Binding a WPF Button CommandParameter to the Button itself in DataTemplate

问题

I have a DataTemplate that represents AppBar buttons that I declare through a collection of custom AppBarCommand objects.

  public AppBarCommand(RelayCommand command, string buttonstyle)
  {
     Command = command;
     ButtonStyle = buttonstyle;
  }

<DataTemplate>
   <Button Command="{Binding Command}"
           Style="{Binding ButtonStyle, Converter={StaticResource StringNameToStyleConverter}}"/>
</DataTemplate>

I would like to add a CommandParameter binding, but the parameter has to be the Button itself. This is so I can set the PlacementTarget of a Callisto flyout. Is this possible?

回答1:

<Button Command="{Binding Command}" 
        CommandParameter="{Binding RelativeSource={RelativeSource Self}}" />

Your Command property should be the generic version of the RelayCommand: RelayCommand<object> for instance.

回答2:

Answer like Miklós Balogh said, or you can:

<Button x:Name="MyButton" Command="{Binding Command}" CommandParameter={Binding ElementName=MyButton ... /> 

来源：https://stackoverflow.com/questions/12413985/binding-a-wpf-button-commandparameter-to-the-button-itself-in-datatemplate