FileSystemWatcher事件未触发

时间:2014-05-22 21:58:03

标签: c# winforms filesystemwatcher

我的FileSystemWatcher没有抛出任何事件。我看过这些类似的问题,似乎都没有解决我的问题:

*编辑:我的目标是捕获何时将XLS文件复制到目录中或在目录中创建。

监控类:

public class Monitor
{
    FileSystemWatcher watcher = new FileSystemWatcher();
    readonly string bookedPath = @"\\SomeServer\SomeFolder\";

    public delegate void FileDroppedEvent(string FullPath);
    public event FileDroppedEvent FileDropped;

    public delegate void ErrorEvent(Exception ex);
    public event ErrorEvent Error;

    public Monitor()
    {
        watcher.Path = bookedPath;
        watcher.Filter = "*.xls";
        watcher.NotifyFilter = NotifyFilters.LastWrite;
        watcher.Changed += new FileSystemEventHandler(watcher_Changed);
        watcher.Error += new ErrorEventHandler(watcher_Error);
    }

    void watcher_Error(object sender, ErrorEventArgs e)
    {
        Error(e.GetException());
    }

    void watcher_Changed(object sender, FileSystemEventArgs e)
    {
        if (e.ChangeType != WatcherChangeTypes.Created) return;
        FileDropped(e.FullPath);
    }

    public void Start()
    {
        watcher.EnableRaisingEvents = true;
    }

    public void Stop()
    {
        watcher.EnableRaisingEvents = false;
    }
}

使用Listbox的简单表单:

public partial class Form1 : Form
{
    Monitor monitor = new Monitor();

    public Form1()
    {
        InitializeComponent();
        FormClosing += new FormClosingEventHandler(Form1_FormClosing);
        Load += new EventHandler(Form1_Load);
        monitor.FileDropped += new Monitor.FileDroppedEvent(monitor_FileDropped);
        monitor.Error += new Monitor.ErrorEvent(monitor_Error);
    }

    void Form1_Load(object sender, EventArgs e)
    {
        monitor.Start();
    }

    void Form1_FormClosing(object sender, FormClosingEventArgs e)
    {
        monitor.Stop();
    }

    void monitor_Error(Exception ex)
    {
        listBox1.Items.Add(ex.Message);
    }

    void monitor_FileDropped(string FullPath)
    {
        listBox1.Items.Add(FullPath);
    }
}

我做错了什么?

4 个答案:

答案 0 :(得分:2)

试一试。对我来说非常类似的任务。

watcher.NotifyFilter = NotifyFilters.FileName;   
watcher.Created += new FileSystemEventHandler(handler);     
watcher.Renamed += new RenamedEventHandler(handler);

答案 1 :(得分:0)

这可能是因为文件元数据尚未更新。如果您不断写入文件,可能会发生这种情况。

答案 2 :(得分:0)

您是否尝试过以下操作:

{{1}}

答案 3 :(得分:-1)

您的问题与过滤器以及我认为的事件有关。 NotifyFilters.LastAccess仅在文件打开时触发。尝试使用:

NotifyFilters.LastWrite | NotifyFilters.CreationTime

这将监视已写入/创建的文件。接下来,连接到Created委托以处理新创建的文件:

watcher.Created += YourDelegateToHandleCreatedFiles

FileSystemWatcher的工作方式是首先使用NotifyFilters来限制事件触发器。然后,您使用实际事件来完成工作。通过挂钩Created事件,您只能在创建文件时才能工作。