WatcherChangeTypes 枚举

定义

命名空间:

System.IO

程序集:

System.IO.FileSystem.Watcher.dll

可能会发生的文件或目录的更改。

此枚举支持其成员值的按位组合。

C#

[System.Flags]
public enum WatcherChangeTypes

继承

Object

ValueType

Enum

WatcherChangeTypes

属性

FlagsAttribute

字段

名称	值	说明
All	15	文件或文件夹的创建、删除、更改或重命名。
Changed	4	文件或文件夹的更改。 更改的类型包括：大小、属性、安全设置、最近写入时间和最近访问时间方面的更改。
Created	1	文件或文件夹的创建。
Deleted	2	文件或文件夹的删除。
Renamed	8	文件或文件夹的重命名。

示例

以下示例演示如何创建 FileSystemWatcher，以监视磁盘驱动器上发生的文件更改 (创建、删除、重命名、更改) 。 该示例还演示如何正确接收错误通知。

C#

using System;
using System.IO;

class Program
{
    static void Main(string[] args)
    {
        //  Create a FileSystemWatcher to monitor all files on drive C.
        FileSystemWatcher fsw = new FileSystemWatcher("C:\\");

        //  Watch for changes in LastAccess and LastWrite times, and
        //  the renaming of files or directories.
        fsw.NotifyFilter = NotifyFilters.LastAccess | NotifyFilters.LastWrite
            | NotifyFilters.FileName |NotifyFilters.DirectoryName;

        //  Register a handler that gets called when a
        //  file is created, changed, or deleted.
        fsw.Changed += new FileSystemEventHandler(OnChanged);

        fsw.Created += new FileSystemEventHandler(OnChanged);

        fsw.Deleted += new FileSystemEventHandler(OnChanged);

        //  Register a handler that gets called when a file is renamed.
        fsw.Renamed += new RenamedEventHandler(OnRenamed);

        //  Register a handler that gets called if the
        //  FileSystemWatcher needs to report an error.
        fsw.Error += new ErrorEventHandler(OnError);

        //  Begin watching.
        fsw.EnableRaisingEvents = true;

        Console.WriteLine("Press \'Enter\' to quit the sample.");
        Console.ReadLine();
    }

    //  This method is called when a file is created, changed, or deleted.
    private static void OnChanged(object source, FileSystemEventArgs e)
    {
        //  Show that a file has been created, changed, or deleted.
        WatcherChangeTypes wct = e.ChangeType;
        Console.WriteLine("File {0} {1}", e.FullPath, wct.ToString());
    }

    //  This method is called when a file is renamed.
    private static void OnRenamed(object source, RenamedEventArgs e)
    {
        //  Show that a file has been renamed.
        WatcherChangeTypes wct = e.ChangeType;
        Console.WriteLine("File {0} {2} to {1}", e.OldFullPath, e.FullPath, wct.ToString());
    }

    //  This method is called when the FileSystemWatcher detects an error.
    private static void OnError(object source, ErrorEventArgs e)
    {
        //  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 (e.GetException().GetType() == typeof(InternalBufferOverflowException))
        {
            //  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));
        }
    }
}

注解

每个成员都 WatcherChangeTypes 与 中的 FileSystemWatcher事件相关联。 有关事件的详细信息，请参阅 Created、 Deleted、 Changed和 Renamed。

适用于

另请参阅

• Changed
• Created
• Deleted
• FileSystemEventArgs
• FileSystemEventHandler
• FileSystemWatcher
• InternalBufferOverflowException
• NotifyFilters
• Renamed
• RenamedEventArgs
• RenamedEventHandler
• WaitForChangedResult