Question

When I make selection in ComboBox, and then type some text in TextBox, I want to have visible AutoSuggestion list of ID or FirstName or LastName (based on ComboBox Selection) that contains typed string in TextBox. Like this, now it works only for FirstName.

I have problem to somehow set dynamically binding for TextBlock.
Please Help.
Thanks in advance! Marina

I have ComboBox:

 <ComboBox Height="23" Name="cbAttrib" Width="120" Margin="0,8,0,0">
          <ComboBoxItem>ID</ComboBoxItem>
          <ComboBoxItem>FirstName</ComboBoxItem>
          <ComboBoxItem>LastName</ComboBoxItem>             
  </ComboBox>

I have TextBox:

<TextBox Name="txtSearch" TextChanged="txtAutoSuggestName_TextChanged"/>

And this ListBox:

 <ListBox Name="listBoxSuggestion" Visibility="Hidden" SelectionChanged="ListBox_SelectionChanged">
                <ListBox.ItemTemplate>
                    <DataTemplate>
                        <StackPanel Orientation="Horizontal">
                            <TextBlock DataContext="{Binding FirstName}"/>
                        </StackPanel>
                    </DataTemplate>
                </ListBox.ItemTemplate>
            </ListBox>

and in code I have this methods:

private void txtAutoSuggestName_TextChanged(object sender, TextChangedEventArgs e)
    {
        listBoxSuggestion.Items.Clear();
        if (txtSearch.Text != "")
        {
            ComboBoxItem cb = (ComboBoxItem)cbAttrib.SelectedItem;                
            Collection<Person> namelist = proxy.PersonSearch(txtSearch.Text, cb.Content.ToString());               
            if (namelist.Count > 0)
            {                   
                listBoxSuggestion.Visibility = Visibility.Visible;
                foreach (var obj in namelist)
                {
                    listBoxSuggestion.Items.Add(obj);                        
                }
            }
        }
        else
        {
            listBoxSuggestion.Visibility = Visibility.Hidden;
        }
    }

    private void ListBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        if (e.AddedItems.Count > 0)
        {
            txtSearch.Text = (e.AddedItems[0] as Person).FirstName.ToString();
            listBoxSuggestion.Visibility = System.Windows.Visibility.Hidden;
        }
    }

Answer 1

You are not binding the Text so nothing will display

You just bind the DataContext, which does nothing if there are no additional bindings which will be relative to it. Just swap that (or add Text="{Binding}" which will bind to the DataContext which is the FirstName) and if your logic is correct it should work.

(Instead of clearing and adding to Items you should just set the ItemsSource instead. listBoxSuggestion.ItemsSource = namelist;)

Edit: To make the binding work for different suggestions change the binding path to Value and make the ItemsSource a collection of some simple objects with a Value property (e.g. use LINQ and anonymous objects).