Question

我的应用程序在c＃中关闭时出现问题。当我点击关闭按钮时，它会显示消息框的两倍或更多倍。我该怎么办？

private void home_FormClosed(object sender, FormClosedEventArgs e)
{
    DialogResult dialog = MessageBox.Show("Are you sure you want to really exit ? ", 
                            "Exit", 
                             MessageBoxButtons.YesNo, 
                             MessageBoxIcon.Question);
    if (dialog == DialogResult.Yes)
    {
        System.Windows.Forms.Application.Exit();
    }
    else if (dialog == DialogResult.No)
    {
        this.Show();
    }
}

Answer 1

使用Form1_FormClosing事件，也不要像这样使用Application.Exit()：

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
    var x = MessageBox.Show("Are you sure you want to really exit ? ", "Exit", MessageBoxButtons.YesNo, MessageBoxIcon.Question);

    if (x == DialogResult.No) 
    {
       e.Cancel = true;
    }
    else
    {
      e.Cancel = false;
    }
}

或者像这样：

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
   e.Cancel = MessageBox.Show("Are you sure you want to really exit ? ", "Exit", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.No;
}

Answer 2

您应该使用Form.FormClosing事件而不是FormClosed事件。在参数中，您找到一个字段e.Cancel。通过将此设置为false，您可以保持表单打开

Answer 3

您可以通过检查<suite name="Suite1" verbose="1" parallel="methods" thread-count="5" preserve-order="false"> <test name="Login" > <classes> <class name="testSuite.TestSet1" /> </classes> </test> <test name="Product Search"> <classes> <class name="testSuite.TestSet2"/> </classes> </test> </suite>事件中是否已调用Application.Exit()来避免多个提示：

FormClosing

Answer 4

改为使用表单结束事件。

    private void Form1_FormClosing(object sender, FormClosingEventArgs e)
    {
        var confirmation = MessageBox.Show("Sure to close form", "Confirm", MessageBoxButtons.YesNo);

        if (confirmation == System.Windows.Forms.DialogResult.No)
        {
             e.Cancel = true; //Even cancelled, form will not get closed now
        }
    }

形成近距离活动

4 个答案: