如何显示一个MessageBox提示，当用户点击了跨在标题栏中 [英] How do I show a MessageBox prompt when the user has clicked the cross in the title bar

问题描述

我目前正在开发一个C＃Windows窗体应用程序。

I am currently developing a C# Windows Form Application.

用户通过登录表单登录后，它将被带到MainForm的。

After the user has login through the loginForm, it will be brought to the mainForm.

我想它的方式代码，用户点击之后在MainForm的标题栏在十字架上，会有一个提示，询问用户这将关闭应用程序。确认？
其次是yes和no按钮。

I would like to code it in a way that after the user click the cross on the title bar in the mainForm, there would be a prompt asking the user "This will close the application. Confirm?" followed by a yes and no button.

如果是，将显示另一个框，应用程序关闭！

If yes, another box will be displayed, "Application Closed!"

如果没有，在MessageBox只会关闭，应用程序将继续运行。

If no, the messagebox will just close and the application will continue running.

我当前的代码是：

private void mainForm_FormClosing(object sender, FormClosingEventArgs e)
{
    if (MessageBox.Show("This will close down the whole application. Confirm?", "Close Application", MessageBoxButtons.YesNo) == DialogResult.Yes)
    {
        MessageBox.Show("The application has been closed successfully.", "Application Closed!", MessageBoxButtons.OK);
        System.Windows.Forms.Application.Exit();
    }
    else
    {
        this.Activate();
    }   
}

但它不能正常工作。

however it does not work.

首先，我不知道为什么在MessageBox为了使整个事情关闭两次弹出。

Firstly I have no idea why the messagebox pops up twice in order for the whole thing to close.

其次，窗体关闭为好，我不能把它带回来。

Secondly if i click no, the form closes as well and I am not able to bring it back.

推荐答案

要取消形式的关闭，在你else语句需要 e.Cancel = TRUE; 。
你不需要在你的真实情况下的明确的退出。

To cancel the closing of the form, in your else statement you need e.Cancel = true;. You don't need the explicit Exit in your true case.

试试这个

private void mainForm_FormClosing(object sender, FormClosingEventArgs e)
{
    if (MessageBox.Show("This will close down the whole application. Confirm?", "Close Application", MessageBoxButtons.YesNo) == DialogResult.Yes)
    {
        MessageBox.Show("The application has been closed successfully.", "Application Closed!", MessageBoxButtons.OK);

    }
    else
    {
        e.Cancel = true;
        this.Activate();
    }   
}

我假设你的第二个MessageBox中说，它已关闭，如果仅用于测试目的。

I assume your second MessageBox to say it has closed if for testing purposes only.

您可能只需要。

private void mainForm_FormClosing(object sender, FormClosingEventArgs e)
{
    if (MessageBox.Show("This will close down the whole application. Confirm?", "Close Application", MessageBoxButtons.YesNo) != DialogResult.Yes)
    {
        e.Cancel = true;
    } 
}

注意语句检查，看看如果他们不打是，而不是，如果他们打取消。这意味着，如果他们打的X对话框上它不会被算作确认

Notice the statement checks to see if they didn't hit yes, rather than if they hit cancel. This means that if they hit the x on the dialog box it won't be counted as a confirmation.

编辑：如果MainForm中不是主要形式

好吧，我想我已经得到了你现在问。

Okay, I think I've got what you're asking now.

什么我会做的就是把我的代码在我的第二个代码块以上的的FormClosing，然后在FormClosed事件处理程序有这个

What I would do is put the code I have in my second code block above in the FormClosing, and then in the FormClosed event handler have this

private void mainForm_FormClosed(Object sender, FormClosedEventArgs e)
{
    MessageBox.Show("The application has been closed successfully.", "Application Closed!", MessageBoxButtons.OK);
    System.Windows.Forms.Application.Exit();
}

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