ComboBox with multi-binding as selected item?

I am trying to do the following:

Data Binding in Combobox

but with multi-binding.. which means I want more than one binding..

So I can display, for example, fullname as firstn开发者_开发知识库ame + lastname.

How can we do that ?

Thanks!

Add an ItemTemplate like this:

<ComboBox.ItemTemplate>
    <DataTemplate>
        <TextBlock>
            <TextBlock.Text>
                <MultiBinding StringFormat="{}{0}, {1}">
                    <Binding Path="LastName" />
                    <Binding Path="FirstName" />
                </MultiBinding>
            </TextBlock.Text>
        </TextBlock>
    </DataTemplate>
</ComboBox.ItemTemplate>

(StringFormat Reference)

Sidenote: In actual code i more often use Dean's method, but this is the MultiBinding way of doing things.

Do you mean something simple like this

<ComboBox>
    <ComboBox.ItemTemplate>
        <DataTemplate>
            <TextBlock>
                <Run Text="{Binding FirstName}" />
                <Run Text=" " />
                <Run Text="{Binding LastName}" />
            </TextBlock>
        </DataTemplate>
    </ComboBox.ItemTemplate>
</ComboBox>

You can create a binding as MultiBinding as follows:

<TextBlock>
  <TextBlock.Text>
    <MultiBinding Converter=" ... " ... >
      <Binding Path="FirstName" />
      <Binding Path="LastName" />
    </MultiBinding>
  </TextBlock.Text>
</TextBlock>

Create MultiBinding like this:

<Window x:Class="WpfTestApp.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:WpfTestApp="clr-namespace:WpfTestApp" Title="MainWindow" Height="350" Width="525" >
<Window.Resources>
    <WpfTestApp:ConcatenateStringsConverter x:Key="_concatenateStringsConverter" />
</Window.Resources>

<Grid x:Name="LayoutRoot" Style="{StaticResource RectangleHighlighter}">
    <ComboBox Width="200" Height="40">
        <ComboBox.Items>
            <ComboBoxItem >
                <ComboBoxItem.Content>
                    <TextBlock>
                        <TextBlock.Text>
                            <MultiBinding Converter="{StaticResource _concatenateStringsConverter}">
                                <Binding Mode="OneWay" Path="FirstName" />
                                <Binding Mode="OneWay" Path="LastName" />
                            </MultiBinding>
                        </TextBlock.Text>
                    </TextBlock>
                </ComboBoxItem.Content>
            </ComboBoxItem>
        </ComboBox.Items>
    </ComboBox>

</Grid>
</Window>

I have used MainWindowViewModel as the Window's DataContext:

public partial class MainWindow : Window
{
 public MainWindow()
    {
        InitializeComponent();
        DataContext = new MainWindowViewModel();
    }
}


public class MainWindowViewModel :INotifyPropertyChanged
{
    public MainWindowViewModel()
    {
        FirstName = "Souvik";
        LastName = "Basu";
    }


    private string _firstName;
    public string FirstName
    {
        get { return _firstName; }
        set
        {
            if (_firstName != value)
            {
                _firstName = value;
                OnPropertyChange("FirstName");
            }
        }
    }
    private string _lastName;
    public string LastName
    {
        get { return _lastName; }
        set
        {
            if (_lastName != value)
            {
                _lastName = value;
                OnPropertyChange("LastName");
            }
        }
    }

    protected void OnPropertyChange(string propertyName)
    {
        if(PropertyChanged != null)
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
    }
}

The converter concatenates the multiple binding values..

class ConcatenateStringsConverter : IMultiValueConverter
{
    public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        return values[0].ToString() + " " + values[1].ToString();
    }

    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

The example given here is almost what you need.

http://msdn.microsoft.com/en-us/library/system.windows.data.multibinding.aspx

Just swap the TextBlock for a ComboBox and bind to its SelectedItem rather than the Text property.