FormClosing 委托无法与 ShowDialog() 方法一起使用

发布于 2024-11-05 11:29:19 字数 313 浏览 0 评论 0 原文

在我的 C# WinForms 程序中，我有一些表单，我将其中一个显示为对话框：

MyForm mf = new MyForm();
mf.ShowDialog();

但是当我尝试为它们分配表单关闭事件时，它不起作用；

mf.FormClosing += delegate { MessageBox.Show("Dialog is closed.")};

问题是什么？

PS：当我使用 mf.Show() 方法调用表单时，它工作正常。

谢谢。

原文

In my C# WinForms program I have some forms and I show one of them as a dialog:

MyForm mf = new MyForm();
mf.ShowDialog();

But when I try to assigne a form closing event for them, it is not working;

mf.FormClosing += delegate { MessageBox.Show("Dialog is closed.")};

What is the problem?

P.S: It works fine when I call the form using mf.Show() method.

Thanks.

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大姐，你呐 2024-11-12 11:29:19

“不工作”是极其含糊的。您的代码片段中缺少一个分号。不得不猜测，不要在调用 ShowDialog() 之后分配 FormClosing 事件，那样就太晚了。这工作正常：

    private void button1_Click(object sender, EventArgs e) {
        using (var mf = new Form2()) {
            mf.FormClosing += delegate { MessageBox.Show("Dialog is closed."); };
            mf.ShowDialog();
        }
    }

"Not working" is hopelessly ambiguous. There's a semi-colon missing in your snippet. Having to guess, don't assign the FormClosing event after calling ShowDialog(), that's too late. This works fine:

    private void button1_Click(object sender, EventArgs e) {
        using (var mf = new Form2()) {
            mf.FormClosing += delegate { MessageBox.Show("Dialog is closed."); };
            mf.ShowDialog();
        }
    }

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那支青花 2024-11-12 11:29:19

你使用的顺序是什么？首先你必须注册事件，然后调用 mf.ShowDialog()。

MyForm mf = new MyForm();
mf.FormClosing += delegate { MessageBox.Show("Dialog is closed.")};
mf.ShowDialog();

您在 MessageBox 中写入“对话框已关闭”，但您注册到 FormClosing。请注意，有一个 FormClosed 和一个 FormClosing 事件。这是不同的事件。

What is the sequence you use? First you have to register the event, then call mf.ShowDialog().

MyForm mf = new MyForm();
mf.FormClosing += delegate { MessageBox.Show("Dialog is closed.")};
mf.ShowDialog();

You write in the MessageBox "Dialog is closed", but you register to FormClosing. Please note, that there is a FormClosed and a FormClosing-event. This are different events.