IValueConverter In Silverlight:-

While binding data the IValueConverter gives flexibility.For this we have to  implement IValueConverter and use Convert function.

->Create a User class.

public class User

 {

        public string FirstName { get; set; }

        public string LastName { get; set; }

        public int Age { get; set; }

        public string Address { get; set; }

 }

->Create a Converter class and implement IValueConverter methods.

public class Converter : IValueConverter

    {

        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)

        {

            //Check the parameter.

            if (parameter.ToString() == "Message")

            {

                //Create custom message here by using first name.

                return "Hai " + value.ToString();

            }

            else

            {

                return null;

            }

        }

        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)

        {

            throw new NotImplementedException();

        }

    }

->Add the Converter class in xaml as static resource.

<UserControl x:Class="SilverlightIValueConverter.MainPage"

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

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

    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"

    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

    mc:Ignorable="d"

    d:DesignHeight="300" d:DesignWidth="400" Loaded="UserControl_Loaded"

    xmlns:con="clr-namespace:SilverlightIValueConverter">

    <UserControl.Resources>

        <con:Converter x:Name="converter"></con:Converter>

    </UserControl.Resources>

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

        <ListBox Name="lstUsers">

            <ListBox.ItemTemplate>

                <DataTemplate>

                    <Grid>

                        <Grid.ColumnDefinitions >

                            <ColumnDefinition Width="100"></ColumnDefinition>

                            <ColumnDefinition Width="100"></ColumnDefinition>

                            <ColumnDefinition Width="100"></ColumnDefinition>

                            <ColumnDefinition Width="100"></ColumnDefinition>

                            <ColumnDefinition Width="100"></ColumnDefinition>

                        </Grid.ColumnDefinitions>

                        <TextBlock Grid.Column="0" Name="txtFirstName" Text="{Binding Path=FirstName}"></TextBlock>

                        <TextBlock Grid.Column="1" Name="txtLastName" Text="{Binding Path=LastName}"></TextBlock>

                        <TextBlock Grid.Column="2" Name="txtAge" Text="{Binding Path=Age}"></TextBlock>

                        <TextBlock Grid.Column="3" Name="txtAddress" Text="{Binding Path=Address}"></TextBlock>

                        <TextBlock Grid.Column="4" Name="txtMessage" Text="{Binding Path=FirstName,Converter={StaticResource converter},ConverterParameter=Message}"></TextBlock>

                    </Grid>

                </DataTemplate>

            </ListBox.ItemTemplate>

        </ListBox>

    </Grid>

</UserControl>

->In user control load event bind the listbox.

        private void UserControl_Loaded(object sender, RoutedEventArgs e)

        {

            //User list

            List<User> lstUser = new List<User>();

            //Adding users.

            lstUser.Add(new User() { FirstName = "David", LastName = "Jackson", Age = 23, Address = "WC" });

            lstUser.Add(new User() { FirstName = "ANDERSON", LastName = "ANDI", Age = 23, Address = "WC" });

            lstUser.Add(new User() { FirstName = "ANDRA", LastName = "Jackson", Age = 23, Address = "WC" });

            //Set the item source here.

            lstUsers.ItemsSource = lstUser;

        }

Let me know, if you have any feedback. Mail me for source code. Enjoy reading my articles…

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