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Make MDI Parent open only one (same) MDI Child form

Posted on 2004-10-05
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Last Modified: 2011-09-20
hi Experts,

i want to ask How to make MDI Parent open only one (same) MDI Child form?
so it will like in VB6 where i can only open one MDI Child form...
i will need to close the opened MDI child form first if i want to open the same MDI child form again
Note: i will still be able to open different MDI child forms

thanks in advance
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Question by:Axpress
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4 Comments
 
LVL 86

Accepted Solution

by:
Mike Tomlinson earned 25 total points
ID: 12227330
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Assisted Solution

by:Éric Moreau
Éric Moreau earned 25 total points
ID: 12227569
You need to loop thouch the MDIChildren collection to find if an instance of a particular child is already loaded.

    Private Function IsChildInMemory(ByVal pChildName As String) As Boolean
        'A small method that checks to see if a particular form is currently displayed as a child form
        Dim frmChild As Form
        For Each frmChild In Me.MdiChildren
            If TypeName(frmChild).ToUpper = pChildName.ToUpper Then
                frmChild.Activate()
                Return True
            End If
        Next
        Return False
    End Function

Then you can use this code:

If Not IsChildInMemory("frmChild2") Then
    Dim frm As New frmChild2()
    With frm
        .MdiParent = Me
        .Show()
        '.Dock = DockStyle.Fill
    End With
End If
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LVL 86

Expert Comment

by:Mike Tomlinson
ID: 12228613
lol...emoreau...the link I posted is your solution.

~IM
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LVL 70

Expert Comment

by:Éric Moreau
ID: 12228946
seems that you agree with it!
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