How to properly bind datacontext RelativeSource in WPF?

Question

I am defining the RelativeSource in my Template in the XAML, with

DataContext="{Binding RelativeSource={RelativeSource Self}}"

I am getting an exception

"A first chance exception of type 'System.Windows.Markup.XamlParseException' occurred in PresentationFramework.dll

Additional information: Provide value on 'System.Windows.Markup.StaticResourceHolder' threw an exception."

I think the problem is i need to bind this after my Window.Resources declarations but i am not sure how to do this using the <DataContext tags and still use RelativeSource. Thanks!

<Window x:Class="SupportDesk.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Top Echelon Support Desk" Height="554" Width="743" xmlns:my="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Input.Toolkit" xmlns:myNewNamespace="clr-namespace:SupportDesk"
    DataContext="{Binding RelativeSource={RelativeSource Self}}">
<Window.Resources>
    <myNewNamespace:BoolToVisibilityConverter x:Key="boolToVis" />

    <Style TargetType="{x:Type TextBlock}"
  x:Key="GridBlockStyle">
        <Setter Property="VerticalAlignment" Value="Center" />
        <Setter Property="Visibility"
 Value="{Binding Path=IsSelected,
     RelativeSource={RelativeSource FindAncestor,
         AncestorType={x:Type ListViewItem}},
     Converter={StaticResource boolToVis},
         ConverterParameter=False}" />
    </Style>
</Window.Resources>

I thin you are going to have to give more details. Can you provide a few snippets of code? — ColinE
– ColinE, Commented Dec 22, 2010 at 13:44
just from researching online i think the reason the exception is occurring is because of the RelativeSource declaration is before my Window.Resources section. but every where i have looked the Relative source is always bound to specific elements, whereas i have three autocompleteboxes i am using from the WPF Toolkit, that reference this. i would like to delcare this using the datacontext tags but i dont think this is possible. — Drew
– Drew, Commented Dec 22, 2010 at 13:58

ColinE · Accepted Answer · 2010-12-22 13:57:16Z

3

How about setting the DataContext on the immediate child of your window? e.g.

<Window>
   <Grid DataContext="{Binding RelativeSource={RelativeSource Self}}">
   </Grid>
</Window>

Would this work for you?

answered Dec 22, 2010 at 13:57

ColinE

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5 Comments

Drew Over a year ago

thanks for helping with this. the exception is gone when i do that however now no data is returning in my listview. basically i have three autocomplete boxes, and when a value is selected i run a query and return results in a listview. the data is no longer being returned

ColinE Over a year ago

Time to do a bit of debugging! ... i you set a breakpoints, what is the DataContext for the listview? for the Grid? ...

ColinE Over a year ago

Also ... why are you using a relative source self binding? Typically this is used for UI controls, not windows / forms.

Drew Over a year ago

i am not really sure. what should i be using?

Drew Over a year ago

well either way it was working until my recent problem which stemmed from my trying allow for editing a field in the listview. thanks for the suggestion, ill figure it out ...

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