close wpf user control in VB.net

William EKE

Hi Everyone
I'm stuck on this issue, please help.

I created an user control named "CreateNewCase_uc" within which I created a button Close named "btnClose"

In my MainWindow, I created a Grid named "grid1" and a button Open named "btnCreateNewCase" with this code

Private Sub btnCreateNewCase_Click(sender As Object, e As RoutedEventArgs)
 
        Dim cnc As CreateNewCase_uc = New CreateNewCase_uc
        grid1.Children.Clear()
        grid1.Children.Add(cnc)
    End Sub

My question : which Code I need to Write for my bntClose button which is inside the user control to close or make disappeared the user control in VB.NET

Thanks in advance for your help.

3 Replies

Know the answer? Post it — somebody with the same question will find it here.

Vulpes12y ago
Accepted answer
Not sure about this but try:

Private Sub btnClose_Click(sender As Object, e As RoutedEventArgs)
Dim g As Grid = CType(Me.Parent, Grid)
If g.Children.Count > 0 Then
g.Children.RemoveAt(0)
End If
End Sub
Vulpes12y ago
Well, we know that the parent of your UserControl is a Grid but the Parent property of a UserControl returns a DependencyObject which is one of the ancestor classes of the Grid class.

So the first thing we need to do to get back to the Grid is to convert the DependencyObject to Grid which is what CType(Me.Parent, Grid) does.

Having done that, then a reference to the UserControl will be held in the Grid's Children collection. I noticed that you'd cleared this collection before adding the UserControl and so the latter must be held at index 0 of the Children collection even if you've added further controls to the Grid.

So, having made sure that the Children collection hasn't been cleared in the meantime (its Count property is greater than zero), we just need to remove the item at index 0 of the collection which is what g.Children.RemoveAt(0) does.
William EKE12y ago
Hi, Vulpes Sure, It works, Thanks a lot. I want to understand a little. what does the Ctype Function, and Children.Count and lastly Children.RemoveAt(i) I want to understand in order to use these Functions after, if necessary. And once again Thanks a lot