c# - Form.Owner - 拥有的表单不递归关闭/隐藏

Question

MSDN documentation状态:

When a form is owned by another form, it is closed or hidden with the owner form. For example, consider a form named Form2 that is owned by a form named Form1. If Form1 is closed or minimized, Form2 is also closed or hidden.

显然隐藏不是递归工作的？当我有一堆 4 个彼此为父级的表单时(GrandChildForm.Owner = Child; ChildForm.Owner = ParentForm; 等)，最小化其中任何一个只会最小化它的直接子级。

关闭这些窗体之一时的类似效果，仅引发直接子级的 FormClosing/Closed 事件，但不会引发其他访问器。 Again the docs不要说这不能递归工作:

If a form has any child or owned forms, a FormClosing event is also raised for each one. If any one of the forms cancels the event, none of the forms are closed.

我要实现的目标:

• 最小化/恢复表单也应该最小化/恢复它的所有祖先。
• 关闭表单应该沿着表单层次一直向下到“最小的”子级，如果他们中的任何一个决定不关闭 (FormClosingEventArgs.Cancel = true;) 那么交易是关闭。

这应该使用额外的事件处理来实现(订阅所有者的 FormClosing/FormClosed/SizeChanged 事件)还是我在这里遗漏了什么？

Answer 1

你可以从这个类继承你的表单:

public class AdvancedForm : Form
{
    protected override void OnFormClosing(FormClosingEventArgs e)
    {
        foreach (Form f in this.OwnedForms)
        {
            f.Close();
        }

        base.OnFormClosing(e);
    }

    protected override void OnSizeChanged(EventArgs e)
    {
        base.OnSizeChanged(e);

        foreach (AdvancedForm f in this.OwnedForms)
        {
            switch (this.WindowState)
            {
                case FormWindowState.Minimized:
                case FormWindowState.Normal:
                    f.WindowState = this.WindowState;
                    break;

                case FormWindowState.Maximized:
                    // just restore owned forms to their original sizes when parent form is maximized
                    f.WindowState = FormWindowState.Normal;
                    break;
            }

            // OnSizeChanged must be called, as changing WindowState property
            // does not raise SizeChanged event
            f.OnSizeChanged(EventArgs.Empty);
        }

    }
}

或者只在“Closing”和“SizeChanged”事件处理程序中使用此类中的代码。