Is there any native WPF Multiselect combobox available? - wpf

Question

Even a 3rd party one will do.
Thanks

Answer 1

I'm not sure how a ComboBox would display data in this fashion, as it is designed as a single-selection Control.
Maybe you are looking for something like a ListBox or ListView with a SelectionMode of Multiple or Extended?
<ListBox SelectionMode="Multiple" />
<ListBox SelectionMode="Extended" />

Answer 2

There is no native multiselect combobox in WPF. Please check my blog for a simple hack using expression blend to achieve a multi selection on combobox.
http://jobijoy.blogspot.com/2009/02/simple-multiselect-combobox-using.html
The idea is to utilize the Multi-Selection feature of ListBox in to ComboBox by editing the control template.
But for accessing the selected items you might need to use the bellow line in the code.
((ListBox)cmbBox.Template.FindName("lstBox",cmbBox)).SelectedItems
Where cmbBox is your combobox and lstBox is the ListBox inside the controltemaplate.

Answer 3

I used an expander and filled the expander's header with the selection and the content with a list box. The list box is binded to a collection. Whenever user make a selection, I update the header to show what user has selected.

Answer 4

I found this useful information from Codeproject - ComboBoxMultiSelect
I haven't tried it myself as of yet, but would let know about my experience.

Answer 5

In case it is useful to anyone, I've made a rough and ready multi-select ComboBox.
Basically just a TextBlock with a Button, ListBox and a Popup. Easy to build upon I think.
Set to work with selections as list(of String), itemsSource as a list(of String), and raises a selectionsChanges event.
XAML: (user control with design dimensions excluded)
<Grid Margin="0,4,0,0">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="1*"/>
<ColumnDefinition Width="18"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<Border x:Name="bdr" BorderBrush="Gray" BorderThickness="1" Grid.ColumnSpan="2"/>
<TextBlock x:Name="txtValues" MinWidth="50" Background="#F0F0F0" Margin="1,1,0,1" Padding="3,1,0,1">
<TextBlock.ContextMenu><ContextMenu><MenuItem Header="Clear" Click="clearItems"/></ContextMenu></TextBlock.ContextMenu>
</TextBlock>
<Button Grid.Column="1" Click="showListBox">
<Polygon Points="0,2 12,2 6,8" Fill="Black"/>
</Button>
<Popup x:Name="pop" StaysOpen="False" Grid.ColumnSpan="2"
PlacementTarget="{Binding ElementName=bdr}" Closed="pop_Closed">
<ListBox x:Name="items" SelectionMode="Extended"
Width="{Binding ElementName=bdr,Path=ActualWidth}"/>
</Popup>
</Grid>
and code..
Public Class multiCombo
Private _itemsSource As List(Of String)
Private _selections As List(Of String)
Public Event selectionsChanges(sender As Object, e As EventArgs)
Public Property selections As List(Of String)
Get
Return _selections
End Get
Set
_selections = Value
For Each itm In items.Items
If Value.Contains(itm) Then
If Not items.SelectedItems.Contains(itm) Then items.SelectedItems.Add(itm)
Else
If items.SelectedItems.Contains(itm) Then items.SelectedItems.Remove(itm)
End If
Next
txtValues.Text = String.Empty
For Each itm In Value
If txtValues.Text.Length > 0 Then txtValues.Text += ", "
txtValues.Text += itm
Next
End Set
End Property
Public Property itemsSource As List(Of String)
Get
Return _itemsSource
End Get
Set
_itemsSource = Value
items.ItemsSource = Value
End Set
End Property
Private Sub showListBox(sender As Object, e As RoutedEventArgs)
pop.IsOpen = True
End Sub
Private Sub pop_Closed(sender As Object, e As EventArgs)
Dim changed = items.SelectedItems.Count <> selections.Count
If Not changed Then
For Each selItm In items.SelectedItems
If Not selections.Contains(selItm) Then changed = True
Next
End If
If changed Then
selections.Clear()
txtValues.Text = String.Empty
For Each selItm In items.SelectedItems
selections.Add(selItm)
If txtValues.Text.Length > 0 Then txtValues.Text += ", "
txtValues.Text += selItm
Next
RaiseEvent selectionsChanges(Me, Nothing)
End If
End Sub
Private Sub clearItems(sender As Object, e As RoutedEventArgs)
If selections.Count > 0 Then
selections.Clear()
txtValues.Text = String.Empty
items.SelectedItems.Clear()
RaiseEvent selectionsChanges(Me, Nothing)
End If
End Sub
End Class

Answer 6

Another CodeProject with detailed explanations how to create a ComboBox with multiple selectable Checkboxes:
Multi Select ComboBox in WPF