Silverlight Value Converters

 

From :- http://timheuer.com/blog/archive/2008/07/30/format-data-in-silverlight-databinding-valueconverter.aspx

 

Here i just want to update only the code portion of it

<ListBox x:Name="FeedList">
        ListBox.ItemTemplate>
            <DataTemplate>
                <StackPanel Orientation="Vertical">
                    <TextBlock FontFamily="Arial" FontWeight="Bold" Foreground="Red" Text="{Binding Title.Text}" />
                    <TextBlock FontFamily="Arial" Text="{Binding PublishDate}" />
                </StackPanel>
            </DataTemplate>
        </ListBox.ItemTemplate>
   </ListBox>

 

Assume this XAML binds to SyndicationFeed.Items data coming from an RSS feed.  If we simply bind it the result would be this:

 public class Formatter : IValueConverter
    {
        #region IValueConverter Members
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
           throw new NotImplementedException();
        }
       public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
       {
           throw new NotImplementedException();
       }
       #endregion
  }

 public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
 {
     if (parameter != null)
     {
         string formatterString = parameter.ToString();
  
         if (!string.IsNullOrEmpty(formatterString))
         {
            return string.Format(culture, formatterString, value);
         }
     }
  
     return value.ToString();
 }

xmlns:converter="clr-namespace:TypeConverter_CS"

Finally the code look like this

 

1: <UserControl x:Class="TypeConverter_CS.Page"

   2:     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 

   3:     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

   4:     xmlns:converter="clr-namespace:TypeConverter_CS"

   5:     Width="400" Height="300">

   6:     <UserControl.Resources>

   7:         <
converter:Formatter x:Key="FormatConverter" />

   8:     </UserControl.Resources>

   9:     <Grid x:Name="LayoutRoot" Background="White">

  10:         <ListBox x:Name="FeedList">

  11:             <ListBox.ItemTemplate>

  12:                 <DataTemplate>

  13:                     <StackPanel Orientation="Vertical">

  14:                         <TextBlock FontFamily="Arial" FontWeight="Bold" Foreground="Red" Text="{Binding Title.Text}" />

  15:                         <TextBlock FontFamily="Arial" Text="{Binding PublishDate, Converter={StaticResource FormatConverter}, ConverterParameter=\{0:M\}}" />

  16:                     </StackPanel>

  17:                 </DataTemplate>

  18:             </ListBox.ItemTemplate>

  19:         </ListBox>

  20:     </Grid>

  21: </UserControl>

Output