Binding to viewmodel from inside a datatemplate

Question

I have multiple videos displayed they are bound with a videocollection in Mainviewmodel. Everything works fine untill I try to bind the enter command to Mainviewmodel. I Don't know the syntax for this. As it stands the binding is set to Video and not Mainviewmodel.

Errormessage:

'StartVideoCommand' property not found on 'object' ''Video'

Xaml:

<Window.Resources> <local:MainViewModel x:Key="MainViewModel"/> </Window.Resources> <Grid DataContext="{StaticResource MainViewModel}"> <ListBox ItemsSource="{Binding Videos}"> <ListBox.ItemTemplate> <DataTemplate> <Grid> <Grid.InputBindings> !!! <KeyBinding Key="Enter" Command="{Binding StartVideo}" /> !Bound to Video not to Mainviewmodel grrr </Grid.InputBindings> ... layout stuff <TextBlock Text="{Binding Title}" Grid.Column="0" Grid.Row="0" Foreground="White"/> <TextBlock Text="{Binding Date}" Grid.Column="0" Grid.Row="1" Foreground="White" HorizontalAlignment="Left"/> <TextBlock Text="{Binding Length}" Grid.Column="1" Grid.Row="1" Foreground="White" HorizontalAlignment="Right"/> ... closing tags

Does this answer your question? WPF Databinding: How do I access the "parent" data context? — StayOnTarget
– StayOnTarget, Commented Mar 3, 2021 at 14:04

Jeroen · Accepted Answer · 2013-08-23 00:02:28Z

49

Command="{Binding RelativeSource={RelativeSource AncestorType={x:Type Window}}, Path=DataContext.StartVideo}"

answered Aug 23, 2013 at 0:02

Jeroen

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1 Comment

Tono Nam Over a year ago

I had to bind to a command therefore I did:

Command="{Binding RelativeSource={RelativeSource AncestorType={x:Type UserControl}}, Path=DataContext.COMMAND_I_WANT_TO_BIND_TO}"

StayOnTarget · Accepted Answer · 2020-06-02 11:29:35Z

Another approach would be to use ElementName binding instead of RelativeSource.

Example:

<Window x:Name="root" ... > ... Command="{Binding ElementName=root, Path=DataContext.StartVideo}" ...

A possible advantage over RelativeSource is that this is explicit; if someone changes the XAML hierarchy then relative references could break unintentionally. (Not likely in this specific example of binding to a Window however).

Also if your "root" element already is named then so much the better it is easy to take advantage of.

It is also somewhat more readable.

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