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Thursday, June 12, 2014

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();
        }
    }
}