FileSystemWatcher - 削除時にファイルをコピーする

Question

質問があります。フォルダを監視するFileWatcherを作成しています。削除したファイルを別の場所からコピーするメソッドを作成しようとしています。

これは、FileSystemEventHandlerを使用すると可能ですか？

最後に、FileSystemWatcherを使用してフォルダを変更することはできますか？

ありがとうございました。

あなたのコードは次の線に沿って何かする必要があります

Answer 1

：

using System.IO; 

//... 

const string SourceDirectory = @"\\myServer\share\originalFiles"; 
private static void OnDeleted (object source, FileSystemEventArgs e) 
{ 

    //this will help prove if the fsw is being triggered/whether the error's in your copy file piece or due to the trigger not firing 
    Debug.WriteLine(e.FullPath); 
    Debug.WriteLine(e.ChangeType); 

    var filename = e.Name; //NB: Returns path relative to the monitored folder; e.g. if monitoring "c:\demo" and file "c:\demo\something\file.txt" is changed, would return "something\file.txt" 
    //var filename = Path.GetFilename(e.FullPath); //if you don't want the above behaviour, given the same scenario this would return "file.txt" instead 
    var sourceFilename = Path.Combine(SourceDirectory, filename); 

    /* not sure if this is required: see https://github.com/Microsoft/dotnet/issues/437 
    while (File.Exists(e.FullPath)) { //just in case the delete operation is still in progress when this code's triggered. 
     Threading.Thread.Sleep(500); 
    } 
    */ 

    File.Copy(sourceFilename, e.FullPath); 
} 

//... 

const string MonitoredDirectory = @"\\myServer\share\watchedFiles\"; 
public static void Main(string[] args) { 
    FileSystemWatcher fsw = new FileSystemWatcher(); 
    fsw.Path = MonitoredDirectory; 
    fsw.NotifyFilter = NotifyFilters.LastAccess | NotifyFilters.LastWrite | NotifyFilters.FileName | NotifyFilters.DirectoryName; 
    //fsw.Filter = "*.xml"; //add something like this if you want to filter on certain file extensions/that sort of thing 
    fsw.OnDeleted += new FileSystemEventHandler(OnDeleted); 
    fsw.EnableRaisingEvents = true; 
    Console.WriteLine("This monitor will now run until you press 'x' (i.e. as we need to keep the program running to keep the fsw in operation)"); 
    while(Console.Read() != 'x'); 
} 

（上記未テストです）