FileSystemWatcher.Deleted Kejadian
Definisi
Penting
Beberapa informasi terkait produk prarilis yang dapat diubah secara signifikan sebelum dirilis. Microsoft tidak memberikan jaminan, tersirat maupun tersurat, sehubungan dengan informasi yang diberikan di sini.
Terjadi ketika file atau direktori dalam yang ditentukan Path dihapus.
public:
event System::IO::FileSystemEventHandler ^ Deleted;public event System.IO.FileSystemEventHandler? Deleted;public event System.IO.FileSystemEventHandler Deleted;[System.IO.IODescription("FSW_Deleted")]
public event System.IO.FileSystemEventHandler Deleted;member this.Deleted : System.IO.FileSystemEventHandler [<System.IO.IODescription("FSW_Deleted")>]
member this.Deleted : System.IO.FileSystemEventHandler Public Custom Event Deleted As FileSystemEventHandler Jenis Acara
- Atribut
Contoh
Contoh berikut menggunakan peristiwa untuk menampilkan jalur file ke konsol Deleted setiap kali file yang ditonton dihapus.
#include "pch.h"
using namespace System;
using namespace System::IO;
class MyClassCPP
{
public:
int static Run()
{
FileSystemWatcher^ watcher = gcnew FileSystemWatcher("C:\\path\\to\\folder");
watcher->NotifyFilter = static_cast<NotifyFilters>(NotifyFilters::Attributes
| NotifyFilters::CreationTime
| NotifyFilters::DirectoryName
| NotifyFilters::FileName
| NotifyFilters::LastAccess
| NotifyFilters::LastWrite
| NotifyFilters::Security
| NotifyFilters::Size);
watcher->Changed += gcnew FileSystemEventHandler(MyClassCPP::OnChanged);
watcher->Created += gcnew FileSystemEventHandler(MyClassCPP::OnCreated);
watcher->Deleted += gcnew FileSystemEventHandler(MyClassCPP::OnDeleted);
watcher->Renamed += gcnew RenamedEventHandler(MyClassCPP::OnRenamed);
watcher->Error += gcnew ErrorEventHandler(MyClassCPP::OnError);
watcher->Filter = "*.txt";
watcher->IncludeSubdirectories = true;
watcher->EnableRaisingEvents = true;
Console::WriteLine("Press enter to exit.");
Console::ReadLine();
return 0;
}
private:
static void OnChanged(Object^ sender, FileSystemEventArgs^ e)
{
if (e->ChangeType != WatcherChangeTypes::Changed)
{
return;
}
Console::WriteLine("Changed: {0}", e->FullPath);
}
static void OnCreated(Object^ sender, FileSystemEventArgs^ e)
{
Console::WriteLine("Created: {0}", e->FullPath);
}
static void OnDeleted(Object^ sender, FileSystemEventArgs^ e)
{
Console::WriteLine("Deleted: {0}", e->FullPath);
}
static void OnRenamed(Object^ sender, RenamedEventArgs^ e)
{
Console::WriteLine("Renamed:");
Console::WriteLine(" Old: {0}", e->OldFullPath);
Console::WriteLine(" New: {0}", e->FullPath);
}
static void OnError(Object^ sender, ErrorEventArgs^ e)
{
PrintException(e->GetException());
}
static void PrintException(Exception^ ex)
{
if (ex != nullptr)
{
Console::WriteLine("Message: {0}", ex->Message);
Console::WriteLine("Stacktrace:");
Console::WriteLine(ex->StackTrace);
Console::WriteLine();
PrintException(ex->InnerException);
}
}
};
int main()
{
MyClassCPP::Run();
}
using System;
using System.IO;
namespace MyNamespace
{
class MyClassCS
{
static void Main()
{
using var watcher = new FileSystemWatcher(@"C:\path\to\folder");
watcher.NotifyFilter = NotifyFilters.Attributes
| NotifyFilters.CreationTime
| NotifyFilters.DirectoryName
| NotifyFilters.FileName
| NotifyFilters.LastAccess
| NotifyFilters.LastWrite
| NotifyFilters.Security
| NotifyFilters.Size;
watcher.Changed += OnChanged;
watcher.Created += OnCreated;
watcher.Deleted += OnDeleted;
watcher.Renamed += OnRenamed;
watcher.Error += OnError;
watcher.Filter = "*.txt";
watcher.IncludeSubdirectories = true;
watcher.EnableRaisingEvents = true;
Console.WriteLine("Press enter to exit.");
Console.ReadLine();
}
private static void OnChanged(object sender, FileSystemEventArgs e)
{
if (e.ChangeType != WatcherChangeTypes.Changed)
{
return;
}
Console.WriteLine($"Changed: {e.FullPath}");
}
private static void OnCreated(object sender, FileSystemEventArgs e)
{
string value = $"Created: {e.FullPath}";
Console.WriteLine(value);
}
private static void OnDeleted(object sender, FileSystemEventArgs e) =>
Console.WriteLine($"Deleted: {e.FullPath}");
private static void OnRenamed(object sender, RenamedEventArgs e)
