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How to get select value from listbox / Silverligh4

Posted on 2010-09-14
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Last Modified: 2013-11-12
How  can I get the selected value from listbox.
I tried listBox1.SelectedItem, listBox1.SelectedValue, but it is not the right way.
Thanks.


 <ListBox Height="100" HorizontalAlignment="Left" Margin="21,266,0,0"      Name="listBox1" VerticalAlignment="Top" Width="556">
            <ListBoxItem Content="One" />
            <ListBoxItem Content="Two" />
            <ListBoxItem Content="Three" IsEnabled="False" />
        </ListBox>

 private void listBox1_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            var x = listBox1.SelectedItem;
            var y = listBox1.SelectedValue;
        }

0
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Question by:Plexo
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7 Comments
 
LVL 9

Expert Comment

by:TonyReba
ID: 33678764
What Error is it giving? What is displayed?
0
 
LVL 10

Expert Comment

by:joriszwaenepoel
ID: 33679364
I'm not sure, but maybe this could work:

var x = DirectCast(listBox1.SelectedItem, ListBoxItem).Content.ToString();
0
 
LVL 29

Expert Comment

by:Gautham Janardhan
ID: 33679994
see a sample to for the WPF list box.
as far as possible everything should be done using bindings in WPF/Silverlight.
<ListBox ItemsSource="{Binding ListBoxItems}" SelectedItem="{Binding SelectedItem}" SelectionChanged="ListBox_SelectionChanged">
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <TextBlock Text="{Binding Content}"/>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>

// code behind

public partial class Window2 : Window
    {
        DataContext context;
        public Window2()
        {
            InitializeComponent();
            context = new DataContext();
            this.DataContext = context;
        }

        private void ListBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            MessageBox.Show("Selected item is : " + context.SelectedItem.Content);
        }
    }

    public class DataContext
    {
        public ObservableCollection<Item> ListBoxItems { get; set; }
        public Item SelectedItem { get; set; }
        public DataContext()
        {
            ListBoxItems = new ObservableCollection<Item>();
            ListBoxItems.Add(new Item()
            {
                Content = "Test 1"
            });

            ListBoxItems.Add(new Item()
            {
                Content = "Test 2"
            });

            ListBoxItems.Add(new Item()
            {
                Content = "Test 3"
            });

            ListBoxItems.Add(new Item()
            {
                Content = "Test 4"
            });
        }
    }

    public class Item
    {
        public string Content { get; set; }
    }

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Author Comment

by:Plexo
ID: 33683929
Hi TonyReba
There's no mistake, I just can not get the contents.
Thanks.
0
 

Author Comment

by:Plexo
ID: 33683988
Hi joriszwaenepoel

var x = DirectCast(listBox1.SelectedItem, ListBoxItem).Content.ToString();
I used your code and I had the following error:

Error      1      The name 'DirectCast' does not exist in the current context
Error      2      'System.Windows.Controls.ListBoxItem' is a 'type' but is used like a 'variable'
0
 
LVL 9

Expert Comment

by:TonyReba
ID: 33684466
I'm not too good on c# but try, .        

Dim x as listboxitem = ctype (listbox1.selectedvalue, listboxitem).tostring()

 Then use x as your variable.

Note Google telerik code converter if u need convert to c #  this is vb                          
0
 
LVL 29

Accepted Solution

by:
Gautham Janardhan earned 500 total points
ID: 33685100
in C# that would be

((ListBoxItem)listBox1.SelectedItem).Content.Tostring()
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