FileSystemEventHandler的其他参数

Question

我正在尝试编写一个程序,可以监视多个文件夹以进行文件创建,并启动相同的操作,但每个文件夹的设置不同.我的问题是为FileSystemEventHandler指定一个额外的参数.我为每个目录创建一个新的FileWatcher来监视并添加Created-action的处理程序:

foreach (String config in configs)
{
    ...
    FileWatcher.Created += new System.IO.FileSystemEventHandler(FileSystemWatcherCreated)
    ...
}

void FileSystemWatcherCreated(object sender, System.IO.FileSystemEventArgs e, MySettings mSettings)
{
    DoSomething(e.FullPath, mSettings);
}

我怎样才能将'mSettings'变量传递给FileSystemWatcherCreated()？

Answer 1

foreach (String config in configs)
{
    ...
    FileWatcher.Created += (s,e) => DoSomething(e.FullPath, mSettings);
    ...
}

Answer 2

foreach (String config in configs) 
{ 
    ... 
    MySettings mSettings = new MySettings(...); // create a new instance, don't modify an existing one
    var handler = new System.IO.FileSystemEventHandler( (s,e) => FileSystemWatcherCreated(s,e,msettings) );
    FileWatcher.Created += handler;
    // store handler somewhere, so you can later unsubscribe
    ... 
} 

void FileSystemWatcherCreated(object sender, System.IO.FileSystemEventArgs e, MySettings mSettings) 
{ 
    DoSomething(e.FullPath, mSettings); 
}