{
Console.WriteLine($"Renamed:");
Console.WriteLine($" Old: {e.OldFullPath}");
Console.WriteLine($" New: {e.FullPath}");
}
private static void OnError(object sender, ErrorEventArgs e) =>
PrintException(e.GetException());
private static void PrintException(Exception? ex)
{
if (ex != null)
{
Console.WriteLine($"Message: {ex.Message}");
Console.WriteLine("Stacktrace:");
Console.WriteLine(ex.StackTrace);
Console.WriteLine();
PrintException(ex.InnerException);
}
}
}
}
Imports System.IO
Namespace MyNamespace
Class MyClassVB
Shared Sub Main()
Using watcher = New FileSystemWatcher("C:\path\to\folder")
watcher.NotifyFilter = NotifyFilters.Attributes Or
NotifyFilters.CreationTime Or
NotifyFilters.DirectoryName Or
NotifyFilters.FileName Or
NotifyFilters.LastAccess Or
NotifyFilters.LastWrite Or
NotifyFilters.Security Or
NotifyFilters.Size
AddHandler watcher.Changed, AddressOf OnChanged
AddHandler watcher.Created, AddressOf OnCreated
AddHandler watcher.Deleted, AddressOf OnDeleted
AddHandler watcher.Renamed, AddressOf OnRenamed
AddHandler watcher.Error, AddressOf OnError
watcher.Filter = "*.txt"
watcher.IncludeSubdirectories = True
watcher.EnableRaisingEvents = True
Console.WriteLine("Press enter to exit.")
Console.ReadLine()
End Using
End Sub
Private Shared Sub OnChanged(sender As Object, e As FileSystemEventArgs)
If e.ChangeType <> WatcherChangeTypes.Changed Then
Return
End If
Console.WriteLine($"Changed: {e.FullPath}")
End Sub
Private Shared Sub OnCreated(sender As Object, e As FileSystemEventArgs)
Dim value As String = $"Created: {e.FullPath}"
Console.WriteLine(value)
End Sub
Private Shared Sub OnDeleted(sender As Object, e As FileSystemEventArgs)
Console.WriteLine($"Deleted: {e.FullPath}")
End Sub
Private Shared Sub OnRenamed(sender As Object, e As RenamedEventArgs)
Console.WriteLine($"Renamed:")
Console.WriteLine($" Old: {e.OldFullPath}")
Console.WriteLine($" New: {e.FullPath}")
End Sub
Private Shared Sub OnError(sender As Object, e As ErrorEventArgs)
PrintException(e.GetException())
End Sub
Private Shared Sub PrintException(ex As Exception)
If ex IsNot Nothing Then
Console.WriteLine($"Message: {ex.Message}")
Console.WriteLine("Stacktrace:")
Console.WriteLine(ex.StackTrace)
Console.WriteLine()
PrintException(ex.InnerException)
End If
End Sub
End Class
End Namespace
Keterangan
Beberapa kemunculan umum, seperti menyalin atau memindahkan file atau direktori, tidak sesuai langsung dengan peristiwa, tetapi kejadian ini menyebabkan peristiwa dinaikkan. Saat Anda menyalin file atau direktori, sistem akan menaikkan Created peristiwa di direktori tempat file disalin, jika direktori tersebut sedang diawasi. Jika direktori tempat Anda menyalin sedang diawasi oleh instans FileSystemWatcherlain , tidak ada peristiwa yang akan dinaikkan. Misalnya, Anda membuat dua instans FileSystemWatcher. FileSystemWatcher1 diatur ke watch "C:\My Documents", dan FileSystemWatcher2 diatur ke watch "C:\Your Documents". Jika Anda menyalin file dari "Dokumen Saya" ke "Dokumen Anda", Created peristiwa akan dimunculkan oleh FileSystemWatcher2, tetapi tidak ada peristiwa yang dimunculkan untuk FileSystemWatcher1. Tidak seperti menyalin, memindahkan file atau direktori akan memunculkan dua peristiwa. Dari contoh sebelumnya, jika Anda memindahkan file dari "Dokumen Saya" ke "Dokumen Anda", Created peristiwa akan dimunculkan oleh FileSystemWatcher2 dan Deleted peristiwa akan dimunculkan oleh FileSystemWatcher1.
Catatan
Operasi sistem file umum mungkin memunculkan lebih dari satu peristiwa. Misalnya, ketika file dipindahkan dari satu direktori ke direktori lain, beberapa dan beberapa OnChangedOnCreated dan OnDeleted peristiwa mungkin dimunculkan. Memindahkan file adalah operasi kompleks yang terdiri dari beberapa operasi sederhana, oleh karena itu meningkatkan beberapa peristiwa. Demikian juga, beberapa aplikasi (misalnya, perangkat lunak antivirus) dapat menyebabkan peristiwa sistem file tambahan yang terdeteksi oleh FileSystemWatcher.
Catatan
Urutan di mana Deleted peristiwa dinaikkan sehubungan dengan peristiwa lain FileSystemWatcher dapat berubah ketika SynchronizingObject properti bukan null.
