File System Watcher

The Following is the example for File System Watcher.

Create Console Application in Visual Studio.

File --> New --> Project

In the Template Select the Console Application.

Eg:

Namespaces Used:

using System.Security.Permissions;

using System.IO;

These two namespaces used for file operation and file permissions.

Code:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Security.Permissions;

using System.IO;

namespace Watcher

{

    public class Watcher

    {

         public static void Main()

        {

            Run();

        }

        [PermissionSet(SecurityAction.Demand, Name = "FullTrust")]

        public static void Run()

        {

            // Create a new FileSystemWatcher and set its properties.

            FileSystemWatcher watcher = new FileSystemWatcher();

            watcher.Path = @"D:\Pilot\Sam\Projects\Watcher";

            /* Watch for changes in the renaming of files. */

            watcher.NotifyFilter = NotifyFilters.FileName;

            watcher.IncludeSubdirectories = false;

            // Only watch txt files. This property is optional

            watcher.Filter = "*.txt";

            // Add event handlers.

            watcher.Created += new FileSystemEventHandler(OnCreated);

            // Begin watching.

            watcher.EnableRaisingEvents = true;

            // Wait for the user to quit the program.

            Console.WriteLine("Press \'q\' to quit the Watcher.");

            while (Console.Read() != 'q') ;

        }

        // Define the event handlers.

        private static void OnCreated(object source, FileSystemEventArgs e)

        {

            // Specify what is done when a file is created.

            Console.WriteLine("File: " + e.FullPath + " " + e.ChangeType);

            try

            {

                StreamReader reader = File.OpenText(e.FullPath);

                string line = null;

                while ((line = reader.ReadLine()) != null)

                {

                    Console.Write(line + Environment.NewLine);

                }

            }

            catch (Exception ex)

            {

                Console.Clear();

                Console.WriteLine(ex);

            }

        }

    }

}

 Run the Console application.

It watches the  path "D:\Pilot\Sam\Projects\Watcher".

Steps to watch the output.

1. Create a text file with some content.
2. Copy that file and paste it to your project folder.
3. Then watch the output in Watcher.

Output:

Uses:

1. We can upload the excel (.xls) file format via web. In the web server, the upload watcher is being run always and watching at the particular folder path.
2. If any upload happens via web it can be saved in that watcher path.
3. Once file uploaded, the upload watcher catches that file and performs the database actions.