WHY

Test.PS1

$dstDir  = 'E:\Test';    #待监视的目录
$timeout = 120;          #超时时间 120 秒
$watcher = New-Object System.IO.FileSystemWatcher($dstDir);
$watcher.IncludeSubdirectories = $true;

while(1) {
    Unregister-Event -SourceIdentifier 'MyFileWatcher' -ErrorAction SilentlyContinue;
    Remove-Event -SourceIdentifier 'MyFileWatcher' -ErrorAction SilentlyContinue;
    Register-ObjectEvent -Input $watcher -EventName Created -SourceIdentifier 'MyFileWatcher';
    $event = Wait-Event -SourceIdentifier 'MyFileWatcher' -Timeout $timeout;
    $file  = $event.SourceEventArgs.FullPath;
    if($file -eq $null) {
        &'C:\Program Files\Internet Explorer\iexplore.exe' #超时后运行其它程序
        break;   #退出监控
    }
}
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