IMultiValueConverter In Wpf:-

There may be scenorios like binding the label with FullName using FirstName and LastName propertys.So we can achieve this using  IMultiValueConverter.

->Create a User class.

public class User

 {

        public string FirstName { get; set; }

        public string LastName { get; set; }

}

->Create a MultiConverter class and implement IMultiValueConverter methods.

public class MultiConverter : IMultiValueConverter

    {

        public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture)

        {

            //Check the parameter.

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

            {

                //Return the fullname.

                return values[0] + values[1].ToString();

            }

            return null;

        }

        public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture)

        {

            throw new NotImplementedException();

        }

    }

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

<Window x:Class="WpfIMultiValueConverter.MainWindow"

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

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

        xmlns:my="clr-namespace:WpfIMultiValueConverter"

        Title="MainWindow" Height="350" Width="525" Loaded="Window_Loaded">

    <Window.Resources>

        <my:MultiConverter x:Key="multiConverter"></my:MultiConverter>

    </Window.Resources>

    <Grid>

        <ListBox Name="lstUsers">

            <ListBox.ItemTemplate>

                <DataTemplate>

                    <Grid>

                        <Grid.ColumnDefinitions>

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

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

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

                        </Grid.ColumnDefinitions>

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

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

                        <TextBlock Grid.Column="2">

                           <TextBlock.Text>

                           <!--We should use MultiBinding to work with IMultiValueConverter-->

                                                                <MultiBinding Converter="{StaticResource multiConverter}" ConverterParameter="FullName">

                                    <Binding Path="FirstName"></Binding>

                                    <Binding Path="LastName"></Binding>

                                </MultiBinding>

                               </TextBlock.Text>

                        </TextBlock>

                    </Grid>

                </DataTemplate>

            </ListBox.ItemTemplate>

        </ListBox>

    </Grid>

</Window>

->In window load event bind the listbox.

private void Window_Loaded(object sender, RoutedEventArgs e)

{

      //User list

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

      //Adding users.

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

      lstUser.Add(new User() { FirstName = "Anderson", LastName = "Andi" });

      lstUser.Add(new User() { FirstName = "Andri", LastName = "Jackson" });

      //Set the item source here.

      lstUsers.ItemsSource = lstUser;

}

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