Monitor file system .net

Raises the Created event. Raises the Deleted event. Raises the Error event. Raises the Renamed event. Returns a String containing the name of the Component , if any. This method should not be overridden. A synchronous method that returns a structure that contains specific information on the change that occurred, given the type of change you want to monitor.

A synchronous method that returns a structure that contains specific information on the change that occurred, given the type of change you want to monitor and the time in milliseconds to wait before timing out. Occurs when a file or directory in the specified Path is changed. Occurs when a file or directory in the specified Path is created. Occurs when a file or directory in the specified Path is deleted. Occurs when the component is disposed by a call to the Dispose method.

Occurs when the instance of FileSystemWatcher is unable to continue monitoring changes or when the internal buffer overflows. Occurs when a file or directory in the specified Path is renamed. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode.

Please rate your experience Yes No. Any additional feedback? Namespace: System. IO Assembly: System. ISupportInitialize IDisposable. In this article. Changed , Created , Deleted. FileSystemWatcher String. FileSystemWatcher String, String. Gets a value indicating whether the component can raise an event.

Inherited from Component. Gets or sets the filter string used to determine what files are monitored in a directory. CreateObjRef Type. Inherited from MarshalByRefObject. Dispose Boolean. Equals Object. Determines whether the specified object is equal to the current object. Inherited from Object. Serves as the default hash function. The FileSystemWatcher object also lets you monitor a given directory for file updates.

The following code is very similar to the one referred to in the above link. The difference is that we subscribe to the Renamed event:. Again, we have the Console. If you run this code and rename a file in the monitored directory you may see an output similar to the following:.

It can happen that there are more changes than the FileSystemWatcher object can handle. In that case FileSystemWatcher raises the Error event which you can subscribe to as follows:. We set the path to be monitored as usual. We can filter the file names to be monitored. With NotifyFilter we can further refine the cases when we want to be notified of a file change. Here we want to be notified if either the file size changes or the security properties have been updated.

Then we subscribe to the generic Changed event which is raised in case an existing file changes. Filed under. About Andras Nemes I'm a. Andras, thank you for the post. In the past when using the FileSystemWatcher there were issues with large file sizes. Do you know if this problem has been fixed or do we still have to do the awkward workarounds to handle this in the latest version of the framework core and regular.

You are commenting using your WordPress. You are commenting using your Google account. You are commenting using your Twitter account. You are commenting using your Facebook account. Notify me of new comments via email. Once the items are dropped to windows form, we need to add four event handlers for the FileSystemWatcher FileMon component.

The picture below shows the event handler kept for the FileMon:. First, we declare the required variables. We will see the use of it when we progress through the coding. Event handler provided for the close and Clear Content is straightforward.

The code for that is given below:. To spy the files inside the sub-folder we should set IncludeSubdirectories Property to true. We can set this property only when we have a valid path and it is set through the Path Property. Below is the code:.

In the previous step we saw the code that set the IncludeSubdirectories and this property of the FileSystemWatcher Component become meaningful only when we have a valid path to monitor. The Path Property of the component will be used to specify from where exactly we want to monitor the files.

Then our example uses this path to monitor the file system. And the Recursive checkbox will tell we need to monitor this selected path, recursively or not. Below is the piece code:. Once it raises the events, we will get the spied events in the corresponding handler functions. So, we set this property when we click the Start Monitor button.

Below is the piece of code:. The recursive checkbox will set the IncludeSubdirectories property of the component. We will get an application exception when we set this property to true when the Path property does not contain any valid path to monitor. So below is the piece of code which looks after this case:. Now, we will handle all the four events shown in Fig.

In each handler, we will get the filename from the FileSystemEventArgs , which will come to the handler as a parameter.

As we already inside the handler, we know the corresponding action say whether it is a file deletion or Rename, etc. On each handler, we will check the status of the Filter check boxes and display the information only when the corresponding check box is checked.