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  • Your email address will not be published.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

  • Live Event Date: October 29, 2014 @ 11:00 a.m. ET / 8:00 a.m. PT Are you interested in building a cognitive application using the power of IBM Watson? Need a platform that provides speed and ease for rapidly deploying this application? Join Chris Madison, Watson Solution Architect, as he walks through the process of building a Watson powered application on IBM Bluemix. Chris will talk about the new Watson Services just released on IBM bluemix, but more importantly he will do a step by step cognitive …

  • Packaged application development teams frequently operate with limited testing environments due to time and labor constraints. By virtualizing the entire application stack, packaged application development teams can deliver business results faster, at higher quality, and with lower risk.

Most Popular Programming Stories

More for Developers

Latest Developer Headlines

RSS Feeds