Add and Remove controls in a WPF

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I have a wpf form where I am adding a user control when the user checks a certain radio control. If the control is unchecked then I need for the user control to be removed.

Here is what I was trying to do:

VB

Private Sub CtlRadioStacker1_rdYesChecked(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles CtlRadioStacker1.rdYesChecked
    Dim cbMaterial As New ctlComboBoxStacker
    If Me.CtlRadioStacker1.rdYes.IsChecked = True Then
        cbMaterial.Name = "cbMaterial"
        cbMaterial.Label.Content = "Material"
        StackPanelMain.Children.Add(cbMaterial)
    Else
        Dim location As Integer = StackPanelMain.FindName("cbMaterial")
        StackPanelMain.Children.RemoveAt(location)
    End If
End Sub

This code adds the control just fine, however it does not remove the control as I had expected. Not surprisingly if I toggle the radio buttons it adds additional copies of the control while never removing the last, I am aware of this and will correct it once I solve this dilemma.

Any help would be greatly appreciated.

Thanks,
Jason

Posted 2-May-11 11:45am

JasonSelf

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2 solutions

Solution 2

Here is how did. Assuming the UserControl to be added is defined in the Resources of Grid.

XML

<grid name="grid">
<grid.resources>
    <local:ausercontrol x:key="myUserControl" xmlns:x="#unknown" xmlns:local="#unknown" />
</grid.resources>
<RadioButton Margin="28,29,0,0" Name="radioButton1" Height="16" HorizontalAlignment="Left" VerticalAlignment="Top" Width="120">RadioButton</RadioButton>
<StackPanel Margin="28,81,26,28" Name="stackPanel1"/>
<RadioButton Height="16" HorizontalAlignment="Right" Margin="0,29,38,0" Name="radioButton2" VerticalAlignment="Top" Width="120">RadioButton</RadioButton>
</grid>

And in my code-behind, I did this :

C#

public class Window1
UserControl uc;
    public Window1()
    {
        InitializeComponent();
        radioButton1.Checked += new RoutedEventHandler(radioButton1_Checked);
        radioButton1.Unchecked += new RoutedEventHandler(radioButton1_Unchecked);
    }
    void radioButton1_Unchecked(object sender, RoutedEventArgs e)
    {
        stackPanel1.Children.Remove(uc);
    }
    void radioButton1_Checked(object sender, RoutedEventArgs e)
    {
        uc = (UserControl)grid.FindResource("myUserControl");
        stackPanel1.Children.Add(uc);
    }
}

I have added another radiobutton(radiobutton2) so that the unchecked event can be handled for radiobutton1.
Did this work for you?

Posted 3-May-11 4:41am

Tarun.K.S

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Fredrik Bornander · Accepted Answer · 2011-05-03T01:11:00

You should remove it in the Unchecked event instead I think.
Here's two solutions, depending on what criteria for identifying the control to remove:

VB

Private Sub RadioButton_Checked(sender As Object, e As RoutedEventArgs)

    Dim button As Button = New Button With {.Content = "Some content", .Name = "MyName"}
    theStackpanel.Children.Add(button)

End Sub

Private Sub RadioButton_UnChecked(sender As Object, e As RoutedEventArgs)

    ' Remove by control type, repeat if there can be many of the same type
    'theStackpanel.Children.Remove(theStackpanel.Children.Cast(Of UIElement).Where(Function(element) element.GetType() = GetType(Button)).First())

    ' Remove by control name
    theStackpanel.Children.Remove(theStackpanel.Children.Cast(Of FrameworkElement).Where(Function(element) element.Name = "MyName").Single())

End Sub

Hope this helps,
Fredrik Bornander