windows - FileSystemWatcher的NotifyFilter不起作用

我有一个Windows服务(并通过创建类似的WinForms应用程序验证了代码)，其中NotifyFilter不起作用。删除该行代码后，该服务将正常运行，并且可以在WinForms应用程序中看到事件处理程序启动。

我正在做的就是将文本文件拖放到FileSystemWatcher的输入目录中，以启动watcher_FileChanged委托(delegate)。当我在其中放入_watcher.NotifyFilter = NotifyFilters.CreationTime;时，它不起作用。当我将其拔出时，它可以正常工作。

谁能告诉我此过滤器是否做错了什么？

这是OnStart事件的FSW代码。

protected override void OnStart(string[] args)
{
    _watcher = new FileSystemWatcher(@"C:\Projects\Data\Test1");

    _watcher.Created += new FileSystemEventHandler(watcher_FileChanged);
    _watcher.NotifyFilter = NotifyFilters.CreationTime;
    _watcher.IncludeSubdirectories = false;
    _watcher.EnableRaisingEvents = true;
    _watcher.Error += new ErrorEventHandler(OnError);
}

private void watcher_FileChanged(object sender, FileSystemEventArgs e)
{
    // Folder with new files - one or more files
    string folder = @"C:\Projects\Data\Test1";
    System.Console.WriteLine(@"C:\Projects\Data\Test1");
    //Console.ReadKey(true);

    // Folder to delete old files - one or more files
    string output = @"C:\Temp\Test1\";
    System.Console.WriteLine(@"C:\Temp\Test1\");
    //Console.ReadKey(true);

    // Create name to call new zip file by date
    string outputFilename = Path.Combine(output, string.Format("Archive{0}.zip", DateTime.Now.ToString("MMddyyyy")));
    System.Console.WriteLine(outputFilename);
    //Console.ReadKey(true);

    // Save new files into a zip file
    using (ZipFile zip = new ZipFile())
    {
        // Add all files in directory
        foreach (var file in Directory.GetFiles(folder))
        {
            zip.AddFile(file);
        }

        // Save to output filename
        zip.Save(outputFilename);
    }

    DirectoryInfo source = new DirectoryInfo(output);
    // Get info of each file into the output directory to see whether or not to delete
    foreach (FileInfo fi in source.GetFiles())
    {
        if (fi.CreationTime < DateTime.Now.AddDays(-1))
            fi.Delete();
    }
}

最佳答案

我也一直在这种行为的麻烦。如果您逐步执行代码(并且查看MSDN documenation，则会发现NotifyFilter开始时的默认值为:

NotifyFilters.FileName | NotifyFilters.DirectoryName | NotifyFilters.LastWrite

因此，当您说.NotifyFilter = NotifyFilters.CreationTime时，您要清除掉其他值，这可以解释行为上的差异。我不确定NotifyFilters.CreationTime为什么不捕获新文件...似乎应该，不应该!

如果适合您，则可以仅使用NotifyFilter的默认值。如果要添加NotifyFilters.CreationTime，建议您执行以下操作以添加新值，而不是替换现有值:

_watcher.NotifyFilter = _watcher.NotifyFilter | NotifyFilters.CreationTime;

关于windows - FileSystemWatcher的NotifyFilter不起作用，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/13708941/