WatcherChangeTypes 列挙体とは? わかりやすく解説

WatcherChangeTypes 列挙体

ファイルまたはディレクトリ発生する可能性がある変更

この列挙体には、メンバ値のビットごとの組み合わせ可能にする FlagsAttribute 属性含まれています。

名前空間: System.IO
アセンブリ: System (system.dll 内)
構文構文

<FlagsAttribute> _
Public Enumeration WatcherChangeTypes
Dim instance As WatcherChangeTypes
[FlagsAttribute] 
public enum WatcherChangeTypes
[FlagsAttribute] 
public enum class WatcherChangeTypes
/** @attribute FlagsAttribute() */ 
public enum WatcherChangeTypes
FlagsAttribute 
public enum WatcherChangeTypes
メンバメンバ
解説解説

WatcherChangeTypes メンバは、FileSystemWatcher のイベント関連付けられます。イベント詳細については、CreatedDeletedChanged、Renamed の各トピック参照してください

使用例使用例

FileSystemWatcher を作成しディスク ドライブ上でファイル変更 (作成削除、名前変更変更) を監視する方法次の例に示します。この例では、エラー通知正しく受け取方法示されています。

Imports System.IO

Module Module1
    Sub Main()
        ' Create a FileSystemWatcher to monitor all files on drive C.
        Dim fsw As New FileSystemWatcher("C:\")

        ' Watch for changes in LastAccess and LastWrite times, and
        ' the renaming of files or directories. 
        fsw.NotifyFilter = (NotifyFilters.LastAccess Or NotifyFilters.LastWrite
 _ 
            Or NotifyFilters.FileName Or NotifyFilters.DirectoryName)

        ' Register a handler that gets called when a 
        ' file is created, changed, or deleted.
        AddHandler fsw.Changed, New FileSystemEventHandler(AddressOf
 OnChanged)

        ' The commented line of code below is a shorthand of the above
 line.
        ' AddHandler fsw.Changed, AddressOf OnChanged

        ' NOTE: The shorthand version is used in the remainder of this
 code.
        ' FileSystemEventHandler
        AddHandler fsw.Created, AddressOf OnChanged
 
        ' FileSystemEventHandler
        AddHandler fsw.Deleted, AddressOf OnChanged

        ' Register a handler that gets called when a file is renamed.
        ' RenamedEventHandler
        AddHandler fsw.Renamed, AddressOf OnRenamed

        ' Register a handler that gets called if the 
        ' FileSystemWatcher needs to report an error.
        ' ErrorEventHandler
        AddHandler fsw.Error, AddressOf OnError

        ' Begin watching.
        fsw.EnableRaisingEvents = True

        ' Wait for the user to quit the program.
        Console.WriteLine("Press 'Enter' to quit the sample.")
        Console.ReadLine()
    End Sub

    ' This method is called when a file is created, changed, or deleted.
    Private Sub OnChanged(ByVal
 source As Object, ByVal
 e As FileSystemEventArgs)

        ' Show that a file has been created, changed, or deleted.
        Dim wct As WatcherChangeTypes = e.ChangeType
        Console.WriteLine("File {0} {1}", e.FullPath,
 wct.ToString())
    End Sub

    ' This method is called when a file is renamed.
    Private Sub OnRenamed(ByVal
 source As Object, ByVal
 e As RenamedEventArgs)

        ' Show that a file has been renamed.
        Dim wct As WatcherChangeTypes = e.ChangeType
        Console.WriteLine("File {0} {2} to {1}", e.OldFullPath,
 e.FullPath, wct.ToString())
    End Sub

    ' This method is called when the FileSystemWatcher detects an error.
    Private Sub OnError(ByVal
 source As Object, ByVal
 e As ErrorEventArgs)

        ' Show that an error has been detected.
        Console.WriteLine("The FileSystemWatcher has detected
 an error")

        ' Give more information if the error is due to an internal buffer
 overflow.
        If TypeOf e.GetException Is
 InternalBufferOverflowException Then
            ' This can happen if Windows is reporting many file system
 events quickly 
            ' and internal buffer of the  FileSystemWatcher is not large
 enough to handle this
            ' rate of events. The InternalBufferOverflowException error
 informs the application
            ' that some of the file system events are being lost.
            Console.WriteLine( _
                "The file system watcher experienced an internal
 buffer overflow: " _
                + e.GetException.Message)
        End If
    End Sub
End Module
プラットフォームプラットフォーム
バージョン情報バージョン情報
参照参照
関連項目
System.IO 名前空間
FileSystemWatcher.Changed イベント
FileSystemWatcher.Created イベント
FileSystemWatcher.Deleted イベント
FileSystemEventArgs クラス
FileSystemEventHandler デリゲート
FileSystemWatcher クラス
InternalBufferOverflowException クラス
NotifyFilters 列挙
FileSystemWatcher.Renamed イベント
RenamedEventArgs クラス
RenamedEventHandler デリゲート
WaitForChangedResult 構造体



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