ComboBox Multibinding

Question

I'm pretty new to WPF. I'm having a problem with a ComboBox

        <ComboBox Grid.Column="2" Grid.Row="5" x:Name="ddlLocation" ItemsSource="{Binding Users.Locations}" Text="&lt;None Selected&gt;" IsEditable="True" IsReadOnly="True" SelectedValue="{Binding Users.SelectedUser.Location}">
        <ComboBox.ItemTemplate>
            <DataTemplate>
                <TextBlock>
                    <TextBlock.Text>
                        <MultiBinding StringFormat="{}{0} - {1}">
                            <Binding Path="Name" />
                            <Binding Path="ShortName" />
                        </MultiBinding>
                    </TextBlock.Text>
                </TextBlock>
            </DataTemplate>
        </ComboBox.ItemTemplate>
        <!--<ComboBox.SelectionBoxItemTemplate>
            <DataTemplate>
                <TextBlock>
                    <TextBlock.Text>
                        <MultiBinding StringFormat="{}{0} - {1}">
                            <Binding Path="Name" />
                            <Binding Path="ShortName" />
                        </MultiBinding>
                    </TextBlock.Text>
                </TextBlock>
            </DataTemplate>
        </ComboBox.SelectionBoxItemTemplate>-->
    </ComboBox>

If I do this I get the typename in the selection box. It seems like I should be able to use the SelectionBoxItemTemplate but it tells me SelectionBoxItemTemplate doesn't have an accessible setter. How would you do this?

Answer 1

Looks like this is a result of having IsEditable="True" which I would suggest removing, as you also have IsReadOnly="True"

Regarding the Text property --- a default value when nothing is selected... I'll just put this out there but am hoping someone has a better solution... I didn't see anything at a quick look online.

Include the namespace

xmlns:conv="clr-namespace:StackOverflow.Converters"

Some xaml

<ComboBox ... IsEditable="{Binding SelectedItem, RelativeSource={RelativeSource Self}, Converter={StaticResource NullBoolConverter}, FallbackValue=False}">
    <ComboBox.Resources>
        <conv:NullBoolConverter x:Key="NullBoolConverter" />
    </ComboBox.Resources>

Converter class

namespace StackOverflow.Converters
{
    class NullBoolConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            return value == null;
        }
        ....
     }
}