Format a Phone number using StringFormat in xaml

Question

Hello,
I am looking to format a Phone Number in xaml. The Phone Number comes as a string to me.
<Label Content="{Binding SelectedPatientPolicy.CarrierPhoneNumber}" Grid.Row="5" Grid.Column="1" Grid.ColumnSpan="2" Style="{StaticResource FieldValueStyle}"/>
Here I want to apply StringFormat as "(###) ###-####".
Please let me know how can i achieve this.
Thanks,
Abdi

Answer 1

You cannot apply a StringFormat on a string value in XAML. But you could use a converter class:
namespace WpfApplication24_4
public class StringToPhoneConverter : IValueConverter
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
string s = value as string;
if (string.IsNullOrEmpty(s) || s.Length < 10)
return value;
return string.Format("({0}) {1}-{2}", s.Substring(0,3), s.Substring(3,3), s.Substring(6,4)); //"(###) ###-####".
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
throw new NotImplementedException();
<Window x:Class="WpfApplication24_4.Window5"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:WpfApplication24_4"
Title="Window5" Height="300" Width="300">
<Window.Resources>
<local:StringToPhoneConverter x:Key="conv"/>
</Window.Resources>
<Grid>
<Label Content="{Binding SelectedPatientPolicy.CarrierPhoneNumber, Converter={StaticResource conv}}" Grid.Row="5" Grid.Column="1" Grid.ColumnSpan="2" Style="{StaticResource FieldValueStyle}"/>
</Grid>
</Window>
The other option is to format the value of the source property directly. You cannot do this in the XAML markup anyway.
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