如何检测表单何时从另一个仍然打开的表单关闭？

Question

我只是想知道如何检测表单何时从另一个表单关闭，假设我让我的主客户端打开另一个名为发件人的表单，我将如何检测发件人表单何时从主客户端表单关闭？

Answer 1

Attach an event handler to the form's closing event.

This will allow you to do whatever it is you want to do when the form closes.

Answer 2

You can attach, from the "ANOTHER FORM", an event handler to the FormClosing event

form.FormClosing += (sender, eventArgs) =>
{
    //Do your magic here
};

There is also a System.Windows.Forms.Forms.Closing event but it has been deprecated since .NET 2.0

Answer 3

It can be done easier than with an event:

if (!otherForm.IsDisposed)
{
    // otherForm is still open
}