处理它引用的对象后，事件会发生什么？

发布于 2024-11-30 06:19:09 字数 399 浏览 0 评论 0原文

如果我将某个对象的方法链接到委托，然后处理该对象，会发生什么？

像这样：

class Hunter
{
    public event Action Shoot;

    public execute()
    {
        Form formBabySeal = new Form();

        Shoot += formBabySeal.Close;

        formBabySeal.Show();
        formBabySeal.Close(); //Dispose Form

        if (Shoot != null)
        {
             Shoot(); //event is null?
        }
    }
}

原文

what happens if i link a method of some object to a delegate, and then dispose of the object?

Like this:

class Hunter
{
    public event Action Shoot;

    public execute()
    {
        Form formBabySeal = new Form();

        Shoot += formBabySeal.Close;

        formBabySeal.Show();
        formBabySeal.Close(); //Dispose Form

        if (Shoot != null)
        {
             Shoot(); //event is null?
        }
    }
}

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埖埖迣鎅 2024-12-07 06:19:10

formBabySeal 不只是因为您处置它而 null 。因此，formBabySeal.Close() 将被调用。

当查看调用的方法时，您的代码与此等效：

Form formBabySeal = new Form();

formBabySeal.Show();
formBabySeal.Close(); //Dispose Form
formBabySeal.Close();

这将关闭表单（第一次调用 Close），第二次调用不会执行任何操作，因为表单已经关闭。

然而，正如 Steve 在评论部分指出的那样，您的代码将引入内存泄漏，因为 Shoot 仍然保留对 formBabySealClose 方法的引用因此，只要 Hunter 类的实例处于活动状态，formBabySeal 就会保持活动状态。

formBabySeal is not null just because you dispose it. So, formBabySeal.Close() will be called.

Your code is equivalent to this when looking at what methods are called:

Form formBabySeal = new Form();

formBabySeal.Show();
formBabySeal.Close(); //Dispose Form
formBabySeal.Close();

This will close the form (first call to Close) and the second call won't do anything, because the form is already closed.

However, as Steve points out in the comment section, your code will introduce a memory leak, because Shoot still holds a reference to the Close method of formBabySeal and because of this formBabySeal will be kept alive as long as the instance of the class Hunter is alive.

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