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Using FileSystemWatcher to monitor multiple directories

, 20 Oct 2011
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There are times that we need to monitor multiple directories and if any changes are available, invoke a given method.

In a previous example, I have showed how to use the FileSystemWatcher class to monitor a directory. But there are times that we need to monitor multiple directories and if any changes are available, invoke a given method.

We can do that by using the following method. First create a class. We’ll call this class Watcher.

   1: public class Watcher
   2:     {
   3:  
   4:         public string Directory { get; set; }
   5:         public string  Filter { get; set; }
   6:  
   7:  
   8:         private Delegate _changeMethod;
   9:  
  10:         public Delegate ChangeMethod
  11:         {
  12:             get { return _changeMethod; }
  13:             set { _changeMethod = value; }
  14:         }
  15:         
  16:         FileSystemWatcher fileSystemWatcher = new FileSystemWatcher();
  17:  
  18:         public Watcher(string directory, string filter, Delegate invokeMethod)
  19:         {
  20:             this._changeMethod = invokeMethod;
  21:             this.Directory = directory;
  22:             this.Filter = Filter;
  23:         }
  24:  
  25:  
  26:         public void StartWatch()
  27:         {
  28:             
  29:             
  30:             fileSystemWatcher.Filter = this.Filter;
  31:             fileSystemWatcher.Path = this.Directory;
  32:             fileSystemWatcher.EnableRaisingEvents = true;
  33:  
  34:             fileSystemWatcher.Changed += 
                    new FileSystemEventHandler(fileSystemWatcher_Changed);
  35:         }
  36:  
  37:         void fileSystemWatcher_Changed(object sender, FileSystemEventArgs e)
  38:         {
  39:             if (_changeMethod != null)
  40:             {
  41:                 _changeMethod.DynamicInvoke(sender, e);
  42:             }
  43:         }
  44:     }

And we can use it to monitor multiple directories as shown below (for this example, I have used a console application and I am only considering the change event):

   1: class Program
   2:     {
   3:         delegate void invokeMethodDelegate(object sender, FileSystemEventArgs e);
   4:  
   5:         static void Main(string[] args)
   6:         {
   7:             
   8:             invokeMethodDelegate mymethod = new invokeMethodDelegate(InvokeMethod);
   9:             Watcher w1 = new Watcher(@"C:\Directory1", "*.*", mymethod);
  10:             w1.StartWatch();
  11:  
  12:             Watcher w2 = new Watcher(@"D:\Directory2", "*.*", mymethod);
  13:             w2.StartWatch();
  14:  
  15:             string zRetVal = Console.ReadLine();
  16:  
  17:            
  18:         }
  19:  
  20:         static  void InvokeMethod(object sender, FileSystemEventArgs e)
  21:         {
  22:             Console.WriteLine("Change in file {0}", e.FullPath);
  23:         }
  24:     }

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

Manjuke Fernando
Technical Lead Air Liquide Industrial Services (Singapore)
Singapore Singapore
I have been in software industry for more than 8 years. I have developed different type of software using different languages. Many of them are database related (both web & window based), SQL being as the back end most of the time. Up-to-date I have knowledge in languages such as C#, VB.Net, T-SQL, JAVA, VB6 & C++, making C# the most proficient of all. Also I have worked using different technologies like ASP.Net, SharePoint, Crystal Reports (But I really hate designing reports) & MS SQL Server and have involved in designing & developing software for major companies like FedEx, Softlogic Holdings, IronOne Technologies & Brandix. Currently I am working as a Tech Lead in Singapore.
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Comments and Discussions

 
QuestionService version? PinmemberDan Oviatt26-Jun-12 10:28 
AnswerRe: Service version? PinmemberManjuke Fernando26-Jun-12 16:19 
GeneralRe: Service version? PinmemberDan Oviatt27-Jun-12 3:19 
GeneralRe: Service version? Pinmemberjustmicros13-Nov-12 9:57 
GeneralRe: Service version? PinmemberManjuke Fernando13-Nov-12 13:33 
Questionvery interesting artice Pinmembermike231521-Oct-11 2:32 

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