Question

这是有关的法典:

    private void FormAccounting_FormClosing(object sender, FormClosingEventArgs e)
    {
        Properties.Settings.Default.FormAccountingLocation = this.Location;
        Properties.Settings.Default.Save();
        if (IsEditing)
        {
            MessageBox.Show("Please save or cancel open transactions before closing the accounting window.", "Open Transactions", MessageBoxButtons.OK, MessageBoxIcon.Information);
            e.Cancel = true;
        }
    }

我在<代码>e.Cancel = 是的;行文,以确保执行。

表格在点击Ok之后立即关闭。

这里指的是:

    private void buttonAccounts_Click(object sender, EventArgs e)
    {
        FormAccounting NewFormAccounting = new FormAccounting();
        NewFormAccounting.Show();
    }

Answer 1

安排形式密切活动有助于防止:

User closing the form
Application.Exit from exiting the application
Code from calling Form.Close on the form

但它没有努力防止:

User closing application s main form
Code calling Form.Dispose on the form
Code calling Form.Close on the application s main window

最后3起案件甚至不会引发非主要形式上的近似事件,因此形式消失,没有机会取消。也许你的申请使形式首先以前三种方式之一告终,这触发了事件,而后三种方式之一(或类似方式)则不会引发事件,迫使形式关闭。

Edit: Add this function to your form s code and it will allow you to review in the debugger what the call stack looks like when your window is getting closed so you can see what is actually causing it:

  protected override void DestroyHandle()
  {
     System.Diagnostics.Debugger.Break();
     base.DestroyHandle();
  }

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