FileSystemWatcher.Deleted Zdarzenie

Definicja

Występuje, gdy zostanie usunięty plik lub katalog z Path określonego elementu.Occurs when a file or directory in the specified Path is deleted.

public:
 event System::IO::FileSystemEventHandler ^ Deleted;
[System.IO.IODescription("Occurs when a file/directory deletion matches the filter")]
[System.IO.IODescription("FSW_Deleted")]
public event System.IO.FileSystemEventHandler Deleted;
member this.Deleted : System.IO.FileSystemEventHandler 
Public Custom Event Deleted As FileSystemEventHandler 
Atrybuty

Przykłady

Poniższy przykład używa Deleted zdarzenia do wyświetlania ścieżki pliku do konsoli za każdym razem, gdy plik obserwowany zostanie usunięty.The following example uses the Deleted event to display the file path to the console whenever the watched file is deleted.

#using <System.dll>

using namespace System;
using namespace System::IO;
using namespace System::Security::Permissions;

public ref class Watcher
{
private:
   // Define the event handlers.
   static void OnChanged( Object^ /*source*/, FileSystemEventArgs^ e )
   {
      // Specify what is done when a file is changed, created, or deleted.
      Console::WriteLine( "File: {0} {1}", e->FullPath, e->ChangeType );
   }

   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 );
   }

public:
   [PermissionSet(SecurityAction::Demand, Name="FullTrust")]
   int static run()
   {
      array<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 0;
      }

      // Create a new FileSystemWatcher and set its properties.
      FileSystemWatcher^ watcher = gcnew FileSystemWatcher;
      watcher->Path = args[ 1 ];

      /* Watch for changes in LastAccess and LastWrite times, and 
          the renaming of files or directories. */
      watcher->NotifyFilter = static_cast<NotifyFilters>(NotifyFilters::LastAccess |
            NotifyFilters::LastWrite | NotifyFilters::FileName | NotifyFilters::DirectoryName);

      // Only watch text files.
      watcher->Filter = "*.txt";

      // Add event handlers.
      watcher->Changed += gcnew FileSystemEventHandler( Watcher::OnChanged );
      watcher->Created += gcnew FileSystemEventHandler( Watcher::OnChanged );
      watcher->Deleted += gcnew FileSystemEventHandler( Watcher::OnChanged );
      watcher->Renamed += gcnew RenamedEventHandler( Watcher::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' );

      return 0;
   }
};

int main() {
   Watcher::run();
}
using System;
using System.IO;
using System.Security.Permissions;

public class Watcher
{
    public static void Main()
    {
        Run();
    }

    [PermissionSet(SecurityAction.Demand, Name = "FullTrust")]
    private static void Run()
    {
        string[] args = 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.
        using (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 += OnChanged;
            watcher.Created += OnChanged;
            watcher.Deleted += OnChanged;
            watcher.Renamed += 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: {e.OldFullPath} renamed to {e.FullPath}");
}
Imports System.IO
Imports System.Security.Permissions

Public Class Watcher

    Public Shared Sub Main()

        Run()

    End Sub

    <PermissionSet(SecurityAction.Demand, Name:="FullTrust")>
    Private Shared Sub Run()

        Dim args() As String = Environment.GetCommandLineArgs()

        ' If a directory is not specified, exit the program.
        If args.Length <> 2 Then
            ' Display the proper way to call the program.
            Console.WriteLine("Usage: Watcher.exe (directory)")
            Return
        End If

        ' Create a new FileSystemWatcher and set its properties.
        Using watcher As 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 _
                                 Or NotifyFilters.LastWrite _
                                 Or NotifyFilters.FileName _
                                 Or NotifyFilters.DirectoryName)

            ' Only watch text files.
            watcher.Filter = "*.txt"

            ' Add event handlers.
            AddHandler watcher.Changed, AddressOf OnChanged
            AddHandler watcher.Created, AddressOf OnChanged
            AddHandler watcher.Deleted, AddressOf OnChanged
            AddHandler watcher.Renamed, AddressOf OnRenamed

            ' Begin watching.
            watcher.EnableRaisingEvents = True

            ' Wait for the user to quit the program.
            Console.WriteLine("Press 'q' to quit the sample.")
            While Chr(Console.Read()) <> "q"c
            End While
        End Using
    End Sub

