在Windows窗体中单击"关闭"按钮时的事件处理程序

Question

如果用户单击窗体中的关闭按钮,我想知道是否有任何事件处理程序.我最初的计划是当用户点击关闭按钮时,它会向调用者或调用该表单的人返回一个布尔值.例如

public void newWindow(){

      NewForm nw = new NewForm();
      nw.ShowDialog();
      if(nw.isClosed){
       do something
   }

}

那可能吗？

Answer 1

如果您使用.ShowDialog(),则可以通过DialogResult属性获取结果.

public void newWindow()
{
    Form1 nw = new Form1();
    DialogResult result = nw.ShowDialog();
    //do something after the dialog closed...
}

然后在Form1上的单击事件处理程序中:

private void buttonOk_Click(object sender, EventArgs e)
{
     this.DialogResult = DialogResult.OK;
}

private void buttonCancel_Click(object sender, EventArgs e)
{
     this.DialogResult = DialogResult.Cancel;
}

如果您不想将新表单作为对话框打开,则可以执行以下操作:

public void newWindow()
{
    Form2 nw = new Form2();
    nw.FormClosed += nw_FormClosed;
    nw.Show();
}

void nw_FormClosed(object sender, FormClosedEventArgs e)
{
    var form = sender as Form2;

    form.FormClosed -= nw_FormClosed; //unhook the event handler

    //you can still retrieve the DialogResult if you want it...
    DialogResult result = form.DialogResult;
    //do something
}