本文档已存档,并且将不进行维护。

FileSystemWatcher.Created 事件

当在指定 Path 中创建文件和目录时发生。

命名空间:System.IO
程序集:System(在 system.dll 中)

public event FileSystemEventHandler Created
/** @event */
public void add_Created (FileSystemEventHandler value)

/** @event */
public void remove_Created (FileSystemEventHandler value)

JScript 支持使用事件,但不支持进行新的声明。

某些常见操作(如复制或移动文件或目录)不直接与事件相对应,但这些操作确实会引发事件。当复制文件或目录时,如果文件被复制到的目录正在受监视,系统将在该目录中引发 Created 事件。如果 FileSystemWatcher 的另一个实例正在监视从其中复制内容的目录,则不会引发事件。例如,创建两个 FileSystemWatcher 实例。FileSystemWatcher1 设置为监视“C:\My Documents”,而 FileSystemWatcher2 设置为监视“C:\Your Documents”。如果将文件从“My Documents”复制到“Your Documents”中,则 FileSystemWatcher2 将引发 Created 事件,但 FileSystemWatcher1 不会引发任何事件。与复制不同,移动文件或目录将引发两个事件。在前面的示例中,如果将文件从“My Documents”移动到“Your Documents”,则 FileSystemWatcher2 将引发 Created 事件,FileSystemWatcher1 将引发 Deleted 事件。

Note注意

公共文件系统操作可能会引发多个事件。例如,将文件从一个目录移到另一个目录时,可能会引发若干 OnChanged 以及一些 OnCreatedOnDeleted 事件。移动文件是一个包含多个简单操作的复杂操作,因此会引发多个事件。同样,有些应用程序(例如,防病毒软件)可能会导致可由 FileSystemWatcher 检测到的其他文件系统事件。

public class Watcher
{

    public static void Main()
    {
	Run();

    }

    [PermissionSet(SecurityAction.Demand, Name="FullTrust")]
    public static void Run()
    {
        string[] args = System.Environment.GetCommandLineArgs();
 
        // If a directory is not specified, exit program.
        if(args.Length != 2)
        {
            // Display the proper way to call the program.
            Console.WriteLine("Usage: Watcher.exe (directory)");
            return;
        }

        // Create a new FileSystemWatcher and set its properties.
        FileSystemWatcher watcher = new FileSystemWatcher();
        watcher.Path = args[1];
        /* Watch for changes in LastAccess and LastWrite times, and 
           the renaming of files or directories. */
        watcher.NotifyFilter = NotifyFilters.LastAccess | NotifyFilters.LastWrite 
           | NotifyFilters.FileName | NotifyFilters.DirectoryName;
        // Only watch text files.
        watcher.Filter = "*.txt";

        // Add event handlers.
        watcher.Changed += new FileSystemEventHandler(OnChanged);
        watcher.Created += new FileSystemEventHandler(OnChanged);
        watcher.Deleted += new FileSystemEventHandler(OnChanged);
        watcher.Renamed += new RenamedEventHandler(OnRenamed);

        // Begin watching.
        watcher.EnableRaisingEvents = true;

        // Wait for the user to quit the program.
        Console.WriteLine("Press \'q\' to quit the sample.");
        while(Console.Read()!='q');
    }

    // Define the event handlers.
    private static void OnChanged(object source, FileSystemEventArgs e)
    {
        // Specify what is done when a file is changed, created, or deleted.
       Console.WriteLine("File: " +  e.FullPath + " " + e.ChangeType);
    }

    private static void OnRenamed(object source, RenamedEventArgs e)
    {
        // Specify what is done when a file is renamed.
        Console.WriteLine("File: {0} renamed to {1}", e.OldFullPath, e.FullPath);
    }
}


public class Watcher
{
    public static void main(String[] args1)
    {
	Run();
    } 

    /** @attribute PermissionSet(SecurityAction.Demand, Name="FullTrust")
     */
    public static void Run()
    {
        String args[] = System.Environment.GetCommandLineArgs();

        // If a directory is not specified, exit program.
        if (args.length != 2) {

            // Display the proper way to call the program.
            Console.WriteLine("Usage: Watcher.exe (directory)");
            return;
        }

        // Create a new FileSystemWatcher and set its properties.
        FileSystemWatcher watcher = new FileSystemWatcher();
        watcher.set_Path(args[1]);

        /* Watch for changes in LastAccess and LastWrite times, and 
           the renaming of files or directories.
         */
        watcher.set_NotifyFilter
            (NotifyFilters.LastAccess |NotifyFilters.LastWrite |
            NotifyFilters.FileName | NotifyFilters.DirectoryName);

        // Only watch text files.
        watcher.set_Filter("*.txt");

        // Add event handlers.
        watcher.add_Changed(new FileSystemEventHandler(OnChanged));
        watcher.add_Created(new FileSystemEventHandler(OnChanged));
        watcher.add_Deleted(new FileSystemEventHandler(OnChanged));
        watcher.add_Renamed(new RenamedEventHandler(OnRenamed));

        // Begin watching.
        watcher.set_EnableRaisingEvents(true);

        // Wait for the user to quit the program.
        Console.WriteLine("Press \'q\' to quit the sample.");
        while ((Console.Read() != 'q')) {

        }
    }

    // Define the event handlers.
    private static void OnChanged(Object source,FileSystemEventArgs e)
    {
        // Specify what is done when a file is changed, created, or deleted.
        Console.WriteLine(("File: " + e.get_FullPath() + " " 
            + e.get_ChangeType()));
    } //OnChanged

    private static void OnRenamed(Object source, RenamedEventArgs e)
    {
        // Specify what is done when a file is renamed.
        Console.WriteLine("File: {0} renamed to {1}",
            e.get_OldFullPath(),e.get_FullPath());
    } //OnRenamed
} //Watcher

Windows 98、Windows 2000 SP4、Windows Server 2003、Windows XP Media Center Edition、Windows XP Professional x64 Edition、Windows XP SP2、Windows XP Starter Edition

.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表,请参见系统要求

.NET Framework

受以下版本支持:2.0、1.1、1.0
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