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AutoCompleteBox.SelectionChanged Event

Silverlight

Occurs when the selected item in the drop-down portion of the AutoCompleteBox has changed.

Namespace:  System.Windows.Controls
Assembly:  System.Windows.Controls.Input (in System.Windows.Controls.Input.dll)

public event SelectionChangedEventHandler SelectionChanged
<sdk:AutoCompleteBox SelectionChanged="eventhandler"/>

For more information about handling events, see Events Overview for Silverlight.

The following example shows how to use the ValueMemberBinding property in combination with a data template to display a data-bound date. There is a value converter associated with the binding that formats the date in a custom format. In addition, the SelectionChanged event is handled, and the details of the selected item are shown in two text block controls. This code example requires a reference to the System.Windows.Controls.Input assembly.

Run this sample


using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Windows.Data;
using System.Collections;

namespace ACBValueMemberBinding
{

    public partial class MainPage : UserControl
    {
        List<Recording> MyMusic = new List<Recording>();
        public MainPage()
        {
            InitializeComponent();

            // Add items to the collection.
            MyMusic.Add(new Recording("Chris Sells", "Chris Sells Live",
                new DateTime(2008, 3, 5)));
            MyMusic.Add(new Recording("Chris Sells", "Chris Sells",
               new DateTime(2004, 4, 6)));
            MyMusic.Add(new Recording("Luka Abrus",
                "The Road to Redmond", new DateTime(2007, 8, 3)));
            MyMusic.Add(new Recording("Luka Abrus",
                "Luka", new DateTime(2005, 12, 8)));
            MyMusic.Add(new Recording("Jim Hance",
                "The Best of Jim Hance", new DateTime(2007, 2, 6)));

            // Set the data context for the AutoCompleteBox.
            myACB.DataContext = MyMusic;
            myACB.SelectionChanged += new SelectionChangedEventHandler(myACB_SelectionChanged);
        }

        // Handle the SelectionChanged event-setting the data context for the stack panel
        // that contains the details to the selected item.
        void myACB_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
	    if (e.AddedItems.Count > 0) 
            	RecordingDetails.DataContext = e.AddedItems[0];

        }
    }

    // Simple business object.
    public class Recording
    {
        public Recording() { }
        public Recording(string artistName, string cdName, DateTime release)
        {
            Artist = artistName;
            Name = cdName;
            ReleaseDate = release;
        }
        public string Artist { get; set; }
        public string Name { get; set; }
        public DateTime ReleaseDate { get; set; }
    }

    public class ObjectFormatter : IValueConverter
    {
        // This converts the object to the string to display.
        public object Convert(object value, Type targetType, object parameter,
            System.Globalization.CultureInfo culture)
        {
            // Retrieve the format string and use it to format the value.
            string formatString = parameter as string;
            if (!string.IsNullOrEmpty(formatString))
            {
                return string.Format(culture, formatString, value);
            }

            // If the format string is null or empty, simply call ToString()
            // on the value.
            return value.ToString();
        }

        // No need to implement converting back on a one-way binding 
        public object ConvertBack(object value, Type targetType,
            object parameter, System.Globalization.CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
}



<!-- NOTE: 
  By convention, the sdk prefix indicates a URI-based XAML namespace declaration 
  for Silverlight SDK client libraries. This namespace declaration is valid for 
  Silverlight 4 only. In Silverlight 3, you must use individual XAML namespace 
  declarations for each CLR assembly and namespace combination outside the scope 
  of the default Silverlight XAML namespace. For more information, see the help 
  topic "Prefixes and Mappings for Silverlight Libraries". 
-->
<UserControl xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk" x:Class="ACBValueMemberBinding.MainPage" 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    xmlns:local="clr-namespace:ACBValueMemberBinding"
    Width="400" Height="413">
    <StackPanel x:Name="LayoutRoot" Background="White" >
    <StackPanel Orientation="Horizontal">
        <StackPanel.Resources>
        <local:ObjectFormatter x:Key="FormatConverter" />
        </StackPanel.Resources>
        <TextBlock Margin="5" Text="Enter a date:" TextWrapping="Wrap" />
            <sdk:AutoCompleteBox VerticalAlignment="Top" Margin="5" Width="170" Height="30" x:Name="myACB" 
                ItemsSource="{Binding}" 
                ValueMemberBinding="{Binding Path=ReleaseDate, Converter={StaticResource FormatConverter}, 
                ConverterParameter=\{0:d\}}" >
            <sdk:AutoCompleteBox.ItemTemplate>
                <DataTemplate>
                    <TextBlock Text="{Binding Path=ReleaseDate, Converter={StaticResource FormatConverter}, 
                    ConverterParameter=\{0:d\}}" />
                </DataTemplate>
            </sdk:AutoCompleteBox.ItemTemplate>
        </sdk:AutoCompleteBox>
    </StackPanel>
        <Rectangle Fill="DarkGray" Margin="5" Height="5" />
        <StackPanel x:Name="RecordingDetails" Margin="5" Background="Beige">
            <TextBlock FontWeight="Bold" Text="{Binding Path=Artist}" x:Name="artistTextBox" />
            <TextBlock FontStyle="Italic" Text="{Binding Path=Name}" />
        </StackPanel>
    </StackPanel>
</UserControl>


Silverlight

Supported in: 5, 4, 3

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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