I want to build a RowStyle
which changes the Visibility
of the Rows, depending on two conditions (OR).
Per default all Rows should be collapsed an be visible whether a Boolean (in ViewModel) is set to True
OR a value in the DataTable
, bound to the Datagrid
, equals to the current User. So, the current user is, of course, a Property too.
<DataGrid.RowStyle>
<Style TargetType="{x:Type DataGridRow}">
<Setter Property="Visibility" Value="Collapsed" />
<Style.Triggers>
<DataTrigger Binding="{Binding RelativeSource={RelativeSource AncestorType={x:Type Window},Mode=FindAncestor},Path=DataContext.ColleaguesVisible}" Value="True">
<Setter Property="Visibility" Value="Visible" />
</DataTrigger>
<DataTrigger Binding="{Binding CreatingUser}" Value="{Binding CurrentStaffMember}">
<Setter Property="Visibility" Value="Visible" />
</DataTrigger>
</Style.Triggers>
</Style>
</DataGrid.RowStyle>
But at the Value Binding there's the error...
I already searched around, but I couldn't find a solution for this problem.
I hope someone can help me.
You can't bind the Value
property to a DataTrigger
to something because it is not a dependency property.
What you could do is to use a converter:
<DataGrid ... x:Name="dgr" xmlns:local="clr-namespace:WpfApp2">
<DataGrid.Resources>
<local:Converter x:Key="conv" />
</DataGrid.Resources>
<DataGrid.RowStyle>
<Style TargetType="{x:Type DataGridRow}">
<Setter Property="Visibility" Value="Collapsed" />
<Style.Triggers>
<DataTrigger Binding="{Binding RelativeSource={RelativeSource AncestorType={x:Type Window},Mode=FindAncestor},Path=DataContext.ColleaguesVisible}" Value="True">
<Setter Property="Visibility" Value="Visible" />
</DataTrigger>
<DataTrigger Binding="{Binding Path=., Converter={StaticResource conv}}" Value="True">
<Setter Property="Visibility" Value="Visible" />
</DataTrigger>
</Style.Triggers>
</Style>
</DataGrid.RowStyle>
</DataGrid>
namespace WpfApp2
{
public class Converter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
DataRowView drv = value as DataRowView;
if(drv != null)
{
return drv["CreatingUser"].ToString() == drv["CurrentStaffMember"].ToString();
}
return false;
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
}
}
Where does 'CreatingUser' sits? in row DataContext(your item), or in ViewModel Behind DataGrid, Or in ViewModel behind Window?
maybe thats your problem?