Databinding for editable tree view

[califax2k]

Hi, my problem is the following: I am binding a data structure to a tree view and I want to edit elements of this data structure. But when a TreeViewItem has been selected the TextBox doesn't contain the Name (that's the part of the data element that is to be changed) but its empty. The data elements look like this:

public class PiList
    : INotifyPropertyChanged
{

    private string m\_name;
    // This is the one that is to be changed.
    public string Name
    {
        get
        {
            return m\_name;
        }
        set
        {
            m\_name = value;
            OnPropertyChanged("Name");
        }
    }

    private readonly ObservableCollection \_children = new ObservableCollection();
    public ObservableCollection Children
    {
        get
        {
            return \_children;
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;
    void OnPropertyChanged(string name)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(name));
        }
    }
}

For this data structure I have the following data template:

<HierarchicalDataTemplate DataType="{x:Type local:PiList}" ItemsSource="{Binding Path=Children}">
<ContentControl Content="{Binding Name}" Style="{StaticResource EditableContentControl}"/>
</HierarchicalDataTemplate>

This template applies the style EditableContentControl to the ContentControl. This style is defined like this:

<Style x:Key="EditableContentControl" TargetType="{x:Type ContentControl}">

<Setter Property="ContentTemplate">
    <Setter.Value>
        <DataTemplate DataType="{x:Type local:PiList}">
            <TextBlock Text="{Binding Path=Name}" />
        </DataTemplate>
    </Setter.Value>
</Setter>

<Style.Triggers>
    <DataTrigger Binding="{Binding Path=IsSelected,RelativeSource={RelativeSource AncestorType={x:Type TreeViewItem}}}"
                 Value="True">
        <Setter Property="ContentTemplate">
            <Setter.Value>
                <DataTemplate DataType="{x:Type local:PiLis

[califax2k]

Further investigation: also setting the data context of the treeview to make the bindings refer implicitly to this data context didn't help :confused:

#pragma error( disable : * )

[Mark Salsbery]

Try changing your hierarchical data template to

<HierarchicalDataTemplate DataType="{x:Type local:PiList}" ItemsSource="{Binding Path=Children}">
    <ContentControl `Content="{Binding}"` Style="{StaticResource EditableContentControl}" />
</HierarchicalDataTemplate>

Mark Salsbery Microsoft MVP - Visual C++ :java:

[califax2k]

You're so cool, Thanks a lot ;-)

#pragma error( disable : * )