    ' Define the event handlers.
    Private Shared Sub OnChanged(source As Object, e As FileSystemEventArgs)
        ' Specify what is done when a file is changed, created, or deleted.
        Console.WriteLine($"File: {e.FullPath} {e.ChangeType}")
    End Sub

    Private Shared Sub OnRenamed(source As Object, e As RenamedEventArgs)
        ' Specify what is done when a file is renamed.
        Console.WriteLine($"File: {e.OldFullPath} renamed to {e.FullPath}")
    End Sub

End Class

Uwagi

Niektóre typowe wystąpienia, takie jak kopiowanie lub przeniesienie pliku lub katalogu, nie są bezpośrednio powiązane ze zdarzeniem, ale te wystąpienia powodują podniesienie poziomu zdarzeń.Some common occurrences, such as copying or moving a file or directory, do not correspond directly to an event, but these occurrences do cause events to be raised. Podczas kopiowania pliku lub katalogu system zgłasza Created zdarzenie w katalogu, do którego plik został skopiowany, jeśli ten katalog jest monitorowany.When you copy a file or directory, the system raises a Created event in the directory to which the file was copied, if that directory is being watched. Jeśli katalog FileSystemWatcher, z którego została skopiowana była obserwowana przez inne wystąpienie, nie zostanie zgłoszone żadne zdarzenie.If the directory from which you copied was being watched by another instance of FileSystemWatcher, no event would be raised. Można na przykład utworzyć dwa wystąpienia programu FileSystemWatcher.For example, you create two instances of FileSystemWatcher. FileSystemWatcher1 jest ustawiony na Obejrzyj "C:\Moje dokumenty", a FileSystemWatcher2 jest ustawiony na Obejrzyj "C:\Your dokumenty".FileSystemWatcher1 is set to watch "C:\My Documents", and FileSystemWatcher2 is set to watch "C:\Your Documents". Jeśli skopiujesz plik z folderu "Moje dokumenty" do folderu "dokumenty", Created zdarzenie zostanie zgłoszone przez FileSystemWatcher2, ale żadne zdarzenie nie zostanie zgłoszone dla FileSystemWatcher1.If you copy a file from "My Documents" into "Your Documents", a Created event will be raised by FileSystemWatcher2, but no event is raised for FileSystemWatcher1. W przeciwieństwie do kopiowania, przeniesienie pliku lub katalogu spowodowałoby wystąpienie dwóch zdarzeń.Unlike copying, moving a file or directory would raise two events. W poprzednim przykładzie, jeśli przeniesiono plik z lokalizacji "Moje dokumenty" do "dokumentów", Created zdarzenie zostanie wywołane przez FileSystemWatcher2 Deleted , a zdarzenie zostanie wywołane przez FileSystemWatcher1.From the previous example, if you moved a file from "My Documents" to "Your Documents", a Created event would be raised by FileSystemWatcher2 and a Deleted event would be raised by FileSystemWatcher1.

Uwaga

Typowe operacje systemu plików mogą spowodować wystąpienie więcej niż jednego zdarzenia.Common file system operations might raise more than one event. Na przykład, gdy plik jest przenoszony z jednego katalogu do innego, mogą OnChanged zostać zgłoszone OnDeleted kilka OnCreated i zdarzenia.For example, when a file is moved from one directory to another, several OnChanged and some OnCreated and OnDeleted events might be raised. Przeniesienie pliku jest skomplikowaną operacją, która składa się z wielu prostych operacji, a tym samym wywołuje wiele zdarzeń.Moving a file is a complex operation that consists of multiple simple operations, therefore raising multiple events. Podobnie niektóre aplikacje (na przykład oprogramowanie antywirusowe) mogą spowodować dodatkowe zdarzenia systemu plików, które są wykrywane przez FileSystemWatcherprogram.Likewise, some applications (for example, antivirus software) might cause additional file system events that are detected by FileSystemWatcher.

Uwaga

Kolejność, w Deleted której zdarzenie jest zgłaszane w odniesieniu do innych FileSystemWatcher SynchronizingObject zdarzeń, może ulec zmianie, gdy właściwość nullnie jest.The order in which the Deleted event is raised in relation to the other FileSystemWatcher events may change when the SynchronizingObject property is not null.

Dotyczy

Zobacz też