Find File Content Using the .NET IO Class

Environment: C#, Win9x/2000/XP

This is a very simple application that uses the .NET I/O class to search the files' content in a directory. I first used a DirectoryInfo class to get the directory information. Then, I saved the file list in a FileInfo array. You loop through the array and open each file for reading. Convert the buffer to string type, find the text, and raise an event when it's found.

The searching process can be time consuming. We can use the .NET delegate function to search asynchronously, as show below.

//declare a delegate function
private delegate void FindAsyn();

[STAThread]
static void Main(string[] args)
{

  FileFind ff = new FileFind();

  //subscribe the found file event
  ff.OnFileFound += new FoundDelegate(OnFoundFile);

  //The directory to be searched
  ff.PathName = @"C:\MyFileDir";
  //The text to be searched
  ff.FindText ="findtext";

  //delegate to...
  FindAsyn f = new FindAsyn(ff.StartSearch);
  //invoke the searching function asynchronously
  f.BeginInvoke(null,null);
  Console.Read();             // pause the screen;
  FileFind.bStopIt = true;    // stop it if the process takes
                              // too long.
  Console.Read();
  //unsubscribe the event
  ff.OnFileFound -= new FoundDelegate(OnFoundFile);

}

private static void OnFoundFile(string filename)
{
  Console.WriteLine(filename);
}

Downloads

Download demo project - 7 Kb
Download source - 3 Kb


Comments

  • There are no comments yet. Be the first to comment!

Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • On-demand Event Event Date: February 12, 2015 The evolution of systems engineering with the SysML modeling language has resulted in improved requirements specification, better architectural definition, and better hand-off to downstream engineering. Agile methods have proven successful in the software domain, but how can these methods be applied to systems engineering? Check out this webcast and join Bruce Powel Douglass, author of Real-Time Agility, as he discusses how agile methods have had a tremendous …

  • Live Event Date: March 19, 2015 @ 1:00 p.m. ET / 10:00 a.m. PT The 2015 Enterprise Mobile Application Survey asked 250 mobility professionals what their biggest mobile challenges are, how many employees they are equipping with mobile apps, and their methods for driving value with mobility. Join Dan Woods, Editor and CTO of CITO Research, and Alan Murray, SVP of Products at Apperian, as they break down the results of this survey and discuss how enterprises are using mobile application management and private …

Most Popular Programming Stories

More for Developers

RSS Feeds

Thanks for your registration, follow us on our social networks to keep up-to-date