Question

I would like to dynamic do the columnSpan on the userControl. I created the converter class, but it didn’t work. Would you show me how to do it correctly? Thanks.

The code on my UserControl:

<TextBlock  x:Name="txtSumary" Grid.Row="0" Grid.Column="1" Text="{Binding summary}"           
   TextWrapping="Wrap"  Style="{StaticResource PhoneTextAccentStyle}" Grid.ColumnSpan="{Binding isSpan, Converter={StaticResource ColumSpanConverter}}"  />

It is reference on the UserControl.Resources

<local:VisibilityConverter x:Key="ColumSpanConverter"/>

There is the Converter Class:

 public class ColumSpanConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {          
        bool isSpan = (bool)value;
        return isSpan ? 2 : 0;
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        throw new NotSupportedException();
    }
}

Answer 1

The converter is referencing the wrong converter:

<local:VisibilityConverter x:Key="ColumSpanConverter"/>

Should be:

<local:ColumSpanConverter x:Key="ColumSpanConverter" />