FileSystemWatcher.NotifyFilter FileSystemWatcher.NotifyFilter FileSystemWatcher.NotifyFilter FileSystemWatcher.NotifyFilter Property

Definição

Obtém ou define o tipo de alterações a serem observadas.Gets or sets the type of changes to watch for.

public:
 property System::IO::NotifyFilters NotifyFilter { System::IO::NotifyFilters get(); void set(System::IO::NotifyFilters value); };
[System.IO.IODescription("Flag to indicate which change event we want to monitor")]
[System.IO.IODescription("FSW_ChangedFilter")]
public System.IO.NotifyFilters NotifyFilter { get; set; }
member this.NotifyFilter : System.IO.NotifyFilters with get, set
Public Property NotifyFilter As NotifyFilters

Valor da propriedade

Um dos valores de NotifyFilters.One of the NotifyFilters values. O padrão é a combinação OR bit a bit de LastWrite, FileName e DirectoryName.The default is the bitwise OR combination of LastWrite, FileName, and DirectoryName.

Exceções

O valor não é uma combinação OR bit a bit válida dos valores NotifyFilters.The value is not a valid bitwise OR combination of the NotifyFilters values.

O valor que está sendo definido não é válido.The value that is being set is not valid.

Exemplos

O exemplo a seguir cria FileSystemWatcher um para observar o diretório especificado em tempo de execução.The following example creates a FileSystemWatcher to watch the directory specified at run time. O componente é definido para observar as alterações em LastWrite e LastAccess hora, a criação, a exclusão ou a renomeação de arquivos de texto no diretório.The component is set to watch for changes in LastWrite and LastAccess time, the creation, deletion, or renaming of text files in the directory. Se um arquivo for alterado, criado ou excluído, o caminho para o arquivo será impresso no console.If a file is changed, created, or deleted, the path to the file prints to the console. Quando um arquivo é renomeado, os caminhos novos e antigos são impressos no console do.When a file is renamed, the old and new paths print to the console.

#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
Imports System.IO
Imports System.Security.Permissions
Imports Microsoft.VisualBasic

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

Comentários

Você pode combinar os membros da NotifyFilters enumeração para observar mais de um tipo de alteração por vez.You can combine the members of the NotifyFilters enumeration to watch for more than one type of change at a time. Por exemplo, você pode observar as alterações no tamanho de um arquivo e para as alterações no LastWrite tempo.For example, you can watch for changes in size of a file, and for changes in the LastWrite time. Isso gera um evento a qualquer momento em que há uma alteração no tamanho do arquivo ou da pasta, LastWrite ou uma alteração no horário do arquivo ou da pasta.This raises an event anytime there is a change in file or folder size, or a change in the LastWrite time of the file or folder.

Essa é uma maneira de filtrar notificações indesejadas.This is one way to filter out unwanted notifications. Para obter mais informações sobre como filtrar notificações indesejadas Filter, IncludeSubdirectoriesconsulte as InternalBufferSize Propriedades, e.For more information on filtering out unwanted notifications, see the Filter, IncludeSubdirectories, and InternalBufferSize properties.

Aplica-se a

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