Question

所以我有这段代码

public void Update_Click(object sender, EventArgs e)
{
    using (PccBiometricsHandler.Form1 ShowProgress = new PccBiometricsHandler.Form1())
    {
        menu.Items[2].Enabled = false;
        ShowProgress.ShowDialog();
        ShowProgress.FormClosed += new FormClosedEventHandler(MyForm_FormClosed);
    }
}

public void MyForm_FormClosed(object sender, FormClosedEventArgs e)
{
    updaterAccess();
    menu.Items[2].Enabled = true;
}

所以在我点击Update后，它将运行子表单Form1 这就是：

private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
    notifyIcon1.Visible = true;
    notifyIcon1.BalloonTipTitle = "Update Complete";
    notifyIcon1.BalloonTipText = "Successfully Update";
    notifyIcon1.ShowBalloonTip(500);
    timer1.Interval = 4000;
    timer1.Enabled = true;
    timer1.Tick += new EventHandler(timer1_Tick);
    timer1.Start(); 
}

private void timer1_Tick(object sender, EventArgs e)
{
    notifyIcon1.Dispose();
    this.Close();
}

因此您可以看到它在具有计时器的后台工作程序上运行以关闭子Form1

现在我的问题是，在关闭Child Form1后，它不会运行MyForm_FormClosed，它应该再次启用menu.Items [2]并且updaterAccess（）

我想我在mainForm中遗漏了一些东西

Answer 1

在触发ShowDialog

之前附加事件处理程序

public void Update_Click(object sender, EventArgs e)
    {
        using (PccBiometricsHandler.Form1 ShowProgress = new PccBiometricsHandler.Form1())
        {
            menu.Items[2].Enabled = false;
            ShowProgress.FormClosed += new FormClosedEventHandler(MyForm_FormClosed); //Attached the event handler before firing ShowDialog
            ShowProgress.ShowDialog();
        }
    }

Answer 2

ShowDialog同步显示模式对话框，这意味着它会一直阻塞，直到表单关闭（以下代码在表单关闭之前不会运行）。因此，当ShowDialog返回表单时已经关闭。

你可以在@Jade建议调用ShowDialog()之前附加事件处理程序，这将起作用，但老实说你根本不需要使用事件系统。只需等待ShowDialog返回，然后执行表单关闭时的操作：

public void Update_Click(object sender, EventArgs e)
{
    using (PccBiometricsHandler.Form1 ShowProgress = new PccBiometricsHandler.Form1())
    {
        menu.Items[2].Enabled = false;
        ShowProgress.ShowDialog();
    }

    updaterAccess();
    menu.Items[2].Enabled = true;
}

Answer 3

如果你想在VB中这样做：

AddHandler ShowProgress.FormClosed, AddressOf MyForm_FormClosed

在子窗体关闭后运行代码

3 个答案: