FileSystemWatcher.Deleted 事件
删除指定 Path 中的文件或目录时发生。
**命名空间:**System.IO
**程序集:**System（在 system.dll 中）
语法
声明
Public Event Deleted As FileSystemEventHandler
用法
Dim instance As FileSystemWatcher
Dim handler As FileSystemEventHandler
AddHandler instance.Deleted, handler
public event FileSystemEventHandler Deleted
public:
event FileSystemEventHandler^ Deleted {
void add (FileSystemEventHandler^ value);
void remove (FileSystemEventHandler^ value);
}
/** @event */
public void add_Deleted (FileSystemEventHandler value)
/** @event */
public void remove_Deleted (FileSystemEventHandler value)
JScript 支持使用事件，但不支持进行新的声明。
备注
某些常见操作（如复制或移动文件或目录）不直接与事件相对应，但这些操作确实会引发事件。当复制文件或目录时，如果文件被复制到的目录正在受监视，系统将在该目录中引发 Created 事件。如果 FileSystemWatcher 的另一个实例正在监视从其中复制内容的目录，则不会引发事件。例如，创建两个 FileSystemWatcher 实例。FileSystemWatcher1 设置为监视“C:\My Documents”，而 FileSystemWatcher2 设置为监视“C:\Your Documents”。如果将文件从“My Documents”复制到“Your Documents”中，则 FileSystemWatcher2 将引发 Created 事件，但 FileSystemWatcher1 不会引发任何事件。与复制不同，移动文件或目录将引发两个事件。在前面的示例中，如果将文件从“My Documents”移动到“Your Documents”，则 FileSystemWatcher2 将引发 Created 事件，FileSystemWatcher1 将引发 Deleted 事件。
提示
公共文件系统操作可能会引发多个事件。例如，将文件从一个目录移到另一个目录时，可能会引发若干 OnChanged 以及一些 OnCreated 和 OnDeleted 事件。移动文件是一个包含多个简单操作的复杂操作，因此会引发多个事件。同样，有些应用程序（例如，防病毒软件）可能会导致可由 FileSystemWatcher 检测到的其他文件系统事件。
示例
Public Class Watcher
Public Shared Sub Main()
Run()
End Sub
<PermissionSet(SecurityAction.Demand, Name:="FullTrust")> _
Private Shared Sub Run
Dim args() As String = System.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.
Dim 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 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: {0} renamed to {1}", e.OldFullPath, e.FullPath)
End Sub
End Class
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);
}
}
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' )
;
}
};
int main() {
Watcher::run();
}
public class Watcher
{
public static void main(String[] args1)
{
Run();
}
/** @attribute 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.set_Path(args[1]);
/* Watch for changes in LastAccess and LastWrite times, and
the renaming of files or directories.
*/
watcher.set_NotifyFilter
(NotifyFilters.LastAccess |NotifyFilters.LastWrite |
NotifyFilters.FileName | NotifyFilters.DirectoryName);
// Only watch text files.
watcher.set_Filter("*.txt");
// Add event handlers.
watcher.add_Changed(new FileSystemEventHandler(OnChanged));
watcher.add_Created(new FileSystemEventHandler(OnChanged));
watcher.add_Deleted(new FileSystemEventHandler(OnChanged));
watcher.add_Renamed(new RenamedEventHandler(OnRenamed));
// Begin watching.
watcher.set_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.get_FullPath() + " "
+ e.get_ChangeType()));
} //OnChanged
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.get_OldFullPath(),e.get_FullPath());
} //OnRenamed
} //Watcher
平台
Windows 98、Windows 2000 SP4、Windows Server 2003、Windows XP Media Center Edition、Windows XP Professional x64 Edition、Windows XP SP2、Windows XP Starter Edition
.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表，请参见系统要求。
版本信息
.NET Framework
受以下版本支持：2.0、1.1、1.0
请参见
参考
FileSystemWatcher 类
FileSystemWatcher 成员
System.IO 命名空间
FileSystemWatcher.Created 事件
OnCreated
FileSystemEventArgs 类
FileSystemEventHandler 委托
OnDeleted