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5.0

Dynamically create an object where the type is not known till runtime. VB.net 2005 Generics?

Asked by craigdev in .NET

I have the following three methods in my main MDI Parent form to handle form transitions:

Public Sub SwitchToFormAndCloseMe(ByVal sender As Form, ByVal toForm As Form)
If sender IsNot Nothing Then
sender.Close()
End If
HandleShowChild(toForm)
End Sub

Private Sub HandleShowChild(ByRef toForm As Form)
If IsChildInMemory(toForm.GetType()) Then
toForm.Show()
Else
'Need to create a new form of this type and show it
End If
End Sub

Private Function IsChildInMemory(ByVal childType As Type) As Boolean
Dim frmChild As Form
For Each frmChild In Me.MdiChildren
If frmChild.GetType() is childType Then
Me.ActivateMdiChild(frmChild)
Return True
End If
Next
Return False
End Function

Basically I need to implement the commented bit "Need to create a new form of this type and show it"

My usage of this is like:

Main.SwitchToFormAndCloseMe(Me, My.Forms.frmXXX)

I am open to better suggestion or best practices for form transitions, I don't want the main form to have to hold an instance of the the child forms. So want to dynamically create a form intance of the provided type and show it. Also should my methods be ByRef or ByVal for this? Can I acheive this with Generics? I have never used Generics except to hold a stronly typed List.

Thanks

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20091111-EE-VQP-89

Dynamically create an object where the type is not known till runtime. VB.net 2005 Generics?

Asked by craigdev in .NET

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