Finding a control inside another control in WPF

Question

Since there is no link button in WPF I created a link button using hyperlink and text block controls.

There are 3 controls:

<TextBlock  Grid.Column="0" VerticalAlignment="Center" HorizontalAlignment="Left"  >                
     <Hyperlink Name="hyplnkIsActiveMarkets"  Click="hyplnkIsActive_Click" Foreground="Blue"  >  
         <TextBlock Name="txtblkIsActiveMarkets" Text="Active"  />     
     </Hyperlink>
 </TextBlock>
 <TextBlock  Grid.Column="1" VerticalAlignment="Center" HorizontalAlignment="Left">                
     <Hyperlink Name="hyplnkIsActiveBudgets"  Click="hyplnkIsActive_Click" Foreground="Blue"  >  
         <TextBlock Name="txtblkIsActiveBudgets"  Text="Active"  />     
     </Hyperlink>
</TextBlock>
<TextBlock  Grid.Column="2" VerticalAlignment="Center" HorizontalAlignment="Left">                
     <Hyperlink Name="hyplnkIsActivePrograms"  Click="hyplnkIsActive_Click" Foreground="Blue"  >  
         <TextBlock Name="txtblkIsActivePrograms"  Text="Active"  />     
     </Hyperlink>
</TextBlock>

All the link buttons calls same click method

private void hyplnkIsActive_Click(object sender, RoutedEventArgs e)
{
    Hyperlink objHyperlink = (Hyperlink)sender;
    TextBlock objTextBlock = new TextBlock();

    if (objHyperlink == hyplnkIsActiveMarkets)
    {
        objTextBlock = txtblkIsActiveMarkets;
    }
    else if (objHyperlink == hyplnkIsActiveBudgets)
    {
        objTextBlock = txtblkIsActiveBudgets;
    }
    else if (objHyperlink == hyplnkIsActivePrograms)
    {
        objTextBlock = txtblkIsActivePrograms;
    }

    if (objTextBlock.Text == "Active")
        ChangeHyperLinkStatus(objHyperlink, objTextBlock, Status.Inactive);
    else ChangeHyperLinkStatus(objHyperlink, objTextBlock, Status.Active);
}

In the click method I check for the text block inside the hyper link individually using if condition.

Is there any easier way to do this? That's basically finding control inside a control?

This might help you: [WPF ways to find controls @ SO](http://stackoverflow.com/questions/636383/wpf-ways-to-find-controls). — Michał Powaga, Dec 30 '11 at 06:43
foreach (Control control in parent.Controls){ } within the brackets do your type checking and or casting — MethodMan, Dec 30 '11 at 06:48

Maheep · Answer 1 · 2011-12-30T07:03:39.730

2

UPDATE: you can not use VisualTreeHelper.GetParent(...) to get the parent of your hyperlink as you have mentioned hyperlink is not visual. corrected the answer.

See code below.

private void hyplnkIsActive_Click(object sender, RoutedEventArgs e)
{
    Hyperlink objHyperlink = (Hyperlink)sender;
    TextBlock objTextBlock  = (TextBlock)LogicalTreeHelper.GetChildren(objHyperlink)[0]; 
   // This will give logical tree first child of objHyperlink


    if (objTextBlock.Text == "Active")
        ChangeHyperLinkStatus(objHyperlink, objTextBlock, Status.Inactive);
    else 
        ChangeHyperLinkStatus(objHyperlink, objTextBlock, Status.Active);
}

See this article about logical tree on MSDN

edited Dec 30 '11 at 07:03

answered Dec 30 '11 at 06:43

Maheep

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I am getting exception "'System.Windows.Documents.Hyperlink' is not a Visual or Visual3D." – Kuntady Nithesh Dec 30 '11 at 06:49
I am not finding parent of Hyperlink , i want the child inside Hyperlink. but i am not finding child option . – Kuntady Nithesh Dec 30 '11 at 07:01
Isn't he asking about `TextBlock` that is child of the `Hyperlink`? – Piotr Auguscik Dec 30 '11 at 07:01
Piotr is right . How can find child . I am not getting any option. – Kuntady Nithesh Dec 30 '11 at 07:04
Yes. Updated the answer for getting the child instead of parent. – Maheep Dec 30 '11 at 07:04
cannot do this it gives error "cannot add indexing to a type Ienumerable" – Kuntady Nithesh Dec 30 '11 at 07:15
Then remove [0] and get first child by iterating the IEnumrable – Maheep Dec 30 '11 at 07:20

score 1 · Answer 2 · answered Dec 30 '11 at 08:49

I think you're going into the wrong direction by relaying your execution logic on controls and not on data.

You can, for example, bind a ICommand or RelayCommand to the buttons, or just subscribe different events, or define a custom DataTemplate where on mouse down the clicked control is assignable to some ModelView property.

Doing in way you do, you create tough coupling between UI and your execution logic. In this case easier use WindowsForm then WPF.

score 0 · Accepted Answer · answered Dec 30 '11 at 09:30

0

I got it finally . Thanks to Maheep fa his help

 TextBlock objTextBlock = (TextBlock)LogicalTreeHelper.GetChildren(objHyperlink).Cast<System.Windows.Documents.InlineUIContainer>().FirstOrDefault().Child;

answered Dec 30 '11 at 09:30

Kuntady Nithesh

11,371
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Finding a control inside another control in WPF

3 Answers3