CODEWITHSUNDEEP
c#mdichildmdiparent
NexAddo
NexAddo

Reputation: 772

MDI Child Forms C#

How do you check for a close event for an MDI child form when clicking the "X" button and let the parent form know that it has closed?

Upvotes: 0

Views: 1898

Answers (4)

Glory Raj
Glory Raj

Reputation: 17701

well, The below code shows how parent form recognises whether the child form has been closed or not and it can also recognises that is there any new child form is added to that parent form..

private List<Form> ChildFormList = new List<Form>();

private void MyForm_MdiChildActivate(object sender, EventArgs e)
{
   Form f = this.ActiveMdiChild;

   if (f == null)
   {
    //the last child form was just closed
    return;
   }

   if (!ChildFormList.Contains(f))
   {
      //a new child form was created
      ChildFormList.Add(f);
      f.FormClosed += new FormClosedEventHandler(ChildFormClosed); // here the parent form knows that that child form has been closed or not
  }
  else
  {
    //activated existing form
  }
}
private void ChildFormClosed(object sender, FormClosedEventArgs e)
{
   //a child form was closed
    Form f = (Form)sender;
    ChildFormList.Remove(f);
}

Upvotes: 0

juFo
juFo

Reputation: 18577

Attach a closed event to the childform from within the mainForm

Form mdiChild = new Form();
mdiChild.MdiParent = this;
mdiChild.Closed += (s, e) => { //... };
mdiChild.Show();

didn't check the code but should not be that hard

Upvotes: 0

Jonas Elfstr&#246;m
Jonas Elfstr&#246;m

Reputation: 31448

You can simply listen to the FormClosed event in the MDI.

var childForm = new ChildForm();
childForm.FormClosed += new FormClosedEventHandler(form_FormClosed);
childForm.Show();

Upvotes: 4

Orn Kristjansson
Orn Kristjansson

Reputation: 3485

In the form FormClosing event you can do 

TheMainForm form = (TheMainForm)this.MdiParent()
form.AlertMe( this );

Upvotes: 0

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