Question:
Good afternoon. I'm trying to write a tiny c# program that will monitor the activity of a given folder and display information about the time the Label was last modified. Tried to implement this process through While:
public partial class Form1 : Form
{
bool start = true;
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
button1.Text = ("Начать проверку");
button2.Text = ("Остановить проверку");
}
private void button1_Click(object sender, EventArgs e)
{
while (start == false)
{
DirectoryInfo dir = new DirectoryInfo(@"C:\Users");
label1.Text = ("Полный путь: " + dir.FullName);
label2.Text = ("Последнее обновление: " + dir.LastWriteTime);
}
}
}
But, this code example does nothing at all.
Answer:
Link:
Here's a link to an introduction to watching filesystem events !
There it is just written about monitoring the events of the file system and there are examples.
FileSystemWatcher.Changed – The event occurs when a file or directory in the specified Path is changed.
FileSystemWatcher.Renamed – The event occurs when a file or directory in the specified Path is renamed.
The Changed event occurs unexpectedly when a file is renamed, but it does not occur when a directory name is changed.
Use the Renamed event to track renames.
Example:
public class Watcher
{
public static void Main()
{
Run();
}
[PermissionSet(SecurityAction.Demand, Name="FullTrust")]
public static void Run()
{
string[] args = System.Environment.GetCommandLineArgs();
// If a directory is not specified, exit program.
if(args.Length != 2)
{
// Display the proper way to call the program.
Console.WriteLine("Usage: Watcher.exe (directory)");
return;
}
// Create a new FileSystemWatcher and set its properties.
FileSystemWatcher watcher = new FileSystemWatcher();
watcher.Path = args[1];
/* Watch for changes in LastAccess and LastWrite times, and
the renaming of files or directories. */
watcher.NotifyFilter = NotifyFilters.LastAccess | NotifyFilters.LastWrite
| NotifyFilters.FileName | NotifyFilters.DirectoryName;
// Only watch text files.
watcher.Filter = "*.txt";
// Add event handlers.
watcher.Changed += new FileSystemEventHandler(OnChanged);
watcher.Created += new FileSystemEventHandler(OnChanged);
watcher.Deleted += new FileSystemEventHandler(OnChanged);
watcher.Renamed += new RenamedEventHandler(OnRenamed);
// Begin watching.
watcher.EnableRaisingEvents = true;
// Wait for the user to quit the program.
Console.WriteLine("Press \'q\' to quit the sample.");
while(Console.Read()!='q');
}
// Define the event handlers.
private static void OnChanged(object source, FileSystemEventArgs e)
{
// Specify what is done when a file is changed, created, or deleted.
Console.WriteLine("File: " + e.FullPath + " " + e.ChangeType);
}
private static void OnRenamed(object source, RenamedEventArgs e)
{
// Specify what is done when a file is renamed.
Console.WriteLine("File: {0} renamed to {1}", e.OldFullPath, e.FullPath);
}
}