你可以向c＃监视器添加一个对象吗？ [英] Can you add an object to a c# watcher?

问题描述

当我创建一个观察者，我想添加一个对象，我可以在观察者watcher_Created事件期间读取？

When i create a watcher i want to add an object to it that i can read during the watchers watcher_Created event?

推荐答案

你可以在一个匿名委托中捕获它：

You can just capture it in an anonymous delegate:

object o;
var watcher = new FileSystemWatcher();
watcher.Created += (sender, e) => { 
    Console.WriteLine(o);
    // handle created event
};

这里， o 表示你想要捕获（不必输入对象）。

Here, o represents the object that you want to capture (it doesn't have to be typed as object).

请注意，这实际上是相同于

Note that this is effectively the same as

class Foo {
    private readonly object o;
    public Foo(object o) {
        this.o = o;
    }

    public void OnCreated(object sender, FileSystemEventArgs e) {
        Console.WriteLine(this.o);
        // handle event
    }
}

object o = null;
Foo foo = new Foo(o);
var watcher = new FileSystemWatcher();
watcher.Created += foo.OnCreated;

但是我们让编译器为我们做了工作。有微妙的区别。

but we have let the compiler do the work for us. There are subtle differences.

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