Question

我的表单包含一个名为button的{{1}}。我只是将下面的代码放在关闭按钮中，单击...然后第二个代码集用于表单关闭。但是，如果我在单击close close时执行此操作，则会出现button。当我单击“是” 按钮时，该表单没有关闭，但是如果我第二次单击“是” 按钮，则该表单将关闭。关闭。是什么原因？你能帮我吗？

MessageBox

Answer 1

请勿关闭/退出Application，而是关闭Form：

private void btnClose_Click(object sender, EventArgs e) {
  // On btnClose button click all we should do is to Close the form
  Close();
}

private void frminventory_FormClosing(object sender, FormClosingEventArgs e) {
  // If it's a user who is closing the form...
  if (e.CloseReason == CloseReason.UserClosing) {
    // ...warn him/her and cancel form closing if necessary
    e.Cancel = MessageBox.Show("Are You Sure You Want To Close This Form?", 
                               "Close Application", 
                                MessageBoxButtons.YesNo) != DialogResult.Yes;
  }
}

编辑：通常，我们向用户询问直接问题（不清楚如果我只是表格” ），例如

private void frminventory_FormClosing(object sender, FormClosingEventArgs e) {
  // Data has not been changed, just close without pesky questions
  if (!isEdited)
    return;

  // If it's a user who is closing the form...
  if (e.CloseReason == CloseReason.UserClosing) {
    var action = MessageBox.Show(
      "You've edited the data, do you want to save it?"
       Text, // Let user know which form asks her/him
       MessageBoxButtons.YesNoCancel);

    if (DialogResult.Yes == action)
      Save(); // "Yes" - save the data edited and close the form
    else if (DialogResult.No == action)
      ;       // "No"  - discard the edit and close the form
    else
      e.Cancel = true; // "Cancel" - do not close the form (keep on editing) 
  }
}

Answer 2

所以，因为我无法发表评论，所以我会做这样的事情。

    //Create this variable
    private bool _saved = true;
    public Form1()
    {
        InitializeComponent();
    }

    private void btnSave_Click(object sender, EventArgs e)
    {
        DoSomething();
        _saved = true;
    }

    //Raised when the text is changed. I just put this for demonstration purpose.
    private void textBox1_TextChanged(object sender, EventArgs e)
    {
        _saved = false;
    }

    private void btnClose_Click(object sender, EventArgs e)
    {
        Close();
    }

    private void Form1_FormClosing(object sender, FormClosingEventArgs e)
    {
        if (_saved == false)
        {
            var result = MessageBox.Show("Are you sure you want to close?\nYou may have unsaved information", "Information", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Information);
            if (result == DialogResult.Yes)
            {
                _saved = true;
                Application.Exit();
            }
            else
                e.Cancel = true;
        }
    }

希望这可以解决您的问题

关闭按钮无法正确关闭表单

2 个答案: