Changing the data for a ComboBox in WPF

Question

So I have a ComboBox with data in it and it works how they want:

<ComboBox Grid.Column="1" x:Name="MyComboBox" Margin="2, 0, 2, 0" 
                          ItemsSource="{Binding Path=MySamples}" DisplayMemberPath="SampleName" SelectedValue="{Binding Path=MySample}" 
                          SelectionChanged="OnComboBoxChanged" FontSize="11" FontFamily="Arial"/>

However, now they want the ItemsSource to be indexed. So it should be something like:

some #: SampleName

Is there an easy way to make this change just for the ComboBox drop down without changing the architecture? I cannot change the List itself since in other areas of the map, it's just the SampleName without the index. Thanks.

ChrisF · Accepted Answer · 2011-10-24 21:51:31Z

1

If your ItemsSource is a complex type:

public class MyClass
{
    public int Index { get; set; }
    public string Name { get; set; }
}

Then use the DisplayMemberPath property of the ComboBox to control what gets displayed. In this case you'd add:

DisplayMemberPath="SampleName"

to the ComboBox definition.

If instead you want to display both the index and name then you'll need to define an ItemTemplate for the ComboBox:

<ComboBox ....>
  <ComboBox.ItemTemplate>
    <DataTemplate>
      <StackPanel Orientation="Horizontal">
        <TextBlock Text="{Binding Index}" />
        <TextBlock Text=" : " />
        <TextBlock Text="{Binding Name}" />
      </StackPanel>
    </DataTemplate>
  </ComboBox.ItemTemplate>
</ComboBox>

edited Oct 24, 2011 at 21:51

answered Oct 24, 2011 at 21:37

ChrisF

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2 Comments

J W Over a year ago

Can I alter DisplayMemberPath on the fly to have an index associated with it as well?

ChrisF Over a year ago

@JW - do you want to display the index as well? You're question wasn't clear on that.

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