IsMdiContainer

[CLRBOY]

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

[Wile]

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();

}

 

 

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;

[CLRBOY]

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)

[PlausiblyDamp]

MainForm s = new MainForm();

is creating a new instance of the MainForm, not refering to the existing one.

This is probably worth a read.

[CLRBOY]

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