MultiBinding WPF Example

WPF > Windows > Data > MultiBinding

Represents a collection of Binding objects attached to a single binding target property.

Example

XAML

<Window x:Class="WpfApplication4.MainWindow"

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

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

        Title="MainWindow" Height="350" Width="525"

        xmlns:local="clr-namespace:WpfApplication4">

    <Window.Resources>

        <local:NameConvertor x:Key="nameConvertor"></local:NameConvertor>

    </Window.Resources>

    <Grid>

        <Grid>

            <TextBlock HorizontalAlignment="Left" Margin="20,30,0,0" TextWrapping="Wrap" Text="First Name" VerticalAlignment="Top"/>

            <TextBox x:Name="txtFirstName" HorizontalAlignment="Left" Height="23" Margin="86,27,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="120"/>

            <TextBlock HorizontalAlignment="Left" Margin="20,68,0,0" TextWrapping="Wrap" Text="Last Name" VerticalAlignment="Top"/>

            <TextBox x:Name="txtLastName" HorizontalAlignment="Left" Height="23" Margin="86,65,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="120"/>

            <TextBlock HorizontalAlignment="Left" Margin="20,110,0,0" TextWrapping="Wrap" Text="Full Name" VerticalAlignment="Top"/>

            <TextBox x:Name="txtLastName_Copy" HorizontalAlignment="Left" Height="23" Margin="86,107,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="267">

                <TextBox.Text>

                    <MultiBinding Converter="{StaticResource nameConvertor}" UpdateSourceTrigger="PropertyChanged">

                        <Binding ElementName="txtFirstName" Path="Text" />

                        <Binding ElementName="txtLastName" Path="Text" />

                    </MultiBinding>

                </TextBox.Text>

            </TextBox>

        </Grid>

    </Grid>

</Window>

C#

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Data;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Imaging;

using System.Windows.Navigation;

using System.Windows.Shapes;

namespace WpfApplication4

{

    public class NameConvertor : IMultiValueConverter

    {

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

        {

            return String.Concat(values[0], ",", values[1]);

        }

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

        {

            return (value as string).Split(',');

        }

    }

    /// <summary>

    /// Interaction logic for MainWindow.xaml

    /// </summary>

    public partial class MainWindow : Window

    {

        public MainWindow()

        {

            InitializeComponent();

        }

    }

}