Combobox Item collection manipulation from itemtemplate

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I have a combobox with an ItemTemplate:

HTML

<combobox height="26" horizontalalignment="Left" margin="318,100,0,0" x:name="CriteriosOpcoesComboChecks" verticalalignment="Top" width="26" xmlns:x="#unknown">
    <combobox.itemtemplate>
        <datatemplate>
            <stackpanel orientation="Horizontal">
                <checkbox x:name="_SELECCIONADO" ischecked="{Binding SELECCIONADO, Mode=TwoWay}" checked="_SELECCIONADO_Checked" unchecked="_SELECCIONADO_Unchecked" />
                <textblock x:name="_CAMPO_ID" text="{Binding CAMPO_ID}" visibility="Collapsed" />
                <textblock x:name="_CAMPO_COMBO" text="{Binding CAMPO_COMBO}" />
            </stackpanel>
        </datatemplate>
    </combobox.itemtemplate>
</combobox>

In both events ("_SELECCIONADO_Checked" and "_SELECCIONADO_Unchecked") I need to manipulate the Combox Item collection.

C#

private void _SELECCIONADO_Checked(object sender, RoutedEventArgs e)
        {
            CheckBox chAll = sender as CheckBox;
            List<app_get_group_by_campo_result> ItemList = new List<app_get_group_by_campo_result>();

            //Do something with the Combobox Item list.
        }</app_get_group_by_campo_result></app_get_group_by_campo_result>

The help I need is how to get the Item collection from the Combobox into the ItemList local variable in a relative manner starting on the CheckBox "chAll".

I tried to use:

C#

DependencyObject t = sender as DependencyObject;
DependencyObject p = VisualTreeHelper.GetParent(t) as DependencyObject;

But I got stuck on the DataTemplate and couldn't find a "parent" way up to the ComboBox.

Can anyone give a hint on how to get this working?

Thanks

Posted 20-Aug-11 13:39pm

Jorge J. Martins

Updated 21-Aug-11 5:26am

v3

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Simon Bang Terkildsen · Accepted Answer · 2011-08-20T13:59:00

Solution 1

I would suggest you read Understanding the Visual Tree and Logical Tree in WPF[^] to understand the difference between the logical and visual tree.

But in the case you describe here that is not needed, you can just do

C#

CriteriosOpcoesComboChecks.ItemsSource

Posted 20-Aug-11 13:59pm

Simon Bang Terkildsen

Updated 20-Aug-11 14:00pm

v2

Comments

Jorge J. Martins 20-Aug-11 20:32pm

Simon

Thanks for Your answer.
The thing is that my next step will be creating a UserControl to be used in a DataGrid and all ComboBoxes in that DataGrid would be named "CriteriosOpcoesComboChecks" and that is what I need the relative path for.
I looked at the link You suggested but Silverlight doesn't have the LogicalTreeHelper Class.

Simon Bang Terkildsen 20-Aug-11 20:41pm

Ok didn't know you used Silverlight.
You can then use the VisualTreeHelper in combination with FrameworkElement.Parent. So when VisualTreeHelper.GetParent returns null use FrameworkElement.Parent

Jorge J. Martins 20-Aug-11 21:18pm

That did the trick! Thanks.

RaisKazi 21-Aug-11 0:55am

My 5.

Jorge J. Martins · Accepted Answer · 2011-08-21T05:11:00

Here's how I did it:

C#

public object GetParentByType(string TypeOfParent, object ChildObject)
{
    string LocalTypeOfParent = "System.Windows.Controls." + TypeOfParent;
    DependencyObject SearchChildObject = ChildObject as DependencyObject;
    DependencyObject ComparingObject = VisualTreeHelper.GetParent(SearchChildObject) as DependencyObject;
    if (ComparingObject == null)
        ComparingObject = ((FrameworkElement)SearchChildObject).Parent as DependencyObject;
    if (ComparingObject.GetType().ToString() != LocalTypeOfParent)
        return GetParentByType(TypeOfParent, ComparingObject as object);
    else
        return ComparingObject as object;
}

And use it this way.
I have the Checked Event Handler on the CheckBox in the DataTemplate described on my initial question.

C#

        private void _SELECCIONADO_Checked(object sender, RoutedEventArgs e)
        {   // I know that I'm looking for a ComboBox and I have to be sure it's there

            ComboBox OQueProcuro = (ComboBox)GetParentByType("ComboBox", sender);

            //Do something with the found object.
//ToDo: Aditional code has to inserted for error handling in case that there is no object of the specified type as a parent of the current object.

        }