点击“是”当退出winform C＃时加倍？ [英] Click "yes" double when exit winform C#?

问题描述

你好

我创建了一个退出winform C＃的代码，但是我必须在消息框中点击是两次。它有什么问题？

这是我的代码：

Hello
I make a code to exit winform C#, it works but I must click "yes" in messagebox twice. What wrong with it?
Here is my code:

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            DialogResult result = MessageBox.Show("Sure?", "Exit", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
            if (result == DialogResult.Yes)
            {
                Application.Exit();
            }
            else
            {
                e.Cancel = true;
            }
        }

推荐答案

试试这样：

Try it like this :

Protected Overrides Sub OnFormClosing(e As System.Windows.Forms.FormClosingEventArgs)
     Dim myResult As DialogResult = MessageBox.Show(Me, "FormClosing-Message", "Caption-Text", MessageBoxButtons.YesNo)

     If myResult = Windows.Forms.DialogResult.No Then
         e.Cancel = True
     End If
     MyBase.OnFormClosing(e)
 End Sub

我不使用Event而是使用Event-calling-Method。

当DialogResult为是时你不需要做任何事 - 这是正常情况......



和额外的C＃代码：

I don't use the Event but the Event-calling-Method.
You don't Need to do anything when DialogResult is "Yes" - it is the normal case ...

and additional as C#-Code :

protected override void OnFormClosing(System.Windows.Forms.FormClosingEventArgs e)
{
	DialogResult myResult = MessageBox.Show(this, "FormClosing-Message", "Caption-Text", MessageBoxButtons.YesNo);

	if (myResult == Windows.Forms.DialogResult.No) {
		e.Cancel = true;
	}
	base.OnFormClosing(e);
}

Hi
为该表单创建对象，使用obj u可以关闭表单。而不是使用Application.Exit使用close。

Hi Create object for that form,using obj u can close form.Instead of using Application.Exit use close.

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
    {
        DialogResult result = MessageBox.Show("Sure?", "Exit", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
        if (result == DialogResult.Yes)
        {
             Form1 ff= new Form1() ;
             ff.Close ();

        }
        else
        {
            e.Cancel = true;
        }
    }

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