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From an MDI application - Call MDI Child form method from the Parent form?

Posted on 2007-11-26
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Last Modified: 2013-12-16
Hello,

"jaime_olivares" helped me on this question to call an MDI Parent Form method from a child form:
http://www.experts-exchange.com/Microsoft/Development/.NET/Visual_CSharp/Q_22983140.html

Now I need to call a Child Forms method from its Parent. Anyone?


Here is my solution from "jaime_olivares" in the other question:
   ((MainForm2 )this.MDIParent).AddCamerastoButton();

NOTES:
- ChildMDItestForm = my Child form
- MainForm2 = my Parent Form
- AddCamerastoButton() method is on my MainForm2 = MDI Parent method
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Comment
Question by:VirtueTech
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7 Comments
 
LVL 55

Expert Comment

by:Jaime Olivares
ID: 20354222
in a mdi application you can have many child forms, not just one, so, how do you know which to call?
0
 

Author Comment

by:VirtueTech
ID: 20354331
I tried this but I get an error:
((ChildMDItestForm)this.MdiChildren).upgradeLayoutbyXML(1);

ERROR:
Cannot convert type 'System.Windows.Forms.Form[]' to 'SW24RC_DevEx.ChildMDItestForm'

0
 

Author Comment

by:VirtueTech
ID: 20354338
Similar to your comment jaime...the error states that I need to know which child form, thus the array.

I'm using the MDI Manager from DevExpress, and where I need to call the Child form method is always on the selected/active child form.
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LVL 55

Expert Comment

by:Jaime Olivares
ID: 20354382
MdiChildren is a collection. You have to pick one.
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Author Comment

by:VirtueTech
ID: 20354394
how?
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LVL 55

Accepted Solution

by:
Jaime Olivares earned 2000 total points
ID: 20354447
ok, forget the MdiChildren collection. Use the  ActiveMdiChild property instead, but first you have to check if it is not null:

from your main form:

if (this.ActiveMdiChild != null)
{
         ((ChildMDItestForm)this.ActiveMdiChild).upgradeLayoutbyXML(1);
}

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Author Closing Comment

by:VirtueTech
ID: 31411140
Thank you Jaime! You're full of information and have been extremely helpful!
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