c# - liant un TextBlock à la.NextSibling d'une valeur ComboBox - débordement de pile

I have a ComboBox that is currently bound to an XML file:

<ComboBox x:Name="employeeNameBox" IsReadOnly="False" HorizontalAlignment="Left" IsEditable="True" ItemsSource="{Binding Source={StaticResource People}, XPath=./Person/personName}" Text="Select Employee"/>

The employee names populate inside the combobox correctly. The next step I have is trying to bind a TextBlock to one of the sibling node of the selected employee name:

<TextBlock x:Name="employeeEmail" DataContext="{Binding ElementName=employeeNameBox,Path=SelectedValue}" Text="{Binding XPath=./Person/personEmail}" VerticalAlignment="Top" HorizontalAlignment="Left" Margin="0,5,0,0" MinWidth="120"/>

Here is the structure of the XML file:

<Person>
    <personName>John Doe</personName>
    <personEmail>someone@yahoo.com</personEmail>
    <personReports>Their reports here</personReports>
</Person>

Based on the personName selected by the ComboBox, I an trying to get the TextBlock to auto fill in the corresponding personEmail. For extra credit, the next step I will have is alos populating the personReports into a ListBox:

<ListBox Height="100" Width="100" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="0,5,0,0" ItemsSource="{Binding ElementName=employeeNameBox,Path=SelectedItem.personReports}"/>

I apprecite the help guys, still learning all the nuances to data binding a WPF.

Thanks!

By default, SelectedValue contains string of currently selected item and you can't use XPath with string as DataContext.

Try to bind DataContext to SelectedItem instead of SelectedValue. Then you can use following XPath to get following sibling element :

<TextBlock DataContext="{Binding ElementName=employeeNameBox, Path=SelectedItem}" 
            Text="{Binding XPath=./following-sibling::personEmail}"/>

I have a ComboBox that is currently bound to an XML file:

<ComboBox x:Name="employeeNameBox" IsReadOnly="False" HorizontalAlignment="Left" IsEditable="True" ItemsSource="{Binding Source={StaticResource People}, XPath=./Person/personName}" Text="Select Employee"/>

The employee names populate inside the combobox correctly. The next step I have is trying to bind a TextBlock to one of the sibling node of the selected employee name:

<TextBlock x:Name="employeeEmail" DataContext="{Binding ElementName=employeeNameBox,Path=SelectedValue}" Text="{Binding XPath=./Person/personEmail}" VerticalAlignment="Top" HorizontalAlignment="Left" Margin="0,5,0,0" MinWidth="120"/>

Here is the structure of the XML file:

<Person>
    <personName>John Doe</personName>
    <personEmail>someone@yahoo.com</personEmail>
    <personReports>Their reports here</personReports>
</Person>

Based on the personName selected by the ComboBox, I an trying to get the TextBlock to auto fill in the corresponding personEmail. For extra credit, the next step I will have is alos populating the personReports into a ListBox:

<ListBox Height="100" Width="100" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="0,5,0,0" ItemsSource="{Binding ElementName=employeeNameBox,Path=SelectedItem.personReports}"/>

I apprecite the help guys, still learning all the nuances to data binding a WPF.

Thanks!

By default, SelectedValue contains string of currently selected item and you can't use XPath with string as DataContext.

Try to bind DataContext to SelectedItem instead of SelectedValue. Then you can use following XPath to get following sibling element :

<TextBlock DataContext="{Binding ElementName=employeeNameBox, Path=SelectedItem}" 
            Text="{Binding XPath=./following-sibling::personEmail}"/>

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