IsMdiContainer

C

CLRBOY

Newcomer
Joined
Dec 15, 2004
Messages
11
Hi everybody
I'm new with programming & VS.Net so i have many many questions...


I have a MainForm that is "IsMdiContainer=true" and another Form with three buttons, each button opens different forms(lets say form3,form4,form5). when any button is clicked i need to close the form(with the three buttons) and open form3 (or form4/form5).

The problem is that when i try to open form3/4/5 ,VS (in my fault) actually
try to open it within the form with the three buttons (althought i close it)
and got an exception ("The form that was specified to be the MdiParent for this form is not an MdiContainer").

private void button1_Click(object sender, System.EventArgs e)
{
this.Close();
MainForm s = new MainForm();
s.MdiParent = this.MdiParent;
Form3 InnerWindow = new Form3();
InnerWindow.MdiParent = this;
InnerWindow.Show();
}

i looked here but it didn't help me (i'm new with programming......)

http://www.xtremedotnettalk.com/showthread.php?t=85215
 
CLRBOY said:
an exception ("The form that was specified to be the MdiParent for this form is not an MdiContainer").

private void button1_Click(object sender, System.EventArgs e)
{
this.Close();
MainForm s = new MainForm();
s.MdiParent = this.MdiParent;
Form3 InnerWindow = new Form3();
InnerWindow.MdiParent = this;
InnerWindow.Show();
}
Click to expand...

If the line I made bold, is the line of code that throws the exception, you are setting the wrong MdiParent. A few lines above you set s.MdiParent to this.MdiParent. So MainForm s is already a child in another mdi container.
I'm not sure, but I remember from an old VB (vb5 I think) book, that it was not possible to nest mdi containers -> you can't have an mdi container inside another mdi container. I dont know if that restriction still exists but it wouldnt surprise me much.

If you dont want to use nested mdi containers, just use InnerWindow.MdiParent = this.MdiParent;
 
private void button1_Click(object sender, System.EventArgs e)
{
this.Close();
MainForm s = new MainForm();
Form3 InnerWindow = new Form3();
InnerWindow.MdiParent = s.MdiParent;
InnerWindow.Show();
}

now what happens is that form3 doesn't open inside the container....

the same is happens if i write:

this.Close();
Form3 InnerWindow = new Form3();
InnerWindow.Show();

i can't understand how to set the parent.....(MainForm)
 
ok...i got it....

(when i'm inside the first child)

Form3 InnerWindow = new Form3();
InnerWindow.MdiParent = this.ParentForm;
InnerWindow.Show();
this.Close();

and now it works fine.. :rolleyes:

10x to all
 
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