How can i get the selected items names of multi selection mode list box

Question

I have a list box of multiple selection mode and i have to get the selected items to a string array. I want to get all the account ids that checked by the user. How can i get the items selected by the user?

XML

<ListBox Background="Transparent" Canvas.Left="18" Canvas.Top="74" Height="183" Name="listBoxAccountType" SelectionChanged="listBoxAccountType_SelectionChanged" SelectionMode="Multiple" Width="390" Visibility="Collapsed">
    <ListBox.ItemTemplate>
        <DataTemplate>
            <Border BorderThickness="0,1,0,0" BorderBrush="#FFC1BCBC" Width="490">
                <Grid Height="80">
                    <CheckBox IsChecked="{Binding IsChecked}" Checked="CheckBox_Checked" Margin="0,0,0,0" Unchecked="CheckBox_Unchecked" BorderBrush="Black" Background="#FF3BB9FF" />
                    <TextBlock FontSize="20" FontWeight="Bold" Foreground="Black" Margin="50,12,0,0" Name="tbSelectedAccountType" Text="{Binding}" />
                </Grid>
            </Border>
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

Account.cs

[DataContract]
public class Accounts
{
    public Accounts() { }

    public Accounts(int accid, int clid)
    {
        this.accountId = accid;
        this.clientId = clid;
    }
    public bool IsChecked
    {
        get;
        set;
    }

    // [DataMember(Name = "accountId")]
    [DataMember]
    public int accountId
    { get; set; }

    //[DataMember(Name = "clientId")]
    [DataMember]
    public int clientId
    { get; set; }
}

xaml.cs

private void listBoxAccountType_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    if (listBoxAccountType.SelectedIndex >= 0)
    {
        canvasType.Visibility = Visibility.Collapsed;
        canvas_Mask.Visibility = Visibility.Collapsed;
        string text = "";
        foreach (var item in listBoxAccountType.SelectedItems)
        {

            text += item.ToString() + " ";
        }
        Console.WriteLine(text);
        textBoxAccounts.Text = objAccountsName[listBoxAccountType.SelectedIndex];
        Accounts objAccounts = (Application.Current as App).m_objAccounts[listBoxAccountType.SelectedIndex];
        strAccountId = objAccounts.accountId.ToString();
    }
}

private void CheckBox_Unchecked(object sender, RoutedEventArgs e)
{
    ListBoxItem checkedItem = this.listBoxAccountType.ItemContainerGenerator.ContainerFromItem((sender as CheckBox).DataContext) as ListBoxItem;
    if (checkedItem != null)
    {
        checkedItem.IsSelected = true;
    }
}

private void CheckBox_Checked(object sender, RoutedEventArgs e)
{
    ListBoxItem checkedItem = this.listBoxAccountType.ItemContainerGenerator.ContainerFromItem((sender as CheckBox).DataContext) as ListBoxItem;
    if (checkedItem != null)
    {
       // Accounts obj = checkedItem.it;
        checkedItem.IsSelected = false;
    }
}

Claus Jørgensen Claus Jørgensen · Accepted Answer · 2011-09-16T13:19:50

Ditch your custom Checked event handling (ie. remove the CheckBox_Checked method). It's not necessary, since you use DataBinding for the Checked property.

To get the checked elements, simply filter the elements out from your bound datasource, where IsChecked is true.

However, by the looks if it, you aren't using proper databindings for the list, and I would strongly suggest you read up about that topic

For filtering out the elements, LINQ is your best friend:

var checkedItems = myItems.Where(i => i.Checked == true)

How can i get the selected items names of multi selection mode list box

1 Answers