Extension == ".xml" &amp;&amp; asset == "") { System.Diagnostics.Debug.WriteLine("File is an .XML"); System.Diagnostics.Debug.WriteLine("file.FullName is: " + file.FullName); XmlDocument xmlDoc = new XmlDocument(); xmlDoc.Load(path); //load XML file in //check for &lt;assetid&gt; element XmlNode assetIDNode = xmlDoc.GetElementsByTagName("assetid")[0]; //check for &lt;Asset&gt; element XmlNode AssetIdNodeWithAttribute = xmlDoc.GetElementsByTagName("Asset")[0]; //if there is an &lt;assetid&gt; element if (assetIDNode != null) { asset = assetIDNode.InnerText; } else if (AssetIdNodeWithAttribute != null) //if there is an &lt;asset&gt; element, see if it has an AssetID attribute { //get the attribute asset = AssetIdNodeWithAttribute.Attributes["AssetId"].Value; if (AssetIdNodeWithAttribute.Attributes != null) { var attributeTest = AssetIdNodeWithAttribute.Attributes["AssetId"]; if (attributeTest != null) { asset = attributeTest.Value; } } } } Item newFile = new Item { AssetID = asset, LCID = lcid, LastModifiedDate = lastModified, Path = path, FileName = name }; Console.WriteLine(newFile); } //get sub-folders for the current directory DirectoryInfo[] dirs = directoryToScan.GetDirectories("*.*"); foreach (DirectoryInfo dir in dirs) { HBscan(dir); } } } </code></pre>
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    1. USRebeccaD
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      1. VTUpMod
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    1. CODid you try it *on a large scale*. Considering your program is IO intensive, it sounds like premature optimization.
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      1. USOndrej Tucny
    2. CODo files get left out of the scan when you just create and call the scanner instead of initiating threads?
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      1. USJames Snell
    3. COI have been told to use multithreading, so I need to implement it.
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