Welcome to ShenZhenJia Knowledge Sharing Community for programmer and developer-Open, Learning and Share
menu search
person
Welcome To Ask or Share your Answers For Others

Categories

This is .net WinForm question about MDI setting.

When the main form creates an MDI child form, the main form's PropertyStore holds a reference to the MDI child form. I wonder whether this will cause the child form to be alive even if it is closed. If so, what shall I do when disposing the child form in order to remove this reference?

The child form is called by sample code:

//The code is in the main form.
var f = new FormMDIChild();
f.MdiParent = this;
f.Show();
See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
thumb_up_alt 0 like thumb_down_alt 0 dislike
857 views
Welcome To Ask or Share your Answers For Others

1 Answer

For the record, the solution offered in the referenced post does work (though it's a little dicey). However, the leak also goes away if you open and close another child form, it appears that the MDI Parent only leaks the last opened child.

If you want to fix the leak by using the work around mentioned in the referenced post, just override the MDIParent's OnMdiChildActivate method...

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

    typeof(Form).InvokeMember("FormerlyActiveMdiChild", 
        BindingFlags.Instance | BindingFlags.SetProperty |
        BindingFlags.NonPublic, null, this, new object[] { null });
}

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
thumb_up_alt 0 like thumb_down_alt 0 dislike
Welcome to ShenZhenJia Knowledge Sharing Community for programmer and developer-Open, Learning and Share